Form 10-Q - Quarterly report [Sections 13 or 15(d)]

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2024

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 000-31615

DURECT CORPORATION

(Exact name of registrant as specified in its charter)

    Delaware

    94-3297098

    (State or other jurisdiction of
incorporation or organization)

    (I.R.S. Employer
Identification No.)

10240 Bubb Road

Cupertino, California 95014

(Address of principal executive offices, including zip code)

(408) 777-1417

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

    Title of Each Class

    Trading Symbol

    Name of Each Exchange on Which Registered

    Common Stock $0.0001 par value per share
 
    DRRX

    The NASDAQ Stock Market LLC
(The Nasdaq Capital Market)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.


Large accelerated filer	☐	Accelerated filer	☐
Non-accelerated filer	☒	Smaller reporting company	☒
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of May 9, 2024, there were 31,039,381 shares of the registrant’s common stock outstanding.

INDEX


		Page

	PART I. FINANCIAL INFORMATION

Item 1.	Financial Statements	5

	Condensed Balance Sheets as of March 31, 2024 and December 31, 2023	5

	Condensed Statements of Operations and Comprehensive Loss for the three months ended March 31, 2024 and 2023	6

	Condensed Statements of Stockholders’ Equity for the three months ended March 31, 2024 and 2023	7

	Condensed Statements of Cash Flows for the three months ended March 31, 2024 and 2023	8

	Notes to Condensed Financial Statements	9

Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	23

Item 3.	Quantitative and Qualitative Disclosures about Market Risk	29

Item 4.	Controls and Procedures	29

	PART II. OTHER INFORMATION

Item 1.	Legal Proceedings	30

Item 1A.	Risk Factors	30

Item 5.	Other Information	31

Item 6.	Exhibits	32

Signatures		33

Special Note Regarding Forward-Looking Statements

This Form 10-Q contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and Section 27A of the Securities Act of 1933, as amended. When used in this Quarterly Report on Form 10-Q or elsewhere by management from time to time, the words “believe,” “anticipate,” “intend,” “plan,” “estimate,” “expect,” “may,” “will,” “could,” “potentially,” “possibility,” and similar expressions are forward-looking statements. Such forward-looking statements contained herein are based on current expectations and beliefs. Any such forward-looking statements are not guarantees of future performance and involve risks and uncertainties. Actual events or results may differ materially from those discussed in the forward-looking statements as a result of various factors. Forward-looking statements made in this report include, but are not limited to, statements about:

•

potential uses and benefits of larsucosterol to treat alcohol-associated hepatitis (“AH”), non-alcoholic steatohepatitis, or other conditions;

•

the results and timing of clinical trials, including clinical trial plans and timelines for larsucosterol;

•

the likelihood of future clinical trial results of larsucosterol being positive with statistical significance and/or similar to results from previous trials, the possible commencement of future clinical trials;

•

our communication with the U.S. Food and Drug Administration (“FDA”) regarding the trial design for a Phase 3 clinical trial for larsucosterol in AH and the potential for a New Drug Application filing;

•

our intention to seek, and ability to enter into and maintain strategic alliances and collaborations;

•

the potential benefits and uses of our products and product candidates, including larsucosterol and POSIMIR;

•

the potential milestone and royalty payments we may receive from Innocoll Pharmaceuticals Limited related to POSIMIR, earn-out payments we may receive from Indivior UK Limited related to the commercialization of PERSERIS, and milestone, sub-license fees and royalty payments we may receive from Orient Pharma Co., Ltd.;

•

market opportunities for product candidates in our product development pipeline;

•

potential regulatory filings for or approval of larsucosterol;

•

the progress and results of our research and development programs and our evaluation of additional development programs;

•

requirements for us to purchase pre-clinical, clinical trial and commercial supplies of product candidates and/or products, as well as raw materials or active pharmaceutical ingredients from third parties, and the ability of third parties to provide us with our requirements for such supplies and raw materials;

•

conditions for obtaining regulatory approval of our product candidates;

•

submission and timing of applications for regulatory approval and timing of responses to our regulatory submissions;

•

the impact of FDA, European Medicines Agency and other government regulation on our business;

•

our ability to obtain, assert and protect patents and other intellectual property rights, including intellectual property licensed to our collaborators, as well as avoiding the intellectual property rights of others;

•

products and companies that will compete with our products and the product candidates we develop and/or license to third-party collaborators;

•

our employees, including the number of employees and the continued services of key management, technical and scientific personnel;

•

our future performance, including our anticipation that we will not derive meaningful revenues from our products and product candidates in development for at least the next twelve months, potential for future inventory write-offs and our expectations regarding our ability to achieve profitability;

•

sufficiency of our cash resources, anticipated capital requirements and capital expenditures, our ability to comply with covenants of our term loan, our need or desire for additional financing, including potential sales under our shelf registration statement and our ability to continue to operate as a going concern;

•

our expectations regarding research and development expenses, and selling, general and administrative expenses;

•

the composition of future revenues; and

•

accounting policies and estimates.

We caution you that the foregoing list may not contain all of the forward-looking statements made in this Quarterly Report on Form 10-Q. Forward-looking statements are not guarantees of future performance and involve risks and uncertainties. Actual events or results may differ materially from those discussed in the forward-looking statements as a result of various factors. For a more detailed discussion of such forward looking statements and the potential risks and uncertainties that may impact upon their accuracy, see the “Overview” section of the Management’s Discussion and Analysis of Financial Condition and Results of Operations herein and Part I, Item 1A., “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on March 28, 2024 and any additional risk factors that may be described herein or in our subsequent reports filed with the SEC “Risk Factors” section. These forward-looking statements reflect our view only as of the date of this report. We undertake no obligations to update any forward-looking statements. You should also carefully consider the factors set forth in other reports or documents that we file from time to time with the Securities and Exchange Commission.

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

DURECT CORPORATION

CONDENSED BALANCE SHEETS

(in thousands)

(unaudited)


	March 31, 2024			December 31, 2023
A S S E T S
Current assets:
Cash and cash equivalents	$	19,252		$	28,400
Short-term investments		2,187			1,280
Accounts receivable, net		1,020			1,261
Inventories, net		2,398			2,219
Prepaid expenses and other current assets		1,228			1,511
Total current assets		26,085			34,671
Property and equipment, net		58			91
Operating lease right-of-use assets		3,631			3,980
Goodwill		6,169			6,169
Long-term restricted investments		150			150
Other long-term assets		128			128
Total assets	$	36,221		$	45,189
L I A B I L I T I E S A N D S T O C K H O L D E R S’ E Q U I T Y
Current liabilities:
Accounts payable	$	782		$	1,777
Accrued liabilities		5,105			5,966
Term loan, current portion, net		14,612			16,663
Operating lease liabilities, current portion		1,298			1,381
Warrant liabilities		2,942			1,224
Total current liabilities		24,739			27,011
Operating lease liabilities, non-current portion		2,466			2,702
Other long-term liabilities		716			693
Commitments and contingencies
Stockholders’ equity:
Common stock		23			23
Additional paid-in capital		604,936			603,780
Accumulated other comprehensive loss		(10	)		(14	)
Accumulated deficit		(596,649	)		(589,006	)
Stockholders’ equity		8,300			14,783
Total liabilities and stockholders’ equity	$	36,221		$	45,189

The accompanying notes are an integral part of these condensed financial statements.

DURECT CORPORATION

CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(in thousands, except per share amounts)

(unaudited)


	Three months ended March 31,
	2024			2023
Collaborative research and development and other revenue	$	496		$	643
Product revenue, net		1,331			1,411
Total revenues		1,827			2,054
Operating expenses:
Cost of product revenues		289			388
Research and development		4,119			8,593
Selling, general and administrative		3,136			4,095
Total operating expenses		7,544			13,076
Loss from operations		(5,717	)		(11,022	)
Other income (expense):
Interest and other income		321			517
Interest and other expenses		(529	)		(726	)
Change in fair value of warrant liabilities		(1,718	)		2,477
Issuance cost for warrants		—			(1,200	)
Loss on issuance of warrants		—			(2,033	)
Other income (expense), net		(1,926	)		(965	)
Net loss		(7,643	)		(11,987	)
Net change in unrealized gain on available-for-sale securities, net of reclassification adjustments and taxes		4			6
Total comprehensive loss	$	(7,639	)	$	(11,981	)

Net loss per share
Basic	$	(0.25	)	$	(0.50	)
Diluted	$	(0.25	)	$	(0.52	)

Weighted-average shares used in computing net loss per share
Basic		30,637			23,767
Diluted		30,637			23,940

The accompanying notes are an integral part of these condensed financial statements.

DURECT CORPORATION

CONDENSED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands, except per share amounts)

(unaudited)


	Common Stock				Additional Paid-In		Accumulated Other Comprehensive			Accumulated			Total Stockholders’
	Shares		Amount		Capital		Loss			Deficit			Equity
Balance at December 31, 2023		30,334	$	23	$	603,780	$	(14	)	$	(589,006	)	$	14,783
Issuance of common stock pursuant to the 2021 Sales Agreement, net of issuance costs of $13		702		—		647		—			—			647
Stock-based compensation expense from stock options and ESPP shares		—		—		509		—			—			509
Net loss		—		—		—		—			(7,643	)		(7,643	)
Net change in unrealized loss on available-for-sale securities, net of reclassification adjustments and taxes		—		—		—		4			—			4
Balance at March 31, 2024		31,036	$	23	$	604,936	$	(10	)	$	(596,649	)	$	8,300

Balance at December 31, 2022		22,785	$	23	$	586,357	$	(13	)	$	(561,382	)	$	24,985
Issuance of common stock in the February 2023 registered direct offering		1,700		—		—		—			—			—
Stock-based compensation expense from stock options and ESPP shares		—		—		2,338		—			—			2,338
Net loss		—		—		—		—			(11,987	)		(11,987	)
Net change in unrealized loss on available-for-sale securities, net of reclassification adjustments and taxes		—		—		—		6			—			6
Balance at March 31, 2023		24,485	$	23	$	588,695	$	(7	)	$	(573,369	)	$	15,342

The accompanying notes are an integral part of these condensed financial statements

DURECT CORPORATION

CONDENSED STATEMENTS OF CASH FLOWS

(in thousands)

(unaudited)


	Three months ended March 31,
	2024			2023
Cash flows from operating activities
Net loss	$	(7,643	)	$	(11,987	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and accretion		51			44
Stock-based compensation		509			602
Change in fair value of warrant liabilities		1,718			(2,477	)
Loss on issuance of warrants		—			2,033
Other		96			100
Changes in assets and liabilities:
Accounts receivable		241			2,022
Inventories		(180	)		(98	)
Prepaid expenses and other assets		283			109
Accounts payable		(995	)		(1,100	)
Accrued liabilities		(846	)		1,311
Deferred revenue		—			178
Total adjustments		877			2,724
Net cash used in operating activities		(6,766	)		(9,263	)
Cash flows from investing activities
Purchases of available-for-sale securities		(887	)		(4,924	)
Net cash used in investing activities		(887	)		(4,924	)
Cash flows from financing activities
Payments on term loan principal		(2,143	)		—
Net proceeds from issuances of common stock pursuant to the 2021 Sales Agreement		648			—
Proceeds from issuances of warrants and common stock		—			10,000
Net cash (used in) provided by financing activities		(1,495	)		10,000
Net decrease in cash, cash equivalents, and restricted cash		(9,148	)		(4,187	)
Cash, cash equivalents, and restricted cash, beginning of the period (1)		28,550			43,633
Cash, cash equivalents, and restricted cash, end of the period (1)	$	19,402		$	39,446

(1) Includes restricted cash of $150,000 included in long term restricted investments on the condensed balance sheets at March 31, 2024, December 31, 2023 and March 31, 2023, respectively.

The accompanying notes are an integral part of these condensed financial statements.

DURECT CORPORATION

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

Note 1. Summary of Significant Accounting Policies

Nature of Operations

DURECT Corporation (the “Company”) was incorporated in the state of Delaware on February 6, 1998. The Company is a biopharmaceutical company committed to transforming the treatment of acute organ injury and chronic liver diseases by advancing novel and potentially lifesaving therapies based on its endogenous epigenetic regulator program. Larsucosterol, the Company's lead drug candidate, binds to and inhibits the activity of DNA methyltransferases ("DNMTs"), epigenetic enzymes which are elevated and associated with hypermethylation found in alcohol-associated hepatitis ("AH") patients. Larsucosterol is in clinical development for the potential treatment of AH, for which FDA has granted a Fast Track Designation; metabolic dysfunction-associated steatohepatitis (“MASH”), also known as non-alcoholic steatohepatitis or NASH is also being explored. In addition, POSIMIR® (bupivacaine solution) for infiltration use, a non-opioid analgesic utilizing the innovative SABER® platform technology, is FDA-approved and has been exclusively licensed to Innocoll Pharmaceuticals for commercialization in the United States. The Company also manufactures and sells osmotic pumps used in laboratory research, and manufactures certain excipients for certain clients for use as raw materials in their products.

Basis of Presentation

These condensed financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”), and therefore do not include all the information and footnotes necessary for a complete presentation of the Company’s results of operations, financial position and cash flows in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”). The unaudited condensed financial statements reflect all adjustments (consisting only of normal recurring adjustments) which are, in the opinion of management, necessary for a fair presentation of the financial position at March 31, 2024, the operating results and comprehensive loss, and stockholders’ equity for the three months ended March 31, 2024 and 2023, and cash flows for the three months ended March 31, 2024 and 2023. The balance sheet as of December 31, 2023 has been derived from audited financial statements at that date but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements. These financial statements and notes should be read in conjunction with the Company’s audited financial statements and notes thereto, included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2023 filed with the SEC.

The results of operations for the interim periods presented are not necessarily indicative of results that may be expected for any other interim period or for the full fiscal year.

Liquidity and Need to Raise Additional Capital

As of March 31, 2024, the Company had an accumulated deficit of $596.6 million as well as negative cash flows from operating activities. Presently, the Company does not have sufficient cash resources to meet its plans for the next twelve months following the issuance of these financial statements. The Company will continue to require substantial funds to continue research and development, including clinical trials of its product candidates. These factors raise substantial doubt regarding the Company’s ability to continue as a going concern for a period of one year from the issuance of these financial statements. Management’s plans in order to meet its operating cash flow requirements include seeking additional collaborative agreements for certain of its programs as well as financing activities such as public offerings and private placements of its common stock, preferred stock offerings, issuances of debt and convertible debt instruments.

There are no assurances that such additional funding will be obtained and that the Company will succeed in its future operations. If the Company cannot successfully raise additional capital and implement its strategic development plan, its liquidity, financial condition and business prospects will be materially and adversely affected, and the Company may have to cease operations. As further described in Note 8, the Company classified the remaining balance of its term loan as a current liability on the Company’s balance sheet as of March 31, 2024 and December 31, 2023 due to the timing of repayment obligations and due to recurring losses, liquidity concerns and a subjective acceleration clause in the Company’s Loan Agreement. These financial statements have been prepared on a going concern basis and do not include any adjustments to the amounts and classification of assets and liabilities that may be necessary in the event the Company can no longer continue as a going concern.

Inventories

Inventories are stated at the lower of cost or net realizable value, with cost determined on a first-in, first-out basis. The Company capitalizes inventories produced in preparation for product launches after receiving regulatory approval on a product. The Company may be required to expense previously capitalized inventory costs upon a change in management’s judgment due to new information that suggests that the inventory will not be saleable.

The Company’s inventories consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Raw materials	$	173	$	165
Work in process		1,060		1,164
Finished goods		1,165		890
Total inventories	$	2,398	$	2,219

Leases

ASC 842 requires the Company to recognize an operating lease right-of-use asset and corresponding operating lease liability for the Company’s leased properties. The Company’s operating lease right-of-use assets and liabilities are recognized under ASC 842 based on the present value of lease payments over the remaining lease term at the lease commencement date. In determining the net present value of lease payments, we estimate the incremental borrowing rate based on the information available, including remaining lease term. As of March 31, 2024, the weighted-average remaining lease term was 3.33 years for the Company’s leased properties.

Revenue Recognition

Product Revenue, Net

The Company manufactures and sells ALZET osmotic pumps used in laboratory research, and manufactures and sells certain excipients used by pharmaceutical companies as raw materials in certain of their products, including POSIMIR, a marketed animal health product and Methydur.

Revenues from product sales are recognized when the customer obtains control of the Company’s product, which occurs at a point in time, typically upon shipment to the customer. The Company expenses incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that the Company would have recognized is one year or less.

Trade Discounts and Allowances: The Company provides certain customers with discounts that are explicitly stated in the Company’s contracts and are recorded as a reduction of revenue in the period the related product revenue is recognized.

Product Returns: The Company generally offers customers a limited right of return for products that have been purchased. The Company estimates the amount of its product sales that are probable of being returned by its customers and records this estimate as a reduction of revenue in the period the related product revenue is recognized. The Company currently estimates product return liabilities primarily using its historical sales information. The Company expects product returns to be minimal.

Collaborative Research and Development and Other Revenue

The Company enters into license agreements, under which it licenses certain rights to its product candidates or products to third parties. The terms of these arrangements typically include payment to the Company of one or more of the following: non-refundable, up-front license fees; reimbursement of development costs incurred by the Company under approved work plans; development, regulatory, intellectual property and commercial milestone payments; payments for manufacturing supply services the Company provides itself or through its contract manufacturers; and royalties on net sales of licensed products. Each of these payments results in collaborative research and development revenues, except for revenues from royalties on net sales of licensed products and earn-out revenues, which are classified as other revenues.

In determining the appropriate amount of revenue to be recognized as it fulfills its obligations under each of its agreements, the Company performs the following steps: (i) identification of the promised goods or services in the contract; (ii) determination of whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation. For arrangements that are determined to include multiple performance obligations, the Company must develop assumptions that require judgment to determine the estimated stand-alone selling price for each performance obligation identified. These assumptions may include: forecasted revenues, development timelines, reimbursement rates for personnel costs, discount rates and probabilities of technical and regulatory success. The Company expects to recognize revenue for the variable consideration currently being constrained when it is probable that a significant revenue reversal will not occur.

Licenses of intellectual property: If the license to the Company’s intellectual property is determined to be distinct from the other performance obligations identified in the arrangement, the Company recognizes revenues from the transaction price allocated to the license when the license is transferred to the customer and the customer is able to use and benefit from the license. For performance obligations comprised of licenses that are bundled with other promises, the Company utilizes its judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time and, if over time, the Company applies an appropriate method of measuring progress for purposes of recognizing related revenues from the allocated transaction price. For performance obligations recognized over time, the Company evaluates the measure of progress each reporting period and recognizes revenues on a cumulative catch-up basis as collaborative research and development revenues.

Milestone Payments: At the inception of each arrangement that includes development milestone payments, the Company evaluates whether the milestones are considered probable of being reached and estimates the amount to be included in the transaction price using the most likely amount method. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within the control of the Company or the licensee, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. The transaction price is then allocated to each performance obligation on a relative stand-alone selling price basis, for which the Company recognizes revenue as or when the performance obligations under the contract are satisfied. At the end of each subsequent reporting period, the Company re-evaluates the probability of achievement of such development milestones and any related constraint, and if necessary, adjusts its estimate of the overall transaction price.

Manufacturing Supply Services: Arrangements that include a promise for future supply of raw materials or drug product for either clinical development or commercial supply at the customer’s discretion are generally considered as options. The Company assesses if these options provide a material right to the customer and if so, they are accounted for as separate performance obligations and allocated a portion of the transaction price based on the estimated standalone selling price of the material right. If the Company is entitled to additional payments when the customer exercises these options, the deferred transaction price and any additional payments are recorded in collaborative research and development revenue when the customer obtains control of the goods.

Royalties and Earn-outs: For arrangements that include sales-based royalties or earn-outs, including milestone payments based on first commercial sale or the level of sales, and the license is deemed to be the predominant item to which the royalties relate, the Company recognizes revenue at the later of (i) when the related sales occur, or (ii) when the performance obligation to which some or all of the royalty or earn-out has been allocated has been satisfied (or partially satisfied). To date, the Company has not recognized material royalty revenue resulting from the Company’s collaborative arrangements or material earn-out revenues from any of the Company’s agreements.

Research and development services: Revenue from research and development services that are determined to represent a distinct performance obligation related to services performed under the collaborative arrangements with the Company’s third-party collaborators is recognized over time as the related research and development services are performed using an appropriate method of measuring progress. The Company evaluates the measure of progress each reporting period and recognizes revenue on a cumulative catch-up basis, as collaborative research and development revenue. Research and development expenses under the collaborative research and development agreements generally approximate or exceed the revenue recognized under such agreements over the term of the respective agreements. Deferred revenue may result when the Company does not expend the required level of effort during a specific period in comparison to funds received under the respective agreement.

The Company receives payments from its customers based on development cost schedules established in each contract. Up-front payments are recorded as deferred revenue upon receipt or when due and may require deferral of revenue recognition to a future period until the Company performs its obligations under these arrangements. Amounts are recorded as accounts receivable when the Company’s right to consideration is unconditional. The Company does not assess whether a contract has a significant financing component if the expectation at contract inception is such that the period between payment by the customer and the transfer of the promised goods or services to the customer will be one year or less.

Total revenue by geographic region based on customers’ locations for the three months ended March 31, 2024 and 2023 are as follows (in thousands):


	Three months ended March 31,
	2024		2023
United States	$	973	$	1,278
Europe		543		431
Japan		147		170
Other		164		175
Total	$	1,827	$	2,054

Prepaid and Accrued Clinical Costs

The Company incurs significant costs associated with third party consultants and organizations for pre-clinical studies, clinical trials, contract research, regulatory advice and other research and development-related services. The Company is required to estimate periodically the cost of services rendered but unbilled based on management’s estimates. Estimates are determined each reporting period by reviewing the terms and conditions of the underlying contracts, reviewing open purchase orders and by having detailed discussions with internal clinical personnel and third-party service providers as to the nature and status of the services performed in relation to amounts billed. The costs for unbilled services are estimated by applying the rates and fees applicable in the underlying contracts. If these good faith estimates are inaccurate, actual expenses incurred could materially differ from these estimates.

Prepaid and Accrued Manufacturing Costs

The Company incurs significant costs associated with third party consultants and organizations for manufacturing, validation, testing and other research and development-related services. The Company is required to estimate periodically the cost of services rendered but unbilled based on management’s estimates. Estimates are determined each reporting period by reviewing the terms and conditions of the underlying contracts, reviewing open purchase orders and by having detailed discussions with internal personnel and third-party service providers as to the nature and status of the services performed in relation to amounts billed. The costs for unbilled services are estimated by applying the rates and fees applicable in the underlying contracts. If these good faith estimates are inaccurate, actual expenses incurred could materially differ from these estimates.

Research and Development Expenses

Research and development expenses are primarily comprised of salaries and benefits associated with research and development personnel, overhead and facility costs, preclinical and non-clinical development costs, clinical trial and related clinical manufacturing costs, contract services, and other outside costs. Research and development costs are expensed as incurred. Research and development costs paid to third parties under sponsored research agreements are recognized as the related services are performed. In addition, research and development expenses incurred that are reimbursed by the Company’s partners are recorded as collaborative research and development revenue.

Comprehensive Loss

Components of other comprehensive loss are comprised entirely of unrealized gains and losses on the Company’s available-for-sale securities for all periods presented. Total comprehensive loss has been disclosed in the Company’s Statements of Operations and Comprehensive Loss.

Common Stock Warrants

The Company accounts for its common stock warrants in accordance with ASC 480, Distinguishing Liabilities from Equity ("ASC 480") and ASC 815, Derivatives and Hedging (“ASC 815”). Based upon the provisions of ASC 480 and ASC 815, the Company accounts for common stock warrants and pre-funded warrants as current liabilities if the warrant fails the equity classification criteria. Common stock warrants and pre-funded warrants classified as liabilities are initially recorded at fair value on the grant date and remeasured at each balance sheet date with the offsetting adjustments recorded in change in fair value of warrant liabilities within the statements of operations.

The Company values its pre-funded warrants and common stock warrants classified as liabilities using the Black-Scholes option pricing model or other acceptable valuation models, including the Monte-Carlo simulation model.

Net Loss Per Share

Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding. Diluted net loss per share is computed using the weighted-average number of common shares outstanding and common stock equivalents (i.e., options to purchase common stock) outstanding during the period, if dilutive, using the treasury stock method for options.

The numerators and denominators in the calculation of basic and diluted net loss per share were as follows (in thousands except per share amounts):


	Three months ended March 31,
	2024			2023
Basic loss per share computation:
Net loss	$	(7,643	)	$	(11,987	)
Weighted average number of shares outstanding - basic		30,637			23,767
Net loss per share - basic	$	(0.25	)	$	(0.50	)

Diluted loss per share computation:
Net loss	$	(7,643	)	$	(11,987	)
Change in fair value of pre-funded warrant liabilities		—			384
Net loss adjusted for change in fair value of warrant liabilities	$	(7,643	)	$	(12,371	)

Weighted average shares used to compute basic net loss per share		30,637			23,767
Dilutive effect of pre-funded warrants		—			173
Weighted average shares used to compute diluted net loss per share		30,637			23,940
Net loss per share - diluted	$	(0.25	)	$	(0.52	)

Options to purchase approximately 4.0 million and 3.0 million shares of common stock were excluded from the denominator in the calculation of diluted net loss per share for the three months ended March 31, 2024 and March 31, 2023, respectively, as the effect would be antidilutive. Additional common warrants to purchase 261,000 and 1.2 million shares were also outstanding during the three months ended March 31, 2024 and 2023, respectively, but were not included in the computation of diluted net loss per share because the effect would be anti-dilutive.

Recent Accounting Pronouncements

In November 2023, the FASB issued Accounting Standards Update (“ASU”) 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (ASU 2023-07). The amendments in ASU 2023-07 are intended to improve reportable segment disclosure, primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 is effective for annual periods beginning after December 15, 2023, and interim periods beginning after December 15, 2024. The amendments in this ASU should be applied retrospectively to all prior periods presented in the financial statements. Early adoption is permitted. The Company is evaluating the impact of this guidance on its financial statements and related disclosures.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures (ASU 2023-09). ASU 2023-09 requires enhanced annual disclosures regarding the rate reconciliation and income taxes paid information. ASU 2023-09 is effective for annual periods beginning after December 15, 2024 and may be adopted on a prospective or retrospective basis. Early adoption is permitted. The Company is evaluating the impact of this guidance on its financial statements and related disclosures.

Note 2. Strategic Agreements

The collaborative research and development and other revenues associated with the Company’s collaborators or counterparties were $496,000 and $643,000 for the three months ended March 31, 2024 and 2023, respectively. The collaborative research and development and other revenue included (a) amounts related to earn-out revenue from Indivior UK Limited ("Indivior") with respect to PERSERIS net sales; (b) feasibility programs and research and development activities funded by our collaborators and (c) royalty revenue from Orient Pharma Co., Ltd. (“Orient Pharma”) with respect to Methydur net sales.

Agreement with Innocoll

On December 21, 2021, the Company entered into a license agreement (the “Innocoll Agreement”) with Innocoll Pharmaceuticals Limited (“Innocoll”). Pursuant to the Innocoll Agreement, the Company has granted Innocoll an exclusive, royalty-bearing, sublicensable right and license to develop, manufacture and commercialize in the United States, POSIMIR®, the Company’s FDA-approved post-surgical pain product, with respect to all uses and applications in humans. The Innocoll Agreement provides for the assignment of the Company’s supply agreement with its contract manufacturing organization to Innocoll and also provides Innocoll with the right, within the United States, to expand the approved indications of POSIMIR. The Company retains, outside the United States, all of the global rights to POSIMIR.

The Company receives tiered, low double-digit to mid-teen royalties on net product sales of POSIMIR in the United States. The Company may earn additional milestone payments of up to $122.0 million in the aggregate, depending on the achievement of certain regulatory, commercial, and intellectual property milestones with respect to POSIMIR. There were no revenues recognized related to the Innocoll Agreement for the three-month periods ending March 31, 2024 and 2023.

Patent Purchase Agreement with Indivior

In September 2017, we entered into an agreement with Indivior (the “Indivior Agreement”), under which we assigned to Indivior certain patents that may provide further intellectual property protection for PERSERIS, Indivior’s extended-release injectable suspension for the treatment of schizophrenia in adults. In consideration for such assignment, Indivior made non-refundable upfront and milestone payments to DURECT totaling $17.5 million. Additionally, under the terms of the agreement with Indivior, the Company receives quarterly earn-out payments into 2026 that are based on a single digit percentage of U.S. net sales of PERSERIS. Indivior commercially launched PERSERIS in the U.S. in February 2019. The Indivior Agreement contains customary representations, warranties and indemnities of the parties. Amounts recognized during the three months ended March 31, 2024 and 2023 related to earn-out revenues from PERSERIS have been immaterial and are included in collaborative research and development and other revenue.

Note 3. Financial Instruments

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company’s valuation techniques used to measure fair value maximize the use of observable inputs and minimize the use of unobservable inputs. The Company follows a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value. These levels of inputs are the following:

•

Level 1—Quoted prices in active markets for identical assets or liabilities.

•

Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

•

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company’s financial instruments are valued using quoted prices in active markets or based upon other observable inputs. Money market funds are classified as Level 1 financial assets. Certificates of deposit, commercial paper, municipal bonds, corporate debt securities, and U.S. Government agency securities are classified as Level 2 financial assets. The fair value of the Level 2 assets is estimated using pricing models using current observable market information for similar securities. The Company’s Level 2 investments include U.S. government-backed securities and corporate securities that are valued based upon observable inputs that may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data including market research publications. The fair value of commercial paper is based upon the time to maturity and discounted using the three-month treasury bill rate. The average remaining maturity of the Company’s Level 2 investments as of March 31, 2024 is less than twelve months and these investments are rated by S&P and Moody’s at AAA or AA- for securities and A1, A2, P1 or P2 for commercial paper.

The following is a summary of available-for-sale securities as of March 31, 2024 and December 31, 2023 (in thousands):


	March 31, 2024
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Money market funds	$	62	$	—	$	—		$	62
Certificates of deposit		150		—		—			150
Commercial paper		17,713		—		(10	)		17,703
	$	17,925	$	—	$	(10	)	$	17,915
Reported as:
Cash and cash equivalents	$	15,587	$	—	$	(9	)	$	15,578
Short-term investments		2,188		—		(1	)		2,187
Long-term restricted investments		150		—		—			150
	$	17,925	$	—	$	(10	)	$	17,915


	December 31, 2023
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Money market funds	$	951	$	—	$	—		$	951
Certificates of deposit		150		—		—			150
Commercial paper		24,896		—		(14	)		24,882
	$	25,997	$	—	$	(14	)	$	25,983
Reported as:
Cash and cash equivalents	$	24,566	$	—	$	(13	)	$	24,553
Short-term investments		1,281		—		(1	)		1,280
Long-term restricted investments		150		—		—			150
	$	25,997	$	—	$	(14	)	$	25,983

The following is a summary of the cost and estimated fair value of available-for-sale securities at March 31, 2024, by contractual maturity (in thousands):


	March 31, 2024
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	17,713	$	17,703
Mature after one year through five years		150		150
	$	17,863	$	17,853

There were no securities that have had an unrealized loss for more than 12 months as of March 31, 2024.

As of March 31, 2024, unrealized losses on available-for-sale investments are not attributed to credit risk and are considered to be temporary. The Company believes that it is more-likely-than-not that investments in an unrealized loss position will be held until maturity or the recovery of the cost basis of the investment. To date, the Company has not recorded any impairment charges on marketable securities related to other-than-temporary declines in market value.

Warrant Liabilities

The following table summarizes the activity of the Company’s Level 3 warrant liabilities during the three months ended March 31, 2024 and 2023 (in thousands):


	Three months ended March 31,
	2024		2023
Fair value at beginning of period - February 2023 issuance (Pre-funded warrants)	$	—	$	—
Initial fair value at the original issuance date		—		1,743
Change in fair value during the period		—		(384	)
Fair value at end of period - February 2023 issuance (Pre-funded warrants)	$	—	$	1,359

Fair value at beginning of period - February 2023 issuance (Common warrants)	$	312	$	—
Initial fair value at the original issuance date		—		10,290
Change in fair value during the period		360		(2,093	)
Fair value at beginning of period - February 2023 issuance (Common warrants)	$	672	$	8,197

Fair value at beginning of period - July 2023 issuance (Common warrants)	$	912	$	—
Change in fair value during the period		1,358		—
Fair value at end of period - July 2023 issuance	$	2,270	$	—

Total fair value at end of period	$	2,942	$	9,556

February 2023 Warrants

In February 2023, the Company issued pre-funded warrants to purchase an aggregate of 300,000 shares of common stock and common warrants to purchase an aggregate of 2,000,000 shares of common stock in a registered direct offering.

Pre-Funded Warrants

The pre-funded warrants were accounted for as current liabilities on the balance sheet and were adjusted to estimated fair value at period end through “other income (expense)” on the statement of operations. The estimated fair value of the outstanding pre-funded warrants was $1.7 million, zero and zero as of February 8, 2023 (i.e., the issuance date), December 31, 2023 and March 31, 2024, respectively. In November 2023, all 300,000 shares of the pre-funded warrants were exercised in accordance with the financing agreement, resulting in an issuance of 300,000 shares of common stock to the holder. The Company calculated the estimated fair value of the pre-funded warrants using a Black-Scholes option pricing model with the following key assumptions:


	February 8, 2023 (issuance)
Common stock price	$	5.81
Exercise price per share	$	0.00001
Expected volatility		86.60	%
Risk-free interest rate		3.82	%
Contractual term (in years)		5.00
Expected dividend yield		—	%

Common Warrants

The common warrants are accounted for as current liabilities on the balance sheet and are adjusted to estimated fair value at period end through “other income (expense)” on the statement of operations. The estimated fair value of the outstanding common warrants was $10.3 million, $312,000 and $672,000 as of February 8, 2023 (i.e., the issuance date), December 31, 2023 and March 31, 2024, respectively. In September 2023, 1,400,000 shares of the common warrants were exercised through the alternative cashless exercise provision in accordance with the financing agreement, resulting in a net issuance of 924,000 shares to the holder. The aggregate number of shares of our common stock issuable in such alternative cashless exercise equals the product of (x) the aggregate number of shares of our common stock that would be issuable upon exercise of the common warrant in accordance with the terms of such common warrant if such exercise were by means of a cash exercise rather than a cashless exercise and (y) 0.66. The Company calculated the estimated fair value of the common warrants using a Monte Carlo simulation model with the following key assumptions. The Company took the likelihood of achieving certain clinical events and related impact on the Company's common stock price into account, as appropriate.

The exercise price for the outstanding common warrants (i.e., 600,000 shares) was adjusted down from $5.00 per share to $0.51 per share as of December 31, 2023 as a result of an anti-dilution provision in the common warrants issued in the February 2023 financing that was triggered by the sale of our common stock in the open market in November 2023. There were 600,000 shares of outstanding common warrants as of March 31, 2024.


	February 8, 2023 (issuance)			March 31,2023			December 31, 2023			March 31,2024
Common stock price	$	5.81		$	4.53		$	0.59		$	1.21
Exercise price per share	$	5.00		$	5.00		$	0.51		$	0.51
Expected volatility		86.60	%		86.20	%		118.00	%		115.00	%
Risk-free interest rate		3.82	%		3.65	%		3.93	%		4.31	%
Contractual term (in years)		5.00			4.90			4.10			3.90
Expected dividend yield		—	%		—	%		—	%		—	%

July 2023 warrants

In July 2023, the Company issued common warrants to purchase an aggregate of 2,991,027 shares of common stock in a registered direct offering.



	July 21, 2023 (issuance)			December 31, 2023			March 31, 2024
Common stock price	$	3.05		$	0.59		$	1.21
Exercise price per share	$	4.89		$	4.89		$	4.89
Expected volatility		88.60	%		115.60	%		115.93	%
Risk-free interest rate		4.18	%		3.88	%		4.26	%
Contractual term (in years)		5.00			4.60			4.30
Expected dividend yield		—	%		—	%		—	%

There were no exercises of the common warrants issued in the July 2023 registered direct offering.

Note 4. Accrued Liabilities

Accrued liabilities as of March 31, 2024 and December 31, 2023 were comprised as follows (in thousands):


	March 31, 2024		December 31, 2023
Accrued compensation and benefits	$	1,534	$	1,320
Accrued contract research and manufacturing costs		2,704		2,340
Accrued clinical costs		78		1,578
Others		789		728
Total	$	5,105	$	5,966

Note 5. Stock-Based Compensation

As of March 31, 2024, the Company has two stock-based compensation plans. The stock-based compensation cost that has been included in the statements of operations and comprehensive loss is shown as below (in thousands):


	Three months ended March 31,
	2024		2023
Cost of product revenues	$	4	$	4
Research and development		212		292
Selling, general and administrative		293		306
Total stock-based compensation	$	509	$	602

As of March 31, 2024 and December 31, 2023, $14,000 of stock-based compensation cost was capitalized in inventory on the Company’s balance sheets for each period, respectively.

The Company uses the Black-Scholes option pricing model to value its stock options. The expected life computation is based on historical exercise patterns and post-vesting termination behavior. The Company considered its historical volatility in developing its estimate of expected volatility.

The Company used the following assumptions to estimate the fair value of stock options granted and shares purchased under its employee stock purchase plan for the three months ended March 31, 2024 and 2023. There were no stock options granted for the three months ended March 31, 2024.


	Three months ended March 31,
	2024		2023
Stock Options
Risk-free rate		—	4.05-4.07%
Expected dividend yield		—		—
Expected life of option (in years)		—	7.0-7.5
Volatility		—	87-88%


	Three months ended March 31,
	2024			2023
Employee Stock Purchase Plan
Risk-free rate		5.5	%		4.6	%
Expected dividend yield		—			—
Expected life of option (in years)	0.5			0.5
Volatility		92	%		104	%

Note 6. Term Loan

In July 2016, the Company entered into a $20.0 million secured single-draw term loan (as amended, the “Loan Agreement”) with Oxford Finance LLC (“Oxford Finance”). The Company and Oxford Finance entered into five subsequent amendments to the Loan Agreement in February 2018, November 2018, December 2019, March 2021 and May 2021. For amendments 1-3 and 5, the Company paid Oxford Finance loan modification fees of $100,000, $900,000, $825,000 and $712,500, respectively. As amended, the Loan Agreement provides for interest only payments through June 1, 2023, followed by consecutive monthly payments of principal and interest in arrears starting on June 1, 2023 and continuing through the maturity date of the term loan of September 1, 2025. The Loan Agreement provides for a floating interest rate (7.95% initially and 12.73% as of March 31, 2024) based on an index rate plus a spread. In addition, a payment equal to 10% of the principal amount of the term loan is due when the term loan becomes due or upon the prepayment of the facility. If the Company elects to prepay the loan, there is also a prepayment fee of between 0.75% and 2.5% of the principal amount of the term loan depending on the timing of prepayment. The $150,000 facility fee that was paid at the original closing, the loan modification fees and other debt offering/issuance costs have been recorded as debt discount on the Company’s balance sheets and together with the final $2.0 million payment are being amortized to interest expense using the effective interest method over the revised term of the loan. The Company made principal payments of $5.0 million in 2023 and $2.1 million during the three months ended March 31, 2024.

The term loan is secured by substantially all of the assets of the Company, except that the collateral does not include any intellectual property (including licensing, collaboration and similar agreements relating thereto), and certain other excluded assets. The Loan Agreement contains customary representations, warranties and covenants by the Company, which covenants limit the Company’s ability to convey, sell, lease, transfer, assign or otherwise dispose of certain assets of the Company; engage in any business other than the businesses currently engaged in by the Company or reasonably related thereto; liquidate or dissolve; make certain management changes; undergo certain change of control events; create, incur, assume, or be liable with respect to certain indebtedness; grant certain liens; pay dividends and make certain other restricted payments; make certain investments; and make payments on any subordinated debt.

The Loan Agreement also contains customary indemnification obligations and customary events of default, including, among other things, the Company’s failure to fulfill certain obligations of the Company under the Loan Agreement and the occurrence of a material adverse change which is defined as a material adverse change in the Company’s business, operations, or condition (financial or otherwise), a material impairment of the prospect of repayment of any portion of the loan, or a material impairment in the perfection or priority of lender’s lien in the collateral or in the value of such collateral. In the event of default by the Company under the Loan Agreement, the lender would be entitled to exercise its remedies thereunder, including the right to accelerate the debt, upon which the Company may be required to repay all amounts then outstanding under the Loan Agreement, which could harm the Company’s financial condition. The conditionally exercisable call option related to the event of default is considered to be an embedded derivative which is required to be bifurcated and accounted for as a separate financial instrument. In the periods presented, the value of the embedded derivative is not material, but could become material in future periods if an event of default became more probable than is currently estimated.

As of March 31, 2024, the Company was in compliance with all material covenants under the Loan Agreement and there had been no material adverse change. In accordance with ASC 470-10-45-2, the term loan was classified as a current liability on the Company’s balance sheet as of March 31, 2024 and December 31, 2023 due to the timing of repayment obligations and due to recurring losses, liquidity concerns and a subjective acceleration clause in the Company’s Loan Agreement.

The fair value of the term loan approximates the carrying value. Future maturities due under the term loan as of March 31, 2024, are as follows (in thousands):


Nine months ended December 31, 2024	$	6,429
2025		8,429
Total minimum payments		14,858
Less unamortized debt discount and accrued final payment		(246	)
Carrying value of term loan, net		14,612

Note 7. Commitments

Operating Leases

The Company has lease arrangements for its facilities as follows.


Location	Approximate Square Feet	Operation	Expiration
Cupertino, CA	30,149 sq. ft.	Office, Laboratory and Manufacturing	Lease expires 2027 (with an option to renew for an additional five years)

Vacaville, CA	24,634 sq. ft.	Manufacturing	Lease expires 2028 (with an option to renew for an additional five years)

Under these leases, the Company is required to pay certain maintenance expenses in addition to monthly rent. Rent expense is recognized on a straight-line basis over the lease term for leases that have scheduled rental payment increases. The lease expense includes the amortization of the right-of-assets with the associated interest component estimated by applying the effective interest method. Rent expenses under all operating leases were $460,000 and $479,000 for the three months ended March 31, 2024 and 2023, respectively.

Future minimum payments under these noncancelable leases are as follows (in thousands):


	Operating Leases
Nine months ended December 31, 2024	$	1,032
2025		1,401
2026		1,443
2027		432
2028		227
	$	4,535

Note 8. Stockholders’ Equity

In July 2021, the Company filed a shelf registration statement on Form S-3 with the SEC (the “2021 Registration Statement”) (File No. 333-258333), which upon being declared effective in August 2021, allows the Company to offer up to $250.0 million of securities from time to time in one or more public offerings, inclusive of up to $75.0 million of shares of the Company’s common stock which the Company may sell, subject to certain limitations, pursuant to a sales agreement dated July 30, 2021 with Cantor Fitzgerald & Co. (the “2021 Sales Agreement”).

Registered Direct Offerings

February 2023 Financing

On February 3, 2023, the Company entered into a securities purchase agreement with two institutional investors relating to the purchase and sale of an aggregate of (i) 1,700,000 shares of its common stock, par value $0.0001 per share, (ii) pre-funded warrants to purchase 300,000 shares of common stock, and (iii) accompanying common warrants, to purchase an aggregate of 2,000,000 shares of Common Stock, in a registered direct offering (the "February Offering"). The issuance date of the common stock, the pre-funded warrants and the accompanying common warrants was February 8, 2023. The aggregate net proceeds to the Company from the February Offering were approximately $8.8 million after deducting $1.2 million in placement agent fees and other offering expenses, which were allocated to warrant liabilities and included in loss on issuance of warrants on the statement of operations for the twelve months ended December 31, 2023.

The pre-funded warrants were exercisable immediately following the closing date of the February Offering and have an unlimited term and an initial exercise price of $0.00001 per share. The common warrants were immediately exercisable and have a five-year term and an initial exercise price of $5.00 per share, which was lowered to $4.89 per share as a result of an anti-dilution provision in the common warrants issued in the February Offering that was triggered by the July Offering (as defined below) and then lowered to $0.51 that was triggered by the sale of our common stock in the open market in November 2023. The combined offering price was $5.00 per share and accompanying common warrant, or in the case of pre-funded warrants, $4.99999 per pre-funded warrant and accompanying common warrant. A holder (together with its affiliates) may not exercise any portion of a pre-funded warrant or common warrant to the extent that the holder would own more than 4.99% (or, at the election of the holder 9.99%) of the Company’s outstanding common stock immediately after exercise.

The Company accounts for the pre-funded warrants and the common warrants as current liabilities based upon the guidance of ASC 480 and ASC 815. The Company evaluated the common and pre-funded warrants under ASC 815-40, Derivatives and Hedging—Contracts in Entity’s Own Equity (“ASC 815-40”) and concluded that they do not meet the criteria to be classified in stockholders’ equity. Specifically, the exercise of the pre-funded warrants could be settled in cash upon the occurrence of a tender offer or exchange that involves 50% or more of the Company’s common stock. Because a change of 50% or more of the Company’s common stock may not result in a change in control of the Company, the Company believes that the scope exception related to the occurrence of a fundamental transaction in ASC 815-40 is not met. The common warrants have the same characteristics as the pre-funded warrants related to the occurrence of a fundamental transaction, therefore the common warrants are also precluded from equity classification. In addition, the holder of the common warrants is permitted to receive the highest volume weighted average price ("VWAP") from the date of announcement of the fundamental transaction through the date the holder provides notice of repurchase, as a way to protect the holder against reductions in the stock price in a fundamental transaction, while allowing the holder to keep the benefits of an upside, which precludes the common warrants from being considered indexed to the Company’s stock. Since the common and pre-funded warrants meet the definition of derivatives under ASC 815, the Company recorded these warrants as current liabilities on the balance sheet at the estimated fair value, with subsequent changes in their respective estimated fair values recognized in the statement of operations and comprehensive loss at each reporting date.

Estimating fair values of liability-classified financial instruments requires the development of estimates that may, and are likely to, change over the duration of the instrument with related changes in internal and external market factors. In addition, option-based techniques are highly volatile and sensitive to changes in the trading market price of the Company’s common stock. Because liability-classified financial instruments are initially and subsequently carried at fair value, the Company’s financial results will reflect the volatility in these estimate and assumption changes. Changes in estimated fair value are recognized as a component of other income (expense) in the statement of operations.

At the date of issuance, the Company valued the common warrants using a Monte-Carlo valuation model due to the presence of an alternative cashless settlement feature in the financing agreement that provides the warrant holders with an alternative settlement feature to receive a fixed percentage of the shares underlying the warrants for no consideration. Because this feature allows for the warrant holders to use an alternative mechanism to exercise their warrants in a manner that would yield different values, a Monte-Carlo valuation model was determined to be appropriate. The Monte-Carlo valuation resulted in an estimated fair value of the common warrants at issuance of $10.3 million. The pre-funded warrants were valued using the Black-Scholes option valuation model which is a common valuation method that is generally used for valuing warrants that are for the exercise of a fixed number of shares at a fixed exercise price per share. The Black-Scholes method was determined to be appropriate for the pre-funded warrants given the lack of alternative mechanisms to settle the warrants in a manner that would yield different values, such as an alternative cashless settlement feature. The Black-Scholes valuation resulted in an estimated fair value of the pre-funded warrants at issuance of $1.7 million.

Since the estimated fair value of the warrants at issuance was greater than the gross proceeds of $10.0 million received, the Company recorded approximately $2.0 million (i.e., the difference of the estimated fair values of the warrants and the gross proceeds received) as a loss on issuance of warrants on the statement of operations at issuance.

In September 2023, 1,400,000 shares of the common warrants were exercised in connection with the alternative cashless exercise of the warrants, the Company issued 924,000 shares to the holder. The Company recorded a gain of $3.4 million resulting from the exercise of the warrants in the accompanying statements of operations for the twelve months ended December 31, 2023 and recorded $2.8 million in additional-paid-in capital upon the issuance of the shares on the balance sheet as of December 31, 2023.

In November 2023, 300,000 shares of the pre-funded warrants were exercised in connection with the cashless exercise of the warrants, the Company issued 300,000 shares to the holder. The Company recorded a gain of $561,000 resulting from the exercise of the pre-funded warrants in the accompanying statements of operations for the twelve months ended December 31, 2023 and recorded $186,000 in additional-paid-in capital upon the issuance of the shares on the balance sheet as of December 31, 2023.

As of March 31, 2024 and December 31, 2023, common warrants to purchase 600,000 shares of the Company's common stock were outstanding with an exercise price of $0.51 per share. At March 31, 2024, the Company updated the estimated fair value of the outstanding common warrants using a Monte-Carlo valuation model resulting in an estimated fair value of $672,000, an increase of $360,000 for these common warrants at December 31, 2023.

As of March 31, 2024 and December 31, 2023, there were no pre-funded warrants outstanding.

The loss of $360,000 in common warrants and the gain of $2.5 million in common warrants and pre-funded warrants resulting from the change in the estimated fair value of the liabilities for such warrants was recorded as a change in the estimated fair value of warrant liabilities in the accompanying statements of operations and comprehensive loss for the three months ended March 31, 2024 and 2023, respectively.

The common warrant liability will be adjusted to estimated fair value at each balance sheet date until the warrants are settled. Changes in the estimated fair value of the warrant liabilities are recognized as a component of other income (expense), net in the statement of operations and comprehensive loss.

July 2023 Financing

On July 19, 2023, the Company entered into a securities purchase agreement with several institutional investors relating to the purchase and sale of an aggregate of (i) 2,991,027 shares of its common stock, par value $0.0001 per share, and (ii) accompanying common warrants to purchase an aggregate of 2,991,027 shares of Common Stock, in a registered direct offering (the “July Offering”). The issuance date of the common stock and the accompanying common warrants was July 21, 2023. The aggregate net proceeds to the Company from the July Offering were approximately $13.9 million after deducting $1.1 million in placement agent fees and other offering expenses.

The common warrants were immediately exercisable and have a five-year term and an initial exercise price of $4.89 per share. The combined offering price was $5.015 per share and accompanying common warrant. A holder (together with its affiliates) may not exercise any portion of the common warrants to the extent that the holder would own more than 4.99% (or, at the election of the holder 9.99%) of the Company’s outstanding common stock immediately after exercise.

The common stock and common warrants are separate freestanding instruments. The estimated fair value of the common stock issued in the July Offering as of the date of issuance (i.e., July 21, 2023) was $9.1 million, which was the number of shares of 2,991,027 multiplied by the price per share as of the date of issuance of $3.05 per share. The common stock issued in the July Offering was classified as equity on the Company’s balance sheet. The Company allocated the offering expenses related to the July 2023 offering of $1.1 million based on the relative fair values of common stock and common warrants issued. The Company recognized an expense for the amount allocated to the common warrants of $427,000 (included within other expense, net) upon the closing of the July Offering in the twelve months ended December 31, 2023. The Company recorded the amount allocated to the common stock of $673,000 as a reduction in additional paid-in capital on its balance sheets as of December 31, 2023.

The Company accounted for the common warrants issued in the July Offering as current liabilities based upon the guidance of ASC 815. The Company evaluated the common warrants under ASC 815-40, Derivatives and Hedging—Contracts in Entity’s Own Equity (“ASC 815-40”) and concluded that they do not meet the criteria to be classified in stockholders’ equity. Upon a fundamental transaction, holders of the common warrants are permitted to settle warrants for a value determined using the Black Scholes formula that incorporates a leveraged common stock price. Specifically, for purposes of the calculation, the stock price is determined as the higher of the VWAP measured over the period from the date of announcement of the fundamental transaction through the date the holder provides notice of repurchase, and the value received by common stockholders in such fundamental transaction. This in effect protects the holder against reductions in the stock price that may result from a fundamental transaction, while allowing the holder to keep the benefits of an upside. This feature precludes the common warrants from being considered indexed to the Company’s stock.

Since the common warrants meet the definition of derivatives under ASC 815, the Company recorded these warrants as current liabilities on the balance sheet at the estimated fair value, with subsequent changes in their respective estimated fair values recognized in the statement of operations and comprehensive loss at each reporting date.

The Company valued the common warrants issued in the July Offering using the Black-Scholes option valuation model. The Black-Scholes method was determined to be appropriate given the lack of alternative mechanisms to settle the warrants in a manner that would yield different values, such as an alternative cashless settlement feature. The estimated fair value of these warrants as of the issuance date and as of December 31, 2023 were $5.8 million and $912,000, respectively.

As of March 31, 2024 and December 31, 2023, none of the warrants issued in the July Offering have been exercised. Common warrants to purchase 2,991,027 shares of the Company's common stock were outstanding with an exercise price of $4.89 per share. At March 31, 2024, the Company updated the estimated fair value of the outstanding common warrants using a Monte-Carlo valuation model resulting in an estimated fair value of $2.3 million, an increase of $1.4 million for these common warrants at December 31, 2023. The loss of $1.4 million resulting from the change in the estimated fair value of the liabilities for the warrants was recorded as a change in the estimated fair value of warrant liabilities in the accompanying statements of operations and comprehensive loss for the three months ended March 31, 2024.

ATM Financings

During the three months ended March 31, 2024, the Company raised net proceeds (net of commissions) of approximately $648,000 from the sale of 702,090 shares of the Company’s common stock in the open market at a weighted average price of $0.94 per share pursuant to the 2021 Registration Statement and the 2021 Sales Agreement. During the three months ended March 31, 2023, there were no sales of the Company's common stock in the open market.

As of May 9, 2024, the Company had up to $222.7 million of the Company’s securities available for sale under the 2021 Registration Statement, of which $72.7 million of the Company’s common stock are available pursuant to the 2021 Sales Agreement.

Note 9. Subsequent Events

None.

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

This Management’s Discussion and Analysis of Financial Condition and Results of Operations for the three months ended March 31, 2024 should be read in conjunction with (i) our unaudited condensed financial statements and related notes appearing elsewhere in this Quarterly Report on Form 10-Q and (ii) our Annual Report on Form 10-K for the year ended December 31, 2023 filed with the Securities and Exchange Commission (“SEC”) on March 28, 2024 as well as Part I, Item 1A., “Risk Factors” section included therein and any additional risk factors that may be described herein or in our subsequent reports filed with the SEC. References to the “Company,” “DURECT,” “we,” “us” and “our” refer to DURECT Corporation.

Overview

We are a biopharmaceutical company advancing novel and potentially lifesaving investigational therapies derived from our Epigenetic Regulator Program. Larsucosterol, a new chemical entity in clinical development, is the lead candidate in our Epigenetic Regulator Program. An endogenous, orally bioavailable small molecule, larsucosterol has been shown in both in vitro and in vivo studies to play an important regulatory role in lipid metabolism, stress and inflammatory responses, and cell death and survival. We are developing larsucosterol for alcohol-associated hepatitis (“AH”), a life-threatening acute liver condition with no approved therapeutics and a 28-Day and 90-Day historical mortality rate of 20%-26% and 29%-31%, respectively. After completing a Phase 2a trial in which 100% of AH patients treated with larsucosterol survived the 28-Day study period, we conducted a double-blind, placebo-controlled Phase 2b clinical trial called AHFIRM (trial in AH to evaluate saFety and effIcacy of laRsucosterol treatMent). Through our AHFIRM trial, we evaluated larsucosterol’s potential to reduce mortality or liver transplantation compared to a placebo with or without steroids at the investigators’ discretion. In total, we enrolled 307 patients at leading hospitals in the U.S., Australia, E.U. and U.K. In November 2023, we announced topline data from the AHFIRM trial that showed a compelling efficacy signal in favor of larsucosterol in the key secondary endpoint of mortality at 90 days. Both the 30 mg and 90 mg larsucosterol doses demonstrated clinically meaningful trends in reduction of mortality at 90 days with mortality reductions of 41% (p=0.068) in the 30 mg arm and 35% (p=0.124) in the 90 mg arm compared with placebo. The numerical improvement in the primary endpoint of mortality or liver transplant at 90 days did not achieve statistical significance for either dose of larsucosterol. Both doses of larsucosterol in AHFIRM showed a more pronounced reduction in mortality in patients enrolled in the U.S., representing 76% of patients enrolled in the trial. The reductions in mortality at 90 days were 57% (p=0.014) in the 30 mg arm and 58% (p=0.008) in the 90 mg arm compared with placebo in the U.S. Larsucosterol was safe and well tolerated. There were fewer treatment-emergent adverse events ("TEAEs") in the larsucosterol arms compared with placebo. During a Type C meeting with the FDA, we received feedback on the recommendations for a Phase 3 clinical trial for larsucosterol in AH that could support a potential New Drug Application filing. We are in the process of designing a planned registrational Phase 3 clinical trial based on the FDA feedback and the results from our completed Phase 2b AHFIRM clinical trial. We have also investigated larsucosterol in patients with metabolic dysfunction-associated steatohepatitis (“MASH”), also known as non-alcoholic steatohepatitis or NASH with encouraging results in a Phase 1b clinical trial and may consider further development of larsucosterol for this and other indications.

In addition to our Epigenetic Regulator Program, we developed a novel and proprietary post-surgical pain product called POSIMIR® that utilizes our innovative SABER® platform technology to enable continuous sustained delivery of bupivacaine, a non-opioid local analgesic, over three days in adults. In February 2021, POSIMIR received FDA approval for post-surgical pain reduction for up to 72 hours following arthroscopic subacromial decompression. In December 2021, we entered into a license agreement (the “Innocoll Agreement”) with Innocoll Pharmaceuticals Limited (“Innocoll”), pursuant to which the Company granted to Innocoll an exclusive, royalty-bearing, sublicensable right and license to develop, manufacture and commercialize POSIMIR in the United States. In September 2022, Innocoll launched POSIMIR in the U.S.

As a result of the assignment of certain patent rights, we also receive single digit sales-based earn-out payments from U.S. net sales of Indivior UK Limited (“Indivior”)’s PERSERIS® (risperidone) drug for schizophrenia and single-digit royalties from net sales of Orient Pharma Co., Ltd. (“Orient Pharma”)’s Methydur Sustained Release Capsules (“Methydur”) for the treatment of attention deficit hyperactivity disorder (“ADHD”) in Taiwan. We also manufacture and sell ALZET® osmotic pumps used in laboratory research.

NOTE: POSIMIR® is a trademark of Innocoll Pharmaceuticals, Ltd. in the U.S. and a trademark of DURECT Corporation outside of the U.S. SABER® and ALZET® are trademarks of DURECT Corporation. Other trademarks referred to belong to their respective owners. Full prescribing information for POSIMIR, including BOXED WARNING and Medication Guide can be found at www.posimir.com. Full prescribing information for PERSERIS, including BOXED WARNING and Medication Guide can be found at www.perseris.com.

Collaborative Research and Development and Other Revenue

Collaborative research and development and other revenue consists of three broad categories: (a) the recognition of upfront license payments over the period of our continuing involvement with the third party, (b) the reimbursement of qualified research expenses by third parties, (c) milestone payments in connection with our collaborative agreements and (d) royalties and earn-out payments from our agreements with third parties.

Product Revenues

We also currently generate product revenue from the sale of two product lines:

•

ALZET® osmotic pumps which are used for animal research; and

•

certain key excipients that are included in Methydur and one excipient that is included in POSIMIR and in a marketed animal health product.

Because we consider our core business to be developing and commercializing pharmaceuticals, we do not intend to significantly increase our investments in or efforts to sell or market any of our existing product lines. However, we expect that we will continue to make efforts to increase our revenues related to collaborative research and development by entering into new collaborations.

Operating Results

Since our inception in 1998, we have generally had a history of operating losses. At March 31, 2024, we had an accumulated deficit of $596.6 million. Our net losses were $7.6 million for the three months ended March 31, 2024 compared with $12.0 million for the corresponding period in 2023. These losses have resulted primarily from costs incurred to research and develop our product candidates and, to a lesser extent, from selling, general and administrative costs associated with our operations and product sales. We expect our research and development expenses in the near future to decrease compared to the first quarter of 2024 as we have completed the AHFIRM trial, have reduced our research and development staff, and are evaluating our research and development spending plans. We expect our selling, general and administrative expenses in the near future to decrease compared to the first quarter of 2024 due to lower consulting and employee expenses. We expect to incur continuing losses and negative cash flows from operations for the foreseeable future. As disclosed in the “Liquidity and Capital Resources” section, we have concluded that substantial doubt exists about our ability to continue as a going concern for a period of at least 12 months from the date of issuance of these financial statements.

Critical Accounting Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenues and expenses during the reporting periods. The most significant accounting estimates and assumptions relate to revenue recognition, prepaid and accrued clinical costs, prepaid and accrued manufacturing costs and valuation of warrant liabilities. Actual amounts could differ significantly from these estimates. There have been no material changes to our other critical accounting estimates as compared to the disclosures in our Annual Report on Form 10-K for the year ended December 31, 2023.

Results of Operations

Three months ended March 31, 2024 and 2023

Collaborative research and development and other revenue

We recognize revenue from collaborative research and development activities and service contracts. We expect our collaborative research and development and other revenue to fluctuate in future periods pending our efforts to enter into potential new collaborations and any royalty or earn-out revenue recognized from collaborators or counterparties.

The collaborative research and development and other revenue associated with our major collaborators or counterparties were $496,000 for the three months ended March 31, 2024, compared with $643,000 for the corresponding period in 2023. The collaborative research and development and other revenue included (a) amounts related to earn-out revenue from Indivior UK Limited (Indivior) with respect to PERSERIS net sales; (b) feasibility programs and research and development activities funded by our collaborators and (c) royalty revenue from Orient Pharma with respect to Methydur net sales.

The decrease in collaborative research and development and other revenue in the three months ended March 31, 2024 compared with the corresponding period in 2023 was primarily due to lower revenue recognized from the feasibility agreements with other companies.

Product revenue, net

A portion of our revenues is derived from product sales, which include our ALZET osmotic pump product line and certain excipients that are included in POSIMIR, Methydur and in a marketed animal health product. Net product revenues were $1.3 million for the three months ended March 31, 2024 compared with $1.4 million for the corresponding period in 2023. The decrease in the three months ended March 31, 2024 was primarily attributable to lower revenue from our ALZET osmotic pump product line as a result of lower units sold and lower revenue from certain excipients that are included in Methydur and in a marketed animal health product compared to the corresponding period in 2023.

Cost of product revenues

Cost of product revenues was $289,000 for the three months ended March 31, 2024 compared with $388,000 for the corresponding period in 2023. The decrease in the three months ended March 31, 2024 was primarily due to lower units sold from our ALZET product line compared with the corresponding period in 2023. Stock-based compensation expense recognized related to cost of product revenues was $4,000 for the three months ended March 31, 2024 and 2023, respectively.

As of March 31, 2024, we had 9 manufacturing employees compared with 10 as of March 31, 2023. As of May 9, 2024, we had 8 manufacturing employees.We expect the number of employees involved in manufacturing will remain consistent in the near future.

Research and development

Research and development expenses are primarily comprised of salaries, benefits, stock-based compensation and other compensation costs associated with research and development personnel, overhead and facility costs, preclinical and non-clinical development costs, clinical trial and related clinical manufacturing costs, contract services, and other outside costs.

Research and development expenses were $4.1 million for the three months ended March 31, 2024 compared to $8.6 million for the corresponding period in 2023. We incurred lower research and development costs associated with larsucosterol, the depot injectable programs as well as other research programs in the three months ended March 31, 2024 compared to the corresponding period in 2023, as more fully discussed below. Stock-based compensation expense recognized related to research and development personnel was $212,000 for the three months ended March 31, 2024 compared to $292,000 for the corresponding period in 2023. As of March 31, 2024, we had 26 research and development employees compared with 40 as of March 31, 2023. As of May 9, 2024, we had 18 research and development employees. We expect research and development expenses in the near future to decrease compared to the first quarter of 2024 as we have completed the AHFIRM trial, have reduced our research and development staff, and are evaluating our research and development spending plans.


	Three months ended March 31,
	2024		2023
Larsucosterol	$	4,045	$	7,515
Depot injectable programs		2		316
Others		72		762
Total research and development expenses	$	4,119	$	8,593

Larsucosterol

Our research and development expenses for larsucosterol were $4.0 million in the three months ended March 31, 2024 compared to $7.5 million for the corresponding period in 2023. The decrease in the three months ended March 31, 2024 was primarily due to lower clinical trial related expenses as we completed the AHFIRM trial and lower employee-related costs for this drug candidate compared with the corresponding period in 2023.

Depot injectable programs

Our research and development expenses for the depot injectable programs were $2,000 in the three months ended March 31, 2024 compared to $316,000 for the corresponding period in 2023. The decrease in the three months ended March 31, 2024 was primarily due to lower employee-related costs and lower outside expenses for these programs compared with the corresponding period in 2023.

Other DURECT research programs

Our research and development expenses for all other programs were $72,000 in the three months ended March 31, 2024 compared to $762,000 for the corresponding period in 2023. The decrease in the three months ended March 31, 2024 was primarily due to lower employee-related costs and lower outside expenses associated with these programs compared with the corresponding period in 2023.

Our research and development programs may span as many as ten years or more, and estimation of completion dates or costs to complete are highly speculative and subjective due to numerous risks and uncertainties associated with developing pharmaceutical products, including significant and changing government regulation, uncertainties of future preclinical and clinical study results, uncertainties with our collaborators’ commitment to and progress in the programs and uncertainties associated with process development and manufacturing as well as sales and marketing. In addition, with respect to our development programs subject to third-party collaborations, the timing and expenditures to complete the programs are subject to the control of our collaborators. Therefore, we cannot reasonably estimate the timing and costs of the efforts necessary to complete the research and development programs. For additional information regarding these risks and uncertainties, see Part I, Item 1A., “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on March 28, 2024, and any additional risk factors that may be described herein or in our subsequent reports filed with the SEC.

Selling, general and administrative. Selling, general and administrative expenses are primarily comprised of salaries, benefits, stock-based compensation and other compensation costs associated with finance, legal, business development, sales and marketing and other administrative personnel, overhead and facility costs, and other general and administrative costs.

Selling, general and administrative expenses were $3.1 million in the three months ended March 31, 2024 compared to $4.1 million for the corresponding period in 2023. The decrease in the three months ended March 31, 2024 was primarily due to lower market research expenses, lower patent expenses as well as lower employee costs compared to the corresponding period in 2023. Stock-based compensation expense recognized related to selling, general and administrative personnel was $293,000 for the three months ended March 31, 2024 compared to $306,000 for the corresponding period in 2023.

We had 23 selling, general and administrative employees as of March 31, 2024 compared with 25 as of March 31, 2023. As of May 9, 2024, we had 22 selling, general and administrative employees. We expect selling, general and administrative expenses in the near future to decrease compared to the first quarter of 2024 as a result of lower consulting and employee expenses.

Other income (expense). Other expense was $1.9 million in the three months ended March 31, 2024 compared to $965,000 for the corresponding period in 2023.

Interest and other income

Interest income was $321,000 in the three months ended March 31, 2024 compared to $517,000 for the corresponding period in 2023. The decrease in the three months ended March 31, 2024 was primarily due to lower balances in our cash, cash equivalents and investments compared with the corresponding period in 2023.

Interest expense

Interest expense was $529,000 in the three months ended March 31, 2024 compared to $726,000 for the corresponding period in 2023. The decrease in the three months ended March 31, 2024 was primarily due to lower principal balance on our term loan compared with the corresponding period in 2023.

Change in fair value of warrant liabilities

The change in fair value of warrant liabilities during the three months ended March 31, 2024 was comprised of a non-cash loss of $360,000 for the common warrants issued in February 2023 and a non-cash loss of $1.4 million for the common warrants issued in July 2023. The change in fair value of warrant liabilities during the three months ended March 31, 2023 was comprised of a non-cash gain of $384,000 for the pre-funded warrants issued in February 2023 and a non-cash gain of $2.1 million for the common warrants issued in February 2023.

Issuance cost for warrants

The issuance cost for warrants was zero and $1.2 million in the three months ended March 31, 2024 and 2023, respectively. The issuance cost for warrants in three months ended March 31, 2023 was comprised of $1.2 million for the warrants issued in February 2023.

Loss on issuance of warrants

Loss on issuance of warrants was zero and $2.0 million in the three months ended March 31, 2024 and 2023, respectively. The loss on issuance of warrants during the three months ended March 31, 2023 was comprised of $2.0 million for the warrants issued in February 2023.

Liquidity and Capital Resources

We had cash, cash equivalents and investments totaling $21.6 million at March 31, 2024 compared to cash, cash equivalents, and investments of $29.8 million at December 31, 2023. These balances include $150,000 of interest-bearing marketable securities classified as restricted investments on our balance sheets as of March 31, 2024 and December 31, 2023. The decrease in cash, cash equivalents and investments was primarily due to cash used in ongoing operating activities and principal and interest payments on the term loan, partially offset by net proceeds of $648,000 from the sale of our common stock in the open market pursuant to the 2021 Sales Agreement (as defined and described below) and payments received from collaboration partners and customers. For more information on our registered direct offerings that took place in February and July 2023, see Note 8 “Stockholders’ Equity—Registered Direct Offerings” to our unaudited condensed financial statements included in this Quarterly Report on Form 10-Q.

Our cash and investments policy emphasizes liquidity and preservation of principal over other portfolio considerations. We select investments that maximize interest income to the extent possible given these two constraints. We satisfy liquidity requirements by investing excess cash in securities with different maturities to match projected cash needs and limit concentration of credit risk by diversifying our investments among a variety of high credit-quality issuers.

As discussed below, we do not have sufficient cash resources to fund our planned operations, existing debt and contractual commitments and planned capital expenditures. Our auditors have issued a going concern opinion. Unless we secure additional equity or debt financing, of which there can be no assurance, we may not be able to continue operations.

Cash Flows

We used $6.8 million of cash in operating activities for the three months ended March 31, 2024 compared to $9.3 million for the corresponding period in 2023. The decrease in cash used in operating activities was primarily due to lower costs incurred to research and develop our product candidates and, to a lesser extent, from selling, general and administrative costs associated with our operations and product sales, partially offset by lower payments from our collaborators. The cash used in operations was primarily to fund operations as well as our working capital requirements. We anticipate that cash used in operating activities in the near future will decrease compared to the first quarter of 2024 due to expected decreases in operating expenses.

We used $887,000 of cash in investing activities for the three months ended March 31, 2024 compared to $4.9 million for the corresponding period in 2023. The decrease in cash used by investing activities was primarily due to a decrease in net purchases of available-for-sale securities for the three months ended March 31, 2024 compared with the corresponding period in 2023.

We used $1.5 million of cash in financing activities for the three months ended March 31, 2024 compared to receiving $10.0 million of cash from financing activities for the three months ended March 31, 2023. The decrease in cash received from financing activities was primarily due to no cash proceeds received from registered direct financings during the quarter and higher principal payments on the term loan with Oxford Finance LLC ("Oxford Finance") during the three months ended March 31, 2024 compared with the corresponding period in 2023.

Shelf Registration Statement

In July 2021, we filed a shelf registration statement on Form S-3 with the SEC (the “2021 Registration Statement”) (File No. 333-258333), which upon being declared effective in August 2021, terminated our registration statement filed in August 2018 (File No. 333-226518) and allowed us to offer up to $250.0 million of securities from time to time in one or more public offerings, inclusive of up to $75.0 million of shares of our common stock which we may sell, subject to certain limitations, pursuant to the 2021 Sales Agreement. The 2021 Registration Statement expires in August 2024. In addition, due to the SEC’s “baby shelf” rules, which prohibit companies with a public float of less than $75 million from issuing securities under a shelf registration statement in excess of one-third of such company’s public float in a 12-month period, we are currently only able to issue a limited number of shares under our 2021 Registration Statement, which aggregate to no more than one-third of our public float.

During the three months ended March 31, 2024, we raised net proceeds (net of commissions) of approximately $648,000 from the sale of our common stock in the open market under the 2021 Sales Agreement.

As of March 31, 2024, we had up to $222.7 million of our securities available for sale under the 2021 Registration Statement, of which $72.7 million of our common stock are available pursuant to the 2021 Sales Agreement. However, due to the SEC’s “baby shelf” rules discussed above, only up to $12.4 million of our securities are available for sale under the 2021 Registration Statement of which $12.4 million of our common stock are available pursuant to the 2021 Sales Agreement.

Any material sales in the public market of our common stock, under the 2021 Sales Agreement or otherwise under the 2021 Registration Statement, could adversely affect prevailing market prices for our common stock.

Term Loan

In July 2016, we entered into a Loan and Security Agreement (as amended, the "Loan Agreement") with Oxford Finance, pursuant to which Oxford Finance provided a $20.0 million secured single-draw term loan to us with an initial maturity date of August 1, 2020. The term loan was fully drawn at close and the proceeds were used for working capital and general business requirements. Following five amendments, we made interest only payments under the amended Loan Agreement until June 1, 2023, and are making consecutive monthly payments of principal and interest in arrears to be paid through September 1, 2025, the final maturity date of the term loan. The Loan Agreement provides for a floating interest rate (7.95% initially and 12.73% as of March 31, 2024) based on an index rate plus a spread and an additional payment equal to 10% of the principal amount of the term loan, which is due when the term loan becomes due or upon the prepayment of the facility. If we elect to prepay the term loan, there is also a prepayment fee between 0.75% and 2.5% of the principal amount of the term loan depending on the timing of prepayment. Our debt repayment obligations under the Loan Agreement may prove a burden to the Company as they become due, particularly following the expiration of the interest-only period.

The term loan is secured by substantially all of our assets, except that the collateral does not include any intellectual property (including licensing, collaboration and similar agreements relating thereto), and certain other excluded assets. The Loan Agreement contains customary representations, warranties and covenants by us, which covenants limit our ability to convey, sell, lease, transfer, assign or otherwise dispose of certain assets; engage in any business other than the businesses currently engaged in by us or reasonably related thereto; liquidate or dissolve; make certain management changes; undergo certain change of control events; create, incur, assume, or be liable with respect to certain indebtedness; grant certain liens; pay dividends and make certain other restricted payments; make certain investments; and make payments on any subordinated debt.

The Loan Agreement also contains customary indemnification obligations and customary events of default, including, among other things, our failure to fulfill certain obligations under the 2016 Loan Agreement and the occurrence of a material adverse change which is defined as a material adverse change in our business, operations, or condition (financial or otherwise), a material impairment of the prospect of repayment of any portion of the term loan, or a material impairment in the perfection or priority of lender’s lien in the collateral or in the value of such collateral. In the event of default by us under the 2016 Loan Agreement, the lender would be entitled to exercise its remedies thereunder, including the right to accelerate the debt, upon which we may be required to repay all amounts then outstanding under the Loan Agreement. As a result, the term loan was reclassified to current liabilities from non-current liabilities on our balance sheet as of March 31, 2024 and December 31, 2023 due to recurring losses, liquidity concerns and a subjective acceleration clause in the Loan Agreement.

Going Concern

As of March 31, 2024, we had cash, cash equivalents and investments totaling $21.6 million compared to cash, cash equivalents, and investments of $29.8 million at December 31, 2023. In the three months ended March 31, 2024, we raised net proceeds (net of commissions) of approximately $648,000 from the sale of our common stock in the open market under the 2021 Sales Agreement.

In accordance with ASU No. 2014-15 Presentation of Financial Statements – Going Concern (subtopic 205-40), our management evaluates whether there are conditions or events, considered in the aggregate, that raise substantial doubt about our ability to continue as a going concern within one year after the date that the financial statements are issued. Based on our evaluation, substantial doubt exists regarding our ability to continue as a going concern for a period of one year from the issuance of our financial statements.

Presently, we do not have sufficient cash resources to fund our planned operations, existing debt and contractual commitments and planned capital expenditures through at least the next 12 months from issuance of these financial statements. We may consume available resources more rapidly than currently anticipated, resulting in the need for additional funding. We expect to incur continuing losses and negative cash flows from operations for the foreseeable future.

We may decide to raise additional capital through a variety of sources in the short-term and in the long-term, including but not limited to:

•

the public equity markets;

•

private equity financings;

•

collaborative arrangements;

•

asset sales; and/or

•

public or private debt.

There can be no assurance that we will enter into additional collaborative agreements or maintain existing collaborative agreements, will earn collaborative revenues or that additional capital will be available on favorable terms to the Company, if at all. If adequate funds are not available, we may be required to significantly reduce or re-focus our operations or to obtain funds through arrangements that may require us to relinquish rights to certain of our products, technologies or potential markets, either of which could have a material adverse effect on our business, financial condition and results of operations. To the extent that additional capital is raised through the sale of equity or convertible debt securities, the issuance of such securities would result in ownership dilution to our existing stockholders (assuming convertible debt securities were converted into shares). These factors raise substantial doubt regarding our ability to continue as a going concern. Our inability to obtain required funding in the near future or our inability to obtain funding on favorable terms will have a material adverse effect on our operations and strategic development plan for future growth. If we cannot successfully raise additional capital and implement our strategic development plan, our liquidity, financial condition and business prospects will be materially and adversely affected, and we may have to cease operations.

As a result, our independent registered public accounting firm included an explanatory paragraph in its report on our financial statements as of, and for the year ended, December 31, 2023.

During the three months ended March 31, 2024, there were no significant changes in our commercial commitments and contractual obligations as compared with the information presented in our Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on March 28, 2024.

Human Capital

As of May 9, 2024, we had 48 employees, including 18 in research and development, 8 in manufacturing and 22 in selling, general and administrative.

Item 3. Quantitative and Qualitative Disclosures about Market Risk

As of March 31, 2024, our exposure to market risk has not changed materially since December 31, 2023. For more information on financial market risks related to changes in interest rates, reference is made to Part II, Item 7A., “Quantitative and Qualitative Disclosures About Market Risk” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on March 28, 2024.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures: The Company’s principal executive and principal financial officers reviewed and evaluated the Company’s disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on that evaluation, the Company’s principal executive and principal financial officers concluded that as of the end of the period covered by this Quarterly Report on Form 10-Q the Company’s disclosure controls and procedures are effective at ensuring that information required to be disclosed by the Company in reports that the Company files or submits under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms, and is accumulated and communicated to management, including the Company’s principal executive officer and principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting: There were no significant changes in the Company’s internal control over financial reporting (as defined in Exchange Act Rule 13a-15(f)) during the Company’s most recently completed fiscal quarter that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

PART II – OTHER INFORMATION

Item 1. Legal Proceedings

We are not a party to any material legal proceedings.

Item 1A. Risk Factors.

You should carefully consider the factors discussed in Part I, Item 1A., “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, filed with the SEC on March 28, 2024, which could materially affect our business, financial position, or future results of operations. The risks described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial position, or future results of operations. We may disclose changes to such factors or disclose additional factors from time to time in our future filings with the SEC. The risk factor set forth below supplements and updates the risk factors previously disclosed and should be read together with the risk factors described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 and with any risk factors we may include in subsequent periodic filings with the SEC.

We will require and may have difficulty or be unsuccessful in raising needed capital in the future to continue to operate as a going concern

Our business currently does not generate sufficient revenues to meet our capital requirements and we do not expect that it will do so in the near future. We have expended and will continue to expend substantial funds to conduct the research, development, manufacturing and clinical testing of larsucosterol.

Presently, we do not have sufficient cash resources to meet our plans for the next twelve months from the issuance of the financial statements included herein. Our recurring losses from operations, negative cash flows and need for additional capital raise substantial doubt about our ability to continue as a going concern. As a result, our independent registered public accounting firm included an explanatory paragraph in its report on our financial statements as of, and for the year ended, December 31, 2023. We will require additional financing to fund our operations or we will have to significantly curtail or discontinue our operations to conserve our capital resources. Additional funds may not be available on acceptable terms, if at all, and such availability will depend on a number of factors, some of which are outside of our control, including general capital markets conditions and investors’ view of our prospects and valuation. In addition, our ability to raise capital in the public capital markets, including through the 2021 Sales Agreement, may be limited by, among other things, SEC rules and regulations impacting the eligibility of smaller companies to use Form S-3 for primary offerings of securities. Based on our public float, as of the date of the filing of this Quarterly Report on Form 10-Q, we are only permitted to utilize the shelf registration statement subject to Instruction I.B.6. to Form S-3, which is referred to as the “baby shelf” rule. For so long as our public float is less than $75 million, we may not sell more than the equivalent of one-third of our public float during any 12 consecutive months pursuant to the baby shelf rules. Although alternative public and private transaction structures may be available, these may require additional time and cost, may impose operational restrictions on us, and may not be available on attractive terms. Further, investors’ perception of our ability to continue as a going concern may make it more difficult for us to obtain financing, or necessitate that we obtain financing on terms that are more favorable to investors, and could result in the loss of confidence by investors, suppliers and employees. Our continued operations are contingent on our ability to raise additional capital or license or otherwise monetize our assets. If we do not acquire sufficient additional funding or alternative sources of capital to meet our working capital needs, we will have to substantially curtail or discontinue our operations, resulting in delays in the development of larsucosterol and in generating revenue.

Our actual capital requirements will depend on many factors, including:

•

continued progress and cost of our research and development programs;

•

progress with preclinical studies and clinical trials, including a Phase 3 clinical trial for larsucosterol in AH;

•

the time and costs involved in obtaining regulatory approvals, if any;

•

costs involved in establishing manufacturing capabilities for pre-clinical, non-clinical, clinical and commercial quantities of our product candidates;

•

success in entering into collaboration agreements and achieving milestones under such agreements;

•

regulatory actions with respect to our products and product candidates;

•

costs involved in preparing, filing, prosecuting, maintaining, defending and enforcing intellectual property rights;

•

costs of developing sales, marketing and distribution channels and our ability and that of our collaborators to sell our products, products we have a financial interest in and, eventually, product candidates;

•

competing technological and market developments;

•

market acceptance of our products, products we have a financial interest in and, eventually, product candidates;

•

any failure to comply with the covenants in our debt instruments that results in acceleration of repayment obligations;

•

costs for recruiting and retaining employees and consultants; and

•

unexpected legal, accounting and other costs and liabilities related to our business.

We may consume available resources more rapidly than currently anticipated, resulting in the need for additional funding. For example, we do not currently have sufficient funding to complete a Phase 3 trial of larsucosterol. We may seek to raise additional funds through equity or debt financings, convertible debt financings, collaborative arrangements with corporate collaborators or other sources, which, in each case, may be dilutive to existing stockholders and may cause the price of our common stock to decline. In addition, in the event that additional funds are obtained through arrangements with collaborators or other sources, we may have to relinquish rights to some of our technologies, products or product candidates that we would otherwise seek to develop or commercialize ourselves.

Item 5. Other Information

Insider Adoption or Termination of Trading Arrangements

During the fiscal quarter ended March 31, 2024, none of our directors or officers informed us of the adoption or termination of a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as those terms are defined in Regulation S-K, Item 408.

Item 6. Exhibits


Exhibit Number		Exhibit Name

31.1*	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Exchange Act as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

31.2*	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) and Rule 15d-14(a) of the Exchange Act as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1**	Certification of Chief Executive Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

32.2**	Certification of Chief Financial Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

101	The following financial statements from the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2024, formatted in Inline XBRL: (i) Condensed Balance Sheets, (ii) Condensed Statements of Operations, (iii) Condensed Statements of Comprehensive Income, (iv) Condensed Statements of Changes in Stockholders' Equity, (v) Condensed Statements of Cash Flows and (vi) Notes to Condensed Financial Statements, tagged as blocks of text and including detailed tags.

104	The cover page from the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2023, formatted in Inline XBRL (included as Exhibit 101).

* Filed herewith.

** Furnished, not filed.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.


	DURECT CORPORATION

	By:	/S/ JAMES E. BROWN
		James E. Brown Chief Executive Officer

Date: May 14, 2024

	By:	/S/ TIMOTHY M. PAPP
		Timothy M. Papp Chief Financial Officer (Principal Accounting Officer)

Date: May 14, 2024

Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, James E. Brown, certify that:

1. I have reviewed this quarterly report on Form 10-Q of DURECT Corporation for the quarter ended March 31, 2024;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent function):

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

May 14, 2024

    /S/ JAMES E. BROWN

   

    James E. Brown

   

    Chief Executive Officer

   

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Timothy M. Papp, certify that:

1. I have reviewed this quarterly report on Form 10-Q of DURECT Corporation for the quarter ended March 31, 2024;

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

May 14, 2024

    /S/ TIMOTHY M. PAPP

   

    Timothy M. Papp

   

    Chief Financial Officer
 (Principal Accounting Officer)

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of DURECT Corporation (the “Company”) on Form 10-Q for the period ending March 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, James E. Brown, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

May 14, 2024

    /S/ JAMES E. BROWN

   

    James E. Brown

   

    Chief Executive Officer

   

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of DURECT Corporation (the “Company”) on Form 10-Q for the period ending March 31, 2024 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Timothy M. Papp, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

May 14, 2024

    /S/ TIMOTHY M. PAPP

   

    Timothy M. Papp

   

    Chief Financial Officer
(Principal Accounting Officer)

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2024	May 09, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Title of 12(b) Security	Common Stock $0.0001 par value per share
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Trading Symbol	DRRX
Entity Registrant Name	DURECT CORP
Entity Central Index Key	0001082038
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		31,039,381
Entity Shell Company	false
Entity Incorporation, State or Country Code	DE
Entity File Number	000-31615
Entity Tax Identification Number	94-3297098
Entity Address, Address Line One	10240 Bubb Road
Entity Address, City or Town	Cupertino
Entity Address, State or Province	CA
Entity Current Reporting Status	Yes
Entity Address, Postal Zip Code	95014
City Area Code	408
Local Phone Number	777-1417
Document Quarterly Report	true
Document Transition Report	false

Condensed Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 19,252	$ 28,400
Short-term investments	2,187	1,280
Accounts receivable, net	1,020	1,261
Inventories, net	2,398	2,219
Prepaid expenses and other current assets	1,228	1,511
Total current assets	26,085	34,671
Property and equipment, net	58	91
Operating lease right-of-use assets	3,631	3,980
Goodwill	6,169	6,169
Long-term restricted investments	150	150
Other long-term assets	128	128
Total assets	36,221	45,189
Current liabilities:
Accounts payable	782	1,777
Accrued liabilities	5,105	5,966
Term loan, current portion, net	14,612	16,663
Operating lease liabilities, current portion	1,298	1,381
Warrant liabilities	2,942	1,224
Total current liabilities	24,739	27,011
Operating lease liabilities, non-current portion	2,466	2,702
Other long-term liabilities	716	693
Commitments and contingencies
Stockholders’ equity:
Common stock	23	23
Additional paid-in capital	604,936	603,780
Accumulated other comprehensive loss	(10)	(14)
Accumulated deficit	(596,649)	(589,006)
Stockholders’ equity	8,300	14,783
Total liabilities and stockholders’ equity	$ 36,221	$ 45,189

Condensed Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Total revenues	$ 1,827,000	$ 2,054,000
Operating expenses:
Cost of product revenues	$ 289,000	$ 388,000
Type of cost, good or service [extensible list]	Product Revenue, Net [Member]	Product Revenue, Net [Member]
Research and development	$ 4,119,000	$ 8,593,000
Selling, general and administrative	3,136,000	4,095,000
Total operating expenses	7,544,000	13,076,000
Loss from operations	(5,717,000)	(11,022,000)
Other income (expense):
Interest and other income	321,000	517,000
Interest and other expenses	(529,000)	(726,000)
Change in fair value of warrant liabilities	(1,718,000)	2,477,000
Issuance cost for warrants		(1,200,000)
Loss on issuance of warrants		(2,033,000)
Other income (expense), net	(1,926,000)	(965,000)
Net loss	(7,643,000)	(11,987,000)
Net change in unrealized gain on available-for-sale securities, net of reclassification adjustments and taxes	4,000	6,000
Total comprehensive loss	$ (7,639,000)	$ (11,981,000)
Net loss per share
Net income per share, basic	$ (0.25)	$ (0.5)
Net income per share, diluted	$ (0.25)	$ (0.52)
Weighted-average shares used in computing net loss per share
Weighted-average shares used in computing net loss per share, basic	30,637	23,767
Weighted-average shares used in computing net loss per share, diluted	30,637	23,940
Collaborative Research and Development and Other Revenue [Member]
Total revenues	$ 496,000	$ 643,000
Product Revenue, Net [Member]
Total revenues	$ 1,331,000	$ 1,411,000

Condensed Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	2021 Sales Agreement [Member]	Common Stock [Member]	Common Stock [Member] 2021 Sales Agreement [Member]	Common Stock [Member] February 2023 Registered Direct Offering [Member]	Additional paid-in capital [Member]	Additional paid-in capital [Member] 2021 Sales Agreement [Member]	Accumulated other comprehensive loss [Member]	Accumulated deficit [Member]
Beginning balance at Dec. 31, 2022	$ 24,985		$ 23			$ 586,357		$ (13)	$ (561,382)
Beginning balance, shares at Dec. 31, 2022			22,785,000
Issuance of common stock in the February 2023 registered direct offering/pursuant to the 2021 Sales Agreement, shares					1,700,000
Stock-based compensation expense from stock options and ESPP shares	2,338					2,338
Net loss	(11,987)								(11,987)
Net change in unrealized loss on available-for-sale securities, net of reclassification adjustments and taxes	6							6
Ending balance at Mar. 31, 2023	15,342		$ 23			588,695		(7)	(573,369)
Ending balance, shares at Mar. 31, 2023			24,485,000
Beginning balance at Dec. 31, 2023	14,783		$ 23			603,780		(14)	(589,006)
Beginning balance, shares at Dec. 31, 2023			30,334,000
Issuance of common stock in the February 2023 registered direct offering/pursuant to the 2021 Sales Agreement		$ 647					$ 647
Issuance of common stock in the February 2023 registered direct offering/pursuant to the 2021 Sales Agreement, shares				702,000
Stock-based compensation expense from stock options and ESPP shares	509					509
Net loss	(7,643)								(7,643)
Net change in unrealized loss on available-for-sale securities, net of reclassification adjustments and taxes	4							4
Ending balance at Mar. 31, 2024	$ 8,300		$ 23			$ 604,936		$ (10)	$ (596,649)
Ending balance, shares at Mar. 31, 2024			31,036,000

Condensed Statements of Stockholders' Equity (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
2021 Sales Agreement [Member]
Stock issuance costs	$ 13

Condensed Statements of Cash Flows - USD ($)
$ in Thousands

3 Months Ended

Mar. 31, 2024

Mar. 31, 2023

Cash flows from operating activities

Net loss

$ (7,643)

$ (11,987)

Adjustments to reconcile net loss to net cash used in operating activities:

Depreciation and accretion

Stock-based compensation

509

602

Change in fair value of warrant liabilities

1,718

(2,477)

Loss on issuance of warrants

2,033

Other

100

Changes in assets and liabilities:

Accounts receivable

241

2,022

Inventories

(180)

(98)

Prepaid expenses and other assets

283

109

Accounts payable

(995)

(1,100)

Accrued liabilities

(846)

1,311

Deferred revenue

178

Total adjustments

877

2,724

Net cash used in operating activities

(6,766)

(9,263)

Cash flows from investing activities

Purchases of available-for-sale securities

(887)

(4,924)

Net cash used in investing activities

(887)

(4,924)

Cash flows from financing activities

Payments on term loan principal

(2,143)

Net proceeds from issuances of common stock pursuant to the 2021 Sales Agreement

648

Proceeds from issuances of warrants and common stock

10,000

Net cash (used in) provided by financing activities

(1,495)

10,000

Net decrease in cash, cash equivalents, and restricted cash

(9,148)

(4,187)

Cash, cash equivalents, and restricted cash, beginning of the period

^[1]

28,550

43,633

Cash, cash equivalents, and restricted cash, end of the period

^[1]

$ 19,402

$ 39,446

[1]	Includes restricted cash of $150,000 included in long term restricted investments on the condensed balance sheets at March 31, 2024, December 31, 2023 and March 31, 2023, respectively.

Condensed Statement of Cash Flows (Parenthetical) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Restricted Cash and Cash Equivalents, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Restricted Investments, Noncurrent	Restricted Investments, Noncurrent
Restricted cash	$ 150,000	$ 150,000

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net Income (Loss)	$ (7,643)	$ (11,987)

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2024
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Note 1. Summary of Significant Accounting Policies

Nature of Operations

Basis of Presentation

The results of operations for the interim periods presented are not necessarily indicative of results that may be expected for any other interim period or for the full fiscal year.

Liquidity and Need to Raise Additional Capital

Inventories

The Company’s inventories consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Raw materials	$	173	$	165
Work in process		1,060		1,164
Finished goods		1,165		890
Total inventories	$	2,398	$	2,219

Leases

Revenue Recognition

Product Revenue, Net

Collaborative Research and Development and Other Revenue

Total revenue by geographic region based on customers’ locations for the three months ended March 31, 2024 and 2023 are as follows (in thousands):


	Three months ended March 31,
	2024		2023
United States	$	973	$	1,278
Europe		543		431
Japan		147		170
Other		164		175
Total	$	1,827	$	2,054

Prepaid and Accrued Clinical Costs

Prepaid and Accrued Manufacturing Costs

Research and Development Expenses

Comprehensive Loss

Common Stock Warrants

Net Loss Per Share

The numerators and denominators in the calculation of basic and diluted net loss per share were as follows (in thousands except per share amounts):


	Three months ended March 31,
	2024			2023
Basic loss per share computation:
Net loss	$	(7,643	)	$	(11,987	)
Weighted average number of shares outstanding - basic		30,637			23,767
Net loss per share - basic	$	(0.25	)	$	(0.50	)

Diluted loss per share computation:
Net loss	$	(7,643	)	$	(11,987	)
Change in fair value of pre-funded warrant liabilities		—			384
Net loss adjusted for change in fair value of warrant liabilities	$	(7,643	)	$	(12,371	)

Weighted average shares used to compute basic net loss per share		30,637			23,767
Dilutive effect of pre-funded warrants		—			173
Weighted average shares used to compute diluted net loss per share		30,637			23,940
Net loss per share - diluted	$	(0.25	)	$	(0.52	)

Recent Accounting Pronouncements

Strategic Agreements

3 Months Ended

Mar. 31, 2024

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Strategic Agreements

Note 2. Strategic Agreements

Agreement with Innocoll

Patent Purchase Agreement with Indivior

Financial Instruments

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Financial Instruments

Note 3. Financial Instruments

•

Level 1—Quoted prices in active markets for identical assets or liabilities.

•

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The following is a summary of available-for-sale securities as of March 31, 2024 and December 31, 2023 (in thousands):


	March 31, 2024
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Money market funds	$	62	$	—	$	—		$	62
Certificates of deposit		150		—		—			150
Commercial paper		17,713		—		(10	)		17,703
	$	17,925	$	—	$	(10	)	$	17,915
Reported as:
Cash and cash equivalents	$	15,587	$	—	$	(9	)	$	15,578
Short-term investments		2,188		—		(1	)		2,187
Long-term restricted investments		150		—		—			150
	$	17,925	$	—	$	(10	)	$	17,915


	December 31, 2023
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Money market funds	$	951	$	—	$	—		$	951
Certificates of deposit		150		—		—			150
Commercial paper		24,896		—		(14	)		24,882
	$	25,997	$	—	$	(14	)	$	25,983
Reported as:
Cash and cash equivalents	$	24,566	$	—	$	(13	)	$	24,553
Short-term investments		1,281		—		(1	)		1,280
Long-term restricted investments		150		—		—			150
	$	25,997	$	—	$	(14	)	$	25,983

The following is a summary of the cost and estimated fair value of available-for-sale securities at March 31, 2024, by contractual maturity (in thousands):


	March 31, 2024
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	17,713	$	17,703
Mature after one year through five years		150		150
	$	17,863	$	17,853

There were no securities that have had an unrealized loss for more than 12 months as of March 31, 2024.

Warrant Liabilities

The following table summarizes the activity of the Company’s Level 3 warrant liabilities during the three months ended March 31, 2024 and 2023 (in thousands):


	Three months ended March 31,
	2024		2023
Fair value at beginning of period - February 2023 issuance (Pre-funded warrants)	$	—	$	—
Initial fair value at the original issuance date		—		1,743
Change in fair value during the period		—		(384	)
Fair value at end of period - February 2023 issuance (Pre-funded warrants)	$	—	$	1,359

Fair value at beginning of period - February 2023 issuance (Common warrants)	$	312	$	—
Initial fair value at the original issuance date		—		10,290
Change in fair value during the period		360		(2,093	)
Fair value at beginning of period - February 2023 issuance (Common warrants)	$	672	$	8,197

Fair value at beginning of period - July 2023 issuance (Common warrants)	$	912	$	—
Change in fair value during the period		1,358		—
Fair value at end of period - July 2023 issuance	$	2,270	$	—

Total fair value at end of period	$	2,942	$	9,556

February 2023 Warrants

Pre-Funded Warrants


	February 8, 2023 (issuance)
Common stock price	$	5.81
Exercise price per share	$	0.00001
Expected volatility		86.60	%
Risk-free interest rate		3.82	%
Contractual term (in years)		5.00
Expected dividend yield		—	%

Common Warrants


	February 8, 2023 (issuance)			March 31,2023			December 31, 2023			March 31,2024
Common stock price	$	5.81		$	4.53		$	0.59		$	1.21
Exercise price per share	$	5.00		$	5.00		$	0.51		$	0.51
Expected volatility		86.60	%		86.20	%		118.00	%		115.00	%
Risk-free interest rate		3.82	%		3.65	%		3.93	%		4.31	%
Contractual term (in years)		5.00			4.90			4.10			3.90
Expected dividend yield		—	%		—	%		—	%		—	%

July 2023 warrants

In July 2023, the Company issued common warrants to purchase an aggregate of 2,991,027 shares of common stock in a registered direct offering.



	July 21, 2023 (issuance)			December 31, 2023			March 31, 2024
Common stock price	$	3.05		$	0.59		$	1.21
Exercise price per share	$	4.89		$	4.89		$	4.89
Expected volatility		88.60	%		115.60	%		115.93	%
Risk-free interest rate		4.18	%		3.88	%		4.26	%
Contractual term (in years)		5.00			4.60			4.30
Expected dividend yield		—	%		—	%		—	%

There were no exercises of the common warrants issued in the July 2023 registered direct offering.

Accrued Liabilities

3 Months Ended

Mar. 31, 2024

Payables and Accruals [Abstract]

Accrued Liabilities

Note 4. Accrued Liabilities

Accrued liabilities as of March 31, 2024 and December 31, 2023 were comprised as follows (in thousands):


	March 31, 2024		December 31, 2023
Accrued compensation and benefits	$	1,534	$	1,320
Accrued contract research and manufacturing costs		2,704		2,340
Accrued clinical costs		78		1,578
Others		789		728
Total	$	5,105	$	5,966

Stock-Based Compensation

3 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

Note 5. Stock-Based Compensation


	Three months ended March 31,
	2024		2023
Cost of product revenues	$	4	$	4
Research and development		212		292
Selling, general and administrative		293		306
Total stock-based compensation	$	509	$	602

As of March 31, 2024 and December 31, 2023, $14,000 of stock-based compensation cost was capitalized in inventory on the Company’s balance sheets for each period, respectively.


	Three months ended March 31,
	2024		2023
Stock Options
Risk-free rate		—	4.05-4.07%
Expected dividend yield		—		—
Expected life of option (in years)		—	7.0-7.5
Volatility		—	87-88%


	Three months ended March 31,
	2024			2023
Employee Stock Purchase Plan
Risk-free rate		5.5	%		4.6	%
Expected dividend yield		—			—
Expected life of option (in years)	0.5			0.5
Volatility		92	%		104	%

Term Loan

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Term Loan

Note 6. Term Loan

The fair value of the term loan approximates the carrying value. Future maturities due under the term loan as of March 31, 2024, are as follows (in thousands):


Nine months ended December 31, 2024	$	6,429
2025		8,429
Total minimum payments		14,858
Less unamortized debt discount and accrued final payment		(246	)
Carrying value of term loan, net		14,612

Commitments

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Commitments

Note 7. Commitments

Operating Leases

The Company has lease arrangements for its facilities as follows.


Location	Approximate Square Feet	Operation	Expiration
Cupertino, CA	30,149 sq. ft.	Office, Laboratory and Manufacturing	Lease expires 2027 (with an option to renew for an additional five years)

Vacaville, CA	24,634 sq. ft.	Manufacturing	Lease expires 2028 (with an option to renew for an additional five years)

Future minimum payments under these noncancelable leases are as follows (in thousands):


	Operating Leases
Nine months ended December 31, 2024	$	1,032
2025		1,401
2026		1,443
2027		432
2028		227
	$	4,535

Stockholders' Equity

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Stockholders' Equity

Note 8. Stockholders’ Equity

Registered Direct Offerings

February 2023 Financing

As of March 31, 2024 and December 31, 2023, there were no pre-funded warrants outstanding.

July 2023 Financing

ATM Financings

Subsequent Events

3 Months Ended

Mar. 31, 2024

Subsequent Events [Abstract]

Subsequent Events

Note 9. Subsequent Events

None.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Nature of Operations

Basis of Presentation

The results of operations for the interim periods presented are not necessarily indicative of results that may be expected for any other interim period or for the full fiscal year.

Liquidity and Need to Raise Additional Capital

Inventories

The Company’s inventories consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Raw materials	$	173	$	165
Work in process		1,060		1,164
Finished goods		1,165		890
Total inventories	$	2,398	$	2,219

Leases

Revenue Recognition

Product Revenue, Net

Collaborative Research and Development and Other Revenue

Total revenue by geographic region based on customers’ locations for the three months ended March 31, 2024 and 2023 are as follows (in thousands):


	Three months ended March 31,
	2024		2023
United States	$	973	$	1,278
Europe		543		431
Japan		147		170
Other		164		175
Total	$	1,827	$	2,054

Prepaid and Accrued Clinical Costs

Prepaid and Accrued Manufacturing Costs

Research and Development Expenses

Comprehensive Loss

Common Stock Warrants

Net Loss Per Share

The numerators and denominators in the calculation of basic and diluted net loss per share were as follows (in thousands except per share amounts):


	Three months ended March 31,
	2024			2023
Basic loss per share computation:
Net loss	$	(7,643	)	$	(11,987	)
Weighted average number of shares outstanding - basic		30,637			23,767
Net loss per share - basic	$	(0.25	)	$	(0.50	)

Diluted loss per share computation:
Net loss	$	(7,643	)	$	(11,987	)
Change in fair value of pre-funded warrant liabilities		—			384
Net loss adjusted for change in fair value of warrant liabilities	$	(7,643	)	$	(12,371	)

Weighted average shares used to compute basic net loss per share		30,637			23,767
Dilutive effect of pre-funded warrants		—			173
Weighted average shares used to compute diluted net loss per share		30,637			23,940
Net loss per share - diluted	$	(0.25	)	$	(0.52	)

Recent Accounting Pronouncements

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2024

Accounting Policies [Abstract]

Summary of Components of Inventories

The Company’s inventories consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Raw materials	$	173	$	165
Work in process		1,060		1,164
Finished goods		1,165		890
Total inventories	$	2,398	$	2,219

Summary of Significant Accounting Policies - Summary of Total Revenue by Geographic Region Based on Customers' Locations

Total revenue by geographic region based on customers’ locations for the three months ended March 31, 2024 and 2023 are as follows (in thousands):


	Three months ended March 31,
	2024		2023
United States	$	973	$	1,278
Europe		543		431
Japan		147		170
Other		164		175
Total	$	1,827	$	2,054

Summary of Numerators and Denominators in Calculation of Basic and Diluted Net (Loss) Income per Share

The numerators and denominators in the calculation of basic and diluted net loss per share were as follows (in thousands except per share amounts):


	Three months ended March 31,
	2024			2023
Basic loss per share computation:
Net loss	$	(7,643	)	$	(11,987	)
Weighted average number of shares outstanding - basic		30,637			23,767
Net loss per share - basic	$	(0.25	)	$	(0.50	)

Diluted loss per share computation:
Net loss	$	(7,643	)	$	(11,987	)
Change in fair value of pre-funded warrant liabilities		—			384
Net loss adjusted for change in fair value of warrant liabilities	$	(7,643	)	$	(12,371	)

Weighted average shares used to compute basic net loss per share		30,637			23,767
Dilutive effect of pre-funded warrants		—			173
Weighted average shares used to compute diluted net loss per share		30,637			23,940
Net loss per share - diluted	$	(0.25	)	$	(0.52	)

Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Summary of Money Market Funds and Available-for-Sale Securities

The following is a summary of available-for-sale securities as of March 31, 2024 and December 31, 2023 (in thousands):


	March 31, 2024
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Money market funds	$	62	$	—	$	—		$	62
Certificates of deposit		150		—		—			150
Commercial paper		17,713		—		(10	)		17,703
	$	17,925	$	—	$	(10	)	$	17,915
Reported as:
Cash and cash equivalents	$	15,587	$	—	$	(9	)	$	15,578
Short-term investments		2,188		—		(1	)		2,187
Long-term restricted investments		150		—		—			150
	$	17,925	$	—	$	(10	)	$	17,915


	December 31, 2023
	Amortized Cost		Unrealized Gain		Unrealized Loss			Estimated Fair Value
Money market funds	$	951	$	—	$	—		$	951
Certificates of deposit		150		—		—			150
Commercial paper		24,896		—		(14	)		24,882
	$	25,997	$	—	$	(14	)	$	25,983
Reported as:
Cash and cash equivalents	$	24,566	$	—	$	(13	)	$	24,553
Short-term investments		1,281		—		(1	)		1,280
Long-term restricted investments		150		—		—			150
	$	25,997	$	—	$	(14	)	$	25,983

Summary of Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturity

The following is a summary of the cost and estimated fair value of available-for-sale securities at March 31, 2024, by contractual maturity (in thousands):


	March 31, 2024
	Amortized Cost		Estimated Fair Value
Mature in one year or less	$	17,713	$	17,703
Mature after one year through five years		150		150
	$	17,863	$	17,853

Summary of Activity of the Company's Level 3 Warrant Liabilities

The following table summarizes the activity of the Company’s Level 3 warrant liabilities during the three months ended March 31, 2024 and 2023 (in thousands):


	Three months ended March 31,
	2024		2023
Fair value at beginning of period - February 2023 issuance (Pre-funded warrants)	$	—	$	—
Initial fair value at the original issuance date		—		1,743
Change in fair value during the period		—		(384	)
Fair value at end of period - February 2023 issuance (Pre-funded warrants)	$	—	$	1,359

Fair value at beginning of period - February 2023 issuance (Common warrants)	$	312	$	—
Initial fair value at the original issuance date		—		10,290
Change in fair value during the period		360		(2,093	)
Fair value at beginning of period - February 2023 issuance (Common warrants)	$	672	$	8,197

Fair value at beginning of period - July 2023 issuance (Common warrants)	$	912	$	—
Change in fair value during the period		1,358		—
Fair value at end of period - July 2023 issuance	$	2,270	$	—

Total fair value at end of period	$	2,942	$	9,556

Calculation of Estimated Fair Value of Warrants Using Models with Key Assumptions

The Company calculated the estimated fair value of the pre-funded warrants using a Black-Scholes option pricing model with the following key assumptions:


	February 8, 2023 (issuance)
Common stock price	$	5.81
Exercise price per share	$	0.00001
Expected volatility		86.60	%
Risk-free interest rate		3.82	%
Contractual term (in years)		5.00
Expected dividend yield		—	%


	February 8, 2023 (issuance)			March 31,2023			December 31, 2023			March 31,2024
Common stock price	$	5.81		$	4.53		$	0.59		$	1.21
Exercise price per share	$	5.00		$	5.00		$	0.51		$	0.51
Expected volatility		86.60	%		86.20	%		118.00	%		115.00	%
Risk-free interest rate		3.82	%		3.65	%		3.93	%		4.31	%
Contractual term (in years)		5.00			4.90			4.10			3.90
Expected dividend yield		—	%		—	%		—	%		—	%



	July 21, 2023 (issuance)			December 31, 2023			March 31, 2024
Common stock price	$	3.05		$	0.59		$	1.21
Exercise price per share	$	4.89		$	4.89		$	4.89
Expected volatility		88.60	%		115.60	%		115.93	%
Risk-free interest rate		4.18	%		3.88	%		4.26	%
Contractual term (in years)		5.00			4.60			4.30
Expected dividend yield		—	%		—	%		—	%

Accrued Liabilities (Tables)

3 Months Ended

Mar. 31, 2024

Payables and Accruals [Abstract]

Schedule of accrued liabilities

Accrued liabilities as of March 31, 2024 and December 31, 2023 were comprised as follows (in thousands):


	March 31, 2024		December 31, 2023
Accrued compensation and benefits	$	1,534	$	1,320
Accrued contract research and manufacturing costs		2,704		2,340
Accrued clinical costs		78		1,578
Others		789		728
Total	$	5,105	$	5,966

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Summary of Stock-Based Compensation Cost that has been Included in Statements of Operations and Comprehensive Loss

The stock-based compensation cost that has been included in the statements of operations and comprehensive loss is shown as below (in thousands):


	Three months ended March 31,
	2024		2023
Cost of product revenues	$	4	$	4
Research and development		212		292
Selling, general and administrative		293		306
Total stock-based compensation	$	509	$	602

Summary of Assumptions Used to Estimate Fair Value of Options Granted and Shares Purchased


	Three months ended March 31,
	2024		2023
Stock Options
Risk-free rate		—	4.05-4.07%
Expected dividend yield		—		—
Expected life of option (in years)		—	7.0-7.5
Volatility		—	87-88%


	Three months ended March 31,
	2024			2023
Employee Stock Purchase Plan
Risk-free rate		5.5	%		4.6	%
Expected dividend yield		—			—
Expected life of option (in years)	0.5			0.5
Volatility		92	%		104	%

Term Loan (Tables)

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Schedule of Future Maturities due under Term Loan

The fair value of the term loan approximates the carrying value. Future maturities due under the term loan as of March 31, 2024, are as follows (in thousands):


Nine months ended December 31, 2024	$	6,429
2025		8,429
Total minimum payments		14,858
Less unamortized debt discount and accrued final payment		(246	)
Carrying value of term loan, net		14,612

Commitments (Tables)

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies Disclosure [Abstract]

Summary of Lease Arrangements of Company Facilities

The Company has lease arrangements for its facilities as follows.


Location	Approximate Square Feet	Operation	Expiration
Cupertino, CA	30,149 sq. ft.	Office, Laboratory and Manufacturing	Lease expires 2027 (with an option to renew for an additional five years)

Vacaville, CA	24,634 sq. ft.	Manufacturing	Lease expires 2028 (with an option to renew for an additional five years)

Schedule of Future Operating Lease Minimum Payments

Future minimum payments under these noncancelable leases are as follows (in thousands):


	Operating Leases
Nine months ended December 31, 2024	$	1,032
2025		1,401
2026		1,443
2027		432
2028		227
	$	4,535

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Nov. 30, 2023	Feb. 03, 2023
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit	$ 596,649		$ 589,006
Options to purchase common stock excluded from computation of diluted net loss per share	4,000,000	3,000,000
Number of warrants to purchase common stock	600,000
Dilutive effect of pre-funded warrants		173,000
Weighted-average remaining lease term	3 years 3 months 29 days
Pre-Funded Warrants [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of warrants to purchase common stock				300,000	300,000
Warrant [Member]
Summary Of Significant Accounting Policies [Line Items]
Options to purchase common stock excluded from computation of diluted net loss per share	261,000	1,200,000
Number of warrants to purchase common stock					2,000,000

Summary of Significant Accounting Policies - Summary of Components of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Accounting Policies [Abstract]
Raw materials	$ 173	$ 165
Work in process	1,060	1,164
Finished goods	1,165	890
Total inventories	$ 2,398	$ 2,219

Summary of Significant Accounting Policies - Summary of Total Revenue by Geographic Region Based on Customers' Locations (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,827	$ 2,054
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	973	1,278
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	543	431
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	147	170
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 164	$ 175

Summary of Significant Accounting Policies - Summary of Numerators and Denominators in Calculation of Basic and Diluted Net (Loss) Income per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Basic loss per share computation:
Net Income (Loss)	$ (7,643)	$ (11,987)
Weighted average number of shares outstanding - basic	30,637	23,767
Net loss per share - basic	$ (0.25)	$ (0.5)
Diluted loss per share computation:
Net Income (Loss)	$ (7,643)	$ (11,987)
Change in fair value of pre-funded warrant liabilities		384
Net loss adjusted for change in fair value of warrant liabilities	$ (7,643)	$ (12,371)
Weighted-average shares used in computing net loss per share, basic	30,637	23,767
Dilutive effect of pre-funded warrants		173
Weighted average shares used to compute diluted net loss per share	30,637	23,940
Net loss per share - diluted	$ (0.25)	$ (0.52)

Strategic Agreements - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended
	Sep. 30, 2017	Mar. 31, 2024	Mar. 31, 2023
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total revenues		$ 1,827,000	$ 2,054,000
Non Refundable Upfront Payment Received	$ 17,500,000
Agreement With Innocoll
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Additional Milestone Payment		122,000,000
Revenues recognized		0	0
Collaborative Research and Development and Other Revenue [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Total revenues		$ 496,000	$ 643,000

Financial Instruments - Summary of Money Market Funds and Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 17,925	$ 25,997
Unrealized Loss	(10)	(14)
Estimated Fair Value	17,915	25,983
Money market funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	62	951
Estimated Fair Value	62	951
Certificates of deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	150	150
Estimated Fair Value	150	150
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	17,713	24,896
Unrealized Loss	(10)	(14)
Estimated Fair Value	17,703	24,882
Cash and cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	15,587	24,566
Unrealized Loss	(9)	(13)
Estimated Fair Value	15,578	24,553
Short-term investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,188	1,281
Unrealized Loss	(1)	(1)
Estimated Fair Value	2,187	1,280
Long Term Restricted Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	150	150
Estimated Fair Value	$ 150	$ 150

Financial Instruments - Summary of Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturity (Detail) $ in Thousands	Mar. 31, 2024 USD ($)
Investments, Debt and Equity Securities [Abstract]
Mature in one year or less, Amortized Cost	$ 17,713
Mature after one year through five years, Amortized Cost	150
Amortized Cost	17,863
Mature in one year or less, Estimated Fair Value	17,703
Mature after one year through five years, Estimated Fair Value	150
Estimated Fair Value	$ 17,853

Financial Instruments - Additional Information (Detail) - USD ($)	1 Months Ended		6 Months Ended	12 Months Ended
	Nov. 30, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2023	Mar. 31, 2024	Jul. 31, 2023	Jul. 21, 2023	Feb. 08, 2023	Feb. 03, 2023
Marketable Securities [Line Items]
Unrealized loss of securities					$ 0
Number of warrants to purchase common stock					600,000
Pre-funded warrants liabilities				$ 0	$ 0			$ 1,700,000
Common warrants liabilities				$ 1,224,000	$ 2,942,000
Common warrants exercised		1,400,000
Issuance of common stock upon warrant exercises	300,000	924,000
Warrants exercise price					$ 0.66
Exercise price per share			$ 5	$ 0.51
Exercise price of outstanding common warrants, shares				600,000
Monte-Carlo [Member]
Marketable Securities [Line Items]
Common warrants liabilities				$ 312,000	$ 672,000			$ 10,300,000
Black-Scholes [Member]
Marketable Securities [Line Items]
Re-valued common warrants				$ 912,000	$ 2,300,000		$ 5,800,000
Warrant [Member]
Marketable Securities [Line Items]
Number of warrants to purchase common stock									2,000,000
Pre-Funded Warrants [Member]
Marketable Securities [Line Items]
Number of warrants to purchase common stock	300,000								300,000
Common Warrants [Member]
Marketable Securities [Line Items]
Number of warrants to purchase common stock						2,991,027

Financial Instruments - Summary of Activity of the Company's Level 3 Warrant Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total Fair value at end of period	$ 2,942		$ 1,224
Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Change in fair value of warrant liabilities	Change in fair value of warrant liabilities
Level 3 \| February 2023 Pre-funded Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Initial fair value at the original issuance date		$ 1,743
Change in fair value during the period		(384)
Fair value at end of period		1,359
Level 3 \| February 2023 Common Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value at beginning of period	$ 312
Initial fair value at the original issuance date		10,290
Change in fair value during the period	360	(2,093)
Fair value at end of period	672	8,197
Level 3 \| July 2023 Common Warrants
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value at beginning of period	912
Change in fair value during the period	1,358
Fair value at end of period	2,270
Total Fair value at end of period	$ 2,942	$ 9,556

Financial Instruments - Calculation of Estimated Fair Value of Warrants Using Models with Key Assumptions (Details) - $ / shares			3 Months Ended		6 Months Ended	12 Months Ended
	Jul. 21, 2023	Feb. 08, 2023	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2023	Dec. 31, 2023
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Exercise price per share					$ 5	$ 0.51
Pre-Funded Warrants [Member] \| Black-Scholes [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Common stock price		$ 5.81
Pre-Funded Warrants [Member] \| Black-Scholes [Member] \| Exercise Price [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Exercise price per share		$ 0.00001
Pre-Funded Warrants [Member] \| Black-Scholes [Member] \| Expected Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Expected volatility		86.60%
Pre-Funded Warrants [Member] \| Black-Scholes [Member] \| Risk Free Interest Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Risk-free interest rate		3.82%
Pre-Funded Warrants [Member] \| Black-Scholes [Member] \| Contractual Term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contractual term (in years)		5 years
Warrant [Member] \| Monte-Carlo [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Common stock price		$ 5.81	$ 1.21	$ 4.53		0.59
Warrant [Member] \| Monte-Carlo [Member] \| Exercise Price [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Exercise price per share		$ 5	$ 0.51	$ 5		$ 0.51
Warrant [Member] \| Monte-Carlo [Member] \| Expected Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Expected volatility		86.60%	115.00%	86.20%		118.00%
Warrant [Member] \| Monte-Carlo [Member] \| Risk Free Interest Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Risk-free interest rate		3.82%	4.31%	3.65%		3.93%
Warrant [Member] \| Monte-Carlo [Member] \| Contractual Term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contractual term (in years)		5 years	3 years 10 months 24 days	4 years 10 months 24 days		4 years 1 month 6 days
Common Warrants [Member] \| Black-Scholes [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Common stock price	$ 3.05		$ 1.21			$ 0.59
Common Warrants [Member] \| Black-Scholes [Member] \| Exercise Price [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Exercise price per share	$ 4.89		$ 4.89			$ 4.89
Common Warrants [Member] \| Black-Scholes [Member] \| Expected Volatility [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Expected volatility	88.60%		115.93%			115.60%
Common Warrants [Member] \| Black-Scholes [Member] \| Risk Free Interest Rate [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Risk-free interest rate	4.18%		4.26%			3.88%
Common Warrants [Member] \| Black-Scholes [Member] \| Contractual Term [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contractual term (in years)	5 years		4 years 3 months 18 days			4 years 7 months 6 days

Accrued Liabilities (Details) - Schedule of accrued liabilities - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Accrued Liabilities [Abstract]
Accrued compensation and benefits	$ 1,534	$ 1,320
Accrued contract research and manufacturing costs	2,704	2,340
Accrued clinical costs	78	1,578
Others	789	728
Total	$ 5,105	$ 5,966

Stock-Based Compensation - Summary of Stock-Based Compensation Cost that has been Included in Statements of Operations and Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 509	$ 602
Cost of product revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	4	4
Research and development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	212	292
Selling, general and administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 293	$ 306

Stock-Based Compensation - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based compensation cost capitalized in inventory	$ 14,000	$ 14,000
Stock options granted	0

Stock-Based Compensation - Summary of Assumptions Used to Estimate Fair Value of Options Granted and Shares Purchased (Detail)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Employees Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free rate	5.50%	4.60%
Expected life of option (in years)	6 months	6 months
Volatility	92.00%	104.00%
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free rate, minimum		4.05%
Risk-free rate, maximum		4.07%
Volatility, minimum		87.00%
Volatility, maximum		88.00%
Stock Option Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of option (in years)		7 years
Stock Option Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life of option (in years)		7 years 6 months

Term Loan - Additional Information (Detail) - Oxford Finance LLC Term Loan [Member] - USD ($)	1 Months Ended					3 Months Ended
	May 31, 2021	Dec. 31, 2019	Nov. 30, 2018	Feb. 28, 2018	Jul. 31, 2016	Mar. 31, 2024	Mar. 31, 2023
Debt Instrument [Line Items]
Secured term loan					$ 20,000,000
Term loan repayment description					As amended, the Loan Agreement provides for interest only payments through June 1, 2023, followed by consecutive monthly payments of principal and interest in arrears starting on June 1, 2023 and continuing through the maturity date of the term loan of September 1, 2025.
First principal payment date					Jun. 01, 2023
Term loan, maturity date					Sep. 01, 2025
Interest rate on term loan					7.95%	12.73%
Term loan, floating interest rate basis					an index rate plus a spread
Facility fee paid at final payment					$ 150,000
Percentage of an additional payment equal to principal amount					10.00%
Debt offering/issuance costs					$ 2,000,000
Principal payments						$ 2,100,000	$ 5,000,000
Loan modification fee	$ 712,500	$ 825,000	$ 900,000	$ 100,000
Minimum [Member]
Debt Instrument [Line Items]
Percentage of prepayment fee					0.75%
Maximum [Member]
Debt Instrument [Line Items]
Percentage of prepayment fee					2.50%

Term Loan - Schedule of Future Maturities due under Term Loan (Detail) $ in Thousands	Mar. 31, 2024 USD ($)
Future maturities and interest payments under the term loan:
Nine months ended December 31, 2024	$ 6,429
2025	8,429
Total minimum payments	14,858
Less unamortized debt discount and accrued final payment	(246)
Carrying value of term loan, net	$ 14,612

Commitments - Summary of Lease Arrangements of Company Facilities (Detail)	3 Months Ended
	Mar. 31, 2024 ft²
Vacaville, CA [Member] \| Manufacturing [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Approximate Square Feet	24,634
Lease Expiration Term	Lease expires 2028 (with an option to renew for an additional five years)
Lease expiration year	2028
Lease renewal term	5 years
Cupertino, CA [Member] \| Office, Laboratory and Manufacturing [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Lease expiration year	2027
Lease renewal term	5 years
Cupertino, CA [Member] \| Office, Laboratory and Manufacturing [Member] \| Lease Amendment [Member]
Property Subject To Or Available For Operating Lease [Line Items]
Approximate Square Feet	30,149
Lease Expiration Term	Lease expires 2027 (with an option to renew for an additional five years)

Commitments - Additional Information (Detail) - USD ($)	3 Months Ended
Commitments - Additional Information (Detail) - USD ($)	Mar. 31, 2024	Mar. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Rent expenses of operating leases	$ 460,000	$ 479,000

Commitments - Schedule of Future Operating Lease Minimum Payments (Detail) $ in Thousands	Mar. 31, 2024 USD ($)
Leases [Abstract]
Nine months ended December 31, 2024	$ 1,032
2025	1,401
2026	1,443
2027	432
2028	227
Total operating leases future minimum payments	$ 4,535

Stockholders' Equity - Additional Information (Detail)	Jul. 31, 2021 USD ($)
Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Securities offered	$ 250,000,000
2021 Sales Agreement [Member] \| Cantor Fitzgerald Co [Member] \| Minimum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Securities offered	$ 75,000,000

Stockholders' Equity - Registered Direct Offerings - Additional Information (Detail) - USD ($)					1 Months Ended		3 Months Ended		12 Months Ended
	Jul. 21, 2023	Jul. 19, 2023	Feb. 08, 2023	Feb. 03, 2023	Nov. 30, 2023	Sep. 30, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	May 09, 2024	Jul. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants to purchase common stock							600,000
Issuance cost for warrants								$ (1,200,000)
Warrants exercise price							$ 0.66
Common warrants liabilities							$ 2,942,000		$ 1,224,000
Pre-funded warrants liabilities			$ 1,700,000				0		0
Common warrants exercised						1,400,000
Loss (gain) on change in fair value of warrant liability							1,718,000	$ (2,477,000)
Proceeds from sale of common stock, net of commissions							648,000
Monte-Carlo [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common warrants liabilities			$ 10,300,000				672,000		312,000
Black-Scholes [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Re-valued common warrants	$ 5,800,000						$ 2,300,000		$ 912,000
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants to purchase common stock				2,000,000
Warrant [Member] \| Monte-Carlo [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock price			$ 5.81				$ 1.21	$ 4.53	$ 0.59
Pre-Funded Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of warrants to purchase common stock				300,000	300,000
Pre-Funded Warrants [Member] \| Black-Scholes [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock price			$ 5.81
February 2023 Financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Description of Transaction							On February 3, 2023, the Company entered into a securities purchase agreement with two institutional investors
Date of agreement							Feb. 03, 2023
Number of warrants to purchase common stock						924,000	600,000		600,000
Gross proceeds from purchase agreement				$ 1,200,000
Gross proceeds from sale of common stock				$ 8,800,000
Warrants exercise price							$ 0.51		$ 0.51
Class of Warrant Reduced as a Result of Anti Dilutive provision of Common Stock				$ 4.89
Class of warrant reduced as a result of sale of common stock in the open market				$ 0.51
Loss on issuance of warrants			$ 10,000,000
Common warrants exercised						1,400,000
Gain on exercise of warrant									$ 3,400,000
Loss on issuance of common warrants			2,000,000
Issuance of shares									2,800,000
February 2023 Financing [Member] \| Monte-Carlo [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common warrants liabilities			10,300,000
Pre-funded warrants liabilities							$ 672,000
Increase in common warrants									$ 360,000
February 2023 Financing [Member] \| Black-Scholes [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-funded warrants liabilities			$ 1,700,000
February 2023 Financing [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock number of shares issued in transaction				1,700,000
Common stock price				$ 0.0001
Number of warrants to purchase common stock				300,000
February 2023 Financing [Member] \| Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock price				$ 5
Number of warrants to purchase common stock				2,000,000
Warrants exercise price				$ 5
Warrants exercisable term				5 years
February 2023 Financing [Member] \| Pre-Funded Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock price				$ 4.99999
Number of warrants to purchase common stock					300,000		0		0
Warrants exercise price				$ 0.00001
Common warrants exercised					300,000
Gain on exercise of warrant					$ 561,000
Issuance of shares					$ 186,000
Loss (gain) on change in fair value of warrant liability							$ 360,000	$ 2,500,000
February 2023 Financing [Member] \| Pre Funded Warrant And Common Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of ownership on outstanding common stock immediately after exercise				4.99%
Percentage of ownership on outstanding common stock at election of holder				9.99%
July 2023 Financing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Description of Transaction							On July 19, 2023, the Company entered into a securities purchase agreement with several institutional investors
Date of agreement		Jul. 21, 2023					Jul. 19, 2023
Common stock price	$ 3.05
Gross proceeds from purchase agreement		$ 13,900,000
Gross proceeds from sale of common stock		$ 1,100,000
Warrants exercise price							$ 4.89		$ 4.89
Common warrants liabilities	$ 9,100,000
Issuance of shares									$ 673,000
Fair value of common stock and common warrant issued	$ 1,100,000
Amount Allocated to Common Warrant									$ 427,000
Loss (gain) on change in fair value of warrant liability							$ (1,400,000)
Sale of common stock during period	2,991,027
Class of warrant or right issued							0		0
July 2023 Financing [Member] \| Monte-Carlo [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-funded warrants liabilities							$ 2,300,000
Increase in common warrants									$ 1,400,000
July 2023 Financing [Member] \| Black-Scholes [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common warrants liabilities									$ 912,000		$ 5,800,000
July 2023 Financing [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of stock number of shares issued in transaction		2,991,027
Common stock price		$ 0.0001
July 2023 Financing [Member] \| Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock price		$ 5.015
Number of warrants to purchase common stock		2,991,027					2,991,027		2,991,027
Warrants exercise price		$ 4.89
Warrants exercisable term		5 years
July 2023 Financing [Member] \| Pre Funded Warrant And Common Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of ownership on outstanding common stock immediately after exercise		4.99%
Percentage of ownership on outstanding common stock at election of holder		9.99%
2021 Registration Statement [Member] \| Maximum [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available-for-sale Securities										$ 222,700,000
2021 Sales Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of shares							$ 13,000
2021 Sales Agreement [Member] \| IPO [Member] \| Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Available-for-sale Securities										$ 72,700,000
2021 Sales Agreement [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Sale of common stock during period							702,000
2021 Registration Statement and 2021 Sales Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from sale of common stock, net of commissions							$ 648,000
Sale of common stock during period							702,090
Common stock weighted average price							$ 0.94

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