Talphera (TLPH) 10-Q 13 Nov 24 2024 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2024	Nov. 07, 2024
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Document Transition Report	false
Entity File Number	001-35068
Entity Registrant Name	TALPHERA, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	41-2193603
Entity Address, Address Line One	1850 Gateway Drive, Suite 175
Entity Address, City or Town	San Mateo
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94404
City Area Code	650
Local Phone Number	216-3500
Title of 12(b) Security	Common Stock, $0.001 par value
Trading Symbol	TLPH
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding (in shares)		17,029,218
Entity Central Index Key	0001427925
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	[1]
Current Assets:
Cash and cash equivalents	$ 11,117	$ 5,721
Short-term investments	0	3,660
Prepaid expenses and other current assets	1,078	2,195
Total current assets	12,195	11,576
In-process research and development asset	8,819	8,819
Total assets	21,014	20,395
Current Liabilities:
Accounts payable	396	1,336
Accrued and other liabilities	1,643	2,445
Liabilities of discontinued operations, current portion	723	731
Total current liabilities	2,762	4,512
Warrant liability	2,084	1,778
Liability related to the sale of future payments	6,527	0
Total liabilities	11,373	6,290
Commitments and Contingencies
Common stock, $0.001 par value—200,000,000 shares authorized as of September 30, 2024 and December 31, 2023; 17,026,313 and 16,952,519 shares issued and outstanding as of September 30, 2024 and December 31, 2023, respectively	17	17
Additional paid-in capital	464,984	458,314
Accumulated deficit	(455,360)	(444,226)
Total stockholders’ equity	9,641	14,105
Total Liabilities and Stockholders’ Equity	$ 21,014	$ 20,395
[1]The condensed consolidated balance sheet as of December 31, 2023 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - $ / shares	Sep. 30, 2024	Dec. 31, 2023
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.001	$ 0.001
Common Stock, Shares Authorized (in shares)	200,000,000	200,000,000
Common Stock, Shares, Issued (in shares)	17,026,313	16,952,519
Common Stock, Shares, Outstanding (in shares)	17,026,313	16,952,519

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenue	$ 0	$ 117	$ 0	$ 370
Operating Costs and Expenses [Abstract]
Research and development	2,053	1,178	5,395	3,777
Selling, general and administrative	1,696	2,248	6,861	9,199
Total operating costs and expenses	3,749	3,426	12,256	12,976
Other income, net:
Interest expense	0	0	0	(134)
Interest income and other income, net	155	187	576	1,245
Gain on sale of future payments	0	0	1,246	0
Gain (loss) on change in fair value of warrant liability	241	1,706	(306)	5,718
Non-cash interest expense on liability related to the sale of future payments	0	0	(394)	0
Total other income, net	396	1,893	1,122	6,829
Net loss before income taxes	(3,353)	(1,416)	(11,134)	(5,777)
Provision for income taxes	0	(2)	0	(5)
Net loss from continuing operations	(3,353)	(1,418)	(11,134)	(5,782)
Net income (loss) from discontinued operations – See Note 3	0	61	0	(8,098)
Net loss	$ (3,353)	$ (1,357)	$ (11,134)	$ (13,880)
Basic and diluted, continuing operations (in dollars per share)	$ (0.13)	$ (0.08)	$ (0.43)	$ (0.45)
Basic and diluted, discontinued operations (in dollars per share)	0	0	0	(0.63)
Basic and diluted loss per share (in dollars per share)	$ (0.13)	$ (0.08)	$ (0.43)	$ (1.08)
Shares used in computing net loss per share of common stock, basic and diluted – See Note 10 (in shares)	26,212,902	16,758,322	25,713,999	12,880,338
Product [Member]
Operating Costs and Expenses [Abstract]
Loss from operations	$ (3,749)	$ (3,309)	$ (12,256)	$ (12,606)

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2022	8,243,680
Balance at Dec. 31, 2022	$ 8	$ 447,635	$ (425,829)	$ 21,814
Stock-based compensation	$ 0		0	569
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes (in shares)	21,700
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes	$ 0	(22)	0	(22)
Issuance of common stock upon ESPP purchase (in shares)	26,016
Issuance of common stock upon ESPP purchase	$ 1	30	0	31
Net loss	$ 0		(8,152)	(8,152)
Balance (in shares) at Mar. 31, 2023	10,924,294
Balance at Mar. 31, 2023	$ 11	448,212	(433,981)	14,242
Exercise of prefunded warrants (in shares)	2,632,898
Exercise of prefunded warrants	$ 2	0	0	2
Balance (in shares) at Dec. 31, 2022	8,243,680
Balance at Dec. 31, 2022	$ 8	447,635	(425,829)	21,814
Net loss				(13,880)
Balance (in shares) at Sep. 30, 2023	16,952,269
Balance at Sep. 30, 2023	$ 17	457,999	(439,709)	18,307
Balance (in shares) at Mar. 31, 2023	10,924,294
Balance at Mar. 31, 2023	$ 11	448,212	(433,981)	14,242
Stock-based compensation		471		471
Net loss			(4,371)	(4,371)
Balance (in shares) at Jun. 30, 2023	10,994,102
Balance at Jun. 30, 2023	$ 11	448,760	(438,352)	10,419
Issuance of hold back common stock in connection with asset acquisition (in shares)	69,808
Issuance of hold back common stock in connection with asset acquisition		77		77
Stock-based compensation	$ 0	378	0	378
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes (in shares)	5,500
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes	$ 0	0	0	0
Issuance of common stock upon ESPP purchase (in shares)	16,193
Issuance of common stock upon ESPP purchase	$ 0	14	0	14
Net loss	$ 0	0	(1,357)	(1,357)
Balance (in shares) at Sep. 30, 2023	16,952,269
Balance at Sep. 30, 2023	$ 17	457,999	(439,709)	18,307
Exercise of prefunded warrants (in shares)	595,883
Exercise of prefunded warrants	$ 1	0	0	1
Issuance of common stock and warrants, net (in shares)	5,340,591
Issuance of common stock and warrants, net	$ 5	8,847	0	8,852
Balance (in shares) at Dec. 31, 2023	16,952,519
Balance at Dec. 31, 2023	$ 17	458,314	(444,226)	14,105	[1]
Stock-based compensation	$ 0	302	0	302
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes (in shares)	23,952
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes	$ 0	(17)		(17)
Net proceeds from issuance of pre-funded warrants in connection with equity financing		5,884	0	5,884
Issuance of common stock upon ESPP purchase (in shares)	16,255
Issuance of common stock upon ESPP purchase	$ 0	14	0	14
Net loss	$ 0	0	(3,954)	(3,954)
Balance (in shares) at Mar. 31, 2024	16,992,726
Balance at Mar. 31, 2024	$ 17	464,497	(448,180)	16,334
Balance (in shares) at Dec. 31, 2023	16,952,519
Balance at Dec. 31, 2023	$ 17	458,314	(444,226)	14,105	[1]
Net loss				(11,134)
Balance (in shares) at Sep. 30, 2024	17,026,313
Balance at Sep. 30, 2024	$ 17	464,984	(455,360)	9,641
Balance (in shares) at Mar. 31, 2024	16,992,726
Balance at Mar. 31, 2024	$ 17	464,497	(448,180)	16,334
Stock-based compensation		223		223
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes (in shares)	251
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes				0
Net loss			(3,827)	(3,827)
Balance (in shares) at Jun. 30, 2024	16,992,977
Balance at Jun. 30, 2024	$ 17	464,720	(452,007)	12,730
Stock-based compensation	$ 0	234	0	234
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes (in shares)	76
Issuance of common stock upon vesting of restricted stock units, net of shares withheld for employee taxes				0
Issuance of common stock upon ESPP purchase (in shares)	33,260
Issuance of common stock upon ESPP purchase	$ 0	30	0	30
Net loss	$ 0	0	(3,353)	(3,353)
Balance (in shares) at Sep. 30, 2024	17,026,313
Balance at Sep. 30, 2024	$ 17	$ 464,984	$ (455,360)	$ 9,641
[1]The condensed consolidated balance sheet as of December 31, 2023 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Cash flows from operating activities:
Net loss	$ (11,134)	$ (13,880)
Adjustments to reconcile net loss to net cash used in operating activities:
Non-cash interest expense on liability related to sale of future payments	394	0
Depreciation and amortization	0	311
Net amortization of discount on short term investments	(121)	(15)
Non-cash interest expense related to debt financing	0	53
Revaluation of liability for Lowell holdback shares	0	(723)
Stock-based compensation	759	1,418
Loss (gain) on change in fair value of warrant liability	306	(5,718)
Impairment of net assets held for sale	0	6,853
Impairment of fixed assets	0	1,065
Gain on termination of lease liabilities	0	(1,098)
Gain on extinguishment of debt liability	0	(400)
Changes in operating assets and liabilities:
Inventories	0	61
Prepaid expenses and other current assets	1,117	1,423
Accounts payable	(945)	(957)
Accrued liabilities	(805)	(1,761)
Operating lease liabilities	0	(146)
Deferred revenue	0	(29)
Net cash used in operating activities	(10,429)	(13,543)
Cash flows from investing activities:
Purchase of property and equipment	0	(100)
Sale of the DSUVIA assets	0	2,723
Purchase of investments	(4,979)	0
Proceeds from maturities of investments	8,760	500
Net cash provided by investing activities	3,781	3,123
Cash flows from financing activities:
Payment of long-term debt	0	(5,416)
Gross proceeds from sale of future payments	6,654	0
Issuance costs related to sale of future payments	(521)	0
Net proceeds from issuance of common stock in connection with exercise of prefunded warrants	5,884	3
Net proceeds from issuance of common stock through equity plans	27	23
Net cash provided by financing activities	12,044	3,534
Net change in cash and cash equivalents	5,396	(6,886)
Cash and cash equivalents—Beginning of period	5,721	20,275
Cash and cash equivalents—End of period	11,117	13,389
NONCASH INVESTING AND FINANCING ACTIVITIES:
Equity issuance costs from warrant modification	251	0
Settlement for held back shares issued in connection with asset acquisition	0	(77)
Offering costs in accounts payable	0	72
Fair value of warrants issued to placement agent	0	263
July 2023 Private Placement Offering [Member]
Cash flows from financing activities:
Net proceeds from issuance of common stock, accompanying warrants and pre-funded warrants in July 2023 private placement offering	$ 0	$ 8,924

Note 1 - Organization and Summa

Note 1 - Organization and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Basis of Presentation and Significant Accounting Policies [Text Block]	1. Organization and Summary of Significant Accounting Policies The Company Talphera, Inc., or the Company, or Talphera, was incorporated in Delaware on July 13, 2005 as SuRx, Inc. The Company subsequently changed its name to AcelRx Pharmaceuticals, Inc. and, on January 9, 2024 to Talphera, Inc. The Company’s operations are based in San Mateo, California. Talphera is a specialty pharmaceutical company focused on the development and commercialization of innovative therapies for use in medically supervised settings. The Company’s product development portfolio features Niyad™ (a regional anticoagulant for the dialysis circuit), LTX-608 (a nafamostat formulation for direct IV infusion) that the Company intends to develop for one or more of the following indications: disseminated intravascular coagulation, or DIC, acute respiratory distress syndrome, or ARDS, acute pancreatitis, or as an anti-viral treatment. On January 12, 2024, the Company and XOMA (US) LLC, or XOMA, entered into a Payment Interest Purchase Agreement, or the Purchase Agreement, for the sale by the Company to XOMA, in exchange for $8.0 million, of the Company’s right, title and interest in and to certain amounts payable to the Company, or collectively the Purchased Receivables, pursuant to the DSUVIA Agreement (as defined below) in respect of net sales of the Product (as defined below), excluding sales of DZUVEO by Laboratoire Aguettant, or Aguettant. See Note 4, “Sale of Future Payments” below for additional information. On March 12, 2023, the Company entered into an Asset Purchase Agreement, or the DSUVIA Agreement, with Vertical Pharmaceuticals, LLC, a wholly owned subsidiary of Alora Pharmaceuticals, LLC, or Alora, pursuant to which Alora agreed to acquire certain assets and assume certain liabilities of the Company relating to its sufentanil sublingual tablet product referred to as DSUVIA or DZUVEO, or any other single-dose pharmaceutical product for use in medically supervised settings containing a sublingual tablet that includes sufentanil as the sole active ingredient, as a 30 mcg tablet or other dosage form or strength as reasonably necessary for lifecycle management, or the Product. The closing of the DSUVIA Agreement occurred on April 3, 2023 (see Note 3, “Discontinued Operations” below). On January 7, 2022, the Company acquired Lowell Therapeutics, Inc., or Lowell, a privately held company (see Note 4, “Asset Acquisition” to the consolidated financial statements in the Company’s 2023 Annual Report on Form 10-K for additional information) and, as a result acquired the Niyad™ On July 14, 2021, the Company entered into a License and Commercialization Agreement, or the PFS Agreement, with Aguettant, pursuant to which the Company obtained the exclusive right to develop and, subject to FDA approval, commercialize in the United States an ephedrine pre-filled syringe for injection, and (ii) a phenylephrine PFS for injection. Aguettant will supply the Company with the products for use in commercialization, if they are approved in the U.S. See Note 5, “In-License Agreement” to the consolidated financial statements in the Company’s 2023 Annual Report on Form 10-K for additional information. Liquidity and Going Concern The condensed consolidated financial statements for the three and nine months ended September 30, 2024 were prepared on the basis of a going concern, which contemplates that the Company will be able to realize assets and discharge liabilities in the normal course of business. The Company has incurred recurring operating losses and negative cash flows from operating activities since inception and expects to continue to incur operating losses and negative cash flows in the future. These conditions raise substantial doubt about the Company’s ability to continue as a going concern. Considering the Company’s current cash resources and its current and expected levels of operating expenses for the next twelve months, management expects to need additional capital to fund its planned operations prior to the 12-month anniversary of the date this Quarterly Report on Form 10-Q is filed with the United States Securities and Exchange Commission, or the SEC. Management may seek to raise such additional capital through public or private equity offerings, including under the Controlled Equity Offering SM Additional funds may not be available when the Company needs them on terms that are acceptable to the Company, or at all. If adequate funds are not available, the Company may be required to further reduce its workforce, delay the ongoing clinical trial for Niyad, or delay the development of its regulatory filing plans for its product candidates in advance of the date on which the Company’s cash resources are exhausted to ensure that the Company has sufficient capital to meet its obligations and continue on a path designed to preserve stockholder value. In addition, if additional funds are raised through collaborations, strategic alliances or licensing arrangements with third parties, the Company may have to relinquish rights to its technologies, future revenue streams or product candidates, or to grant licenses on terms that may not be favorable to the Company. Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States, or GAAP, and with the rules and regulations of the U.S. Securities and Exchange Commission, or SEC, related to quarterly reports on Form 10-Q, and accordingly, they do not include all the information and disclosures required by GAAP for annual financial statements. These condensed consolidated financial statements and notes thereto should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, as filed with the SEC on March 6, 2024. The unaudited financial information for the interim periods presented herein reflects all adjustments, consisting of normal recurring adjustments, which, in the opinion of management, are necessary for a fair statement of its financial position and the condensed consolidated results of operations for the periods presented. Results of operations for interim periods covered by this Quarterly Report on Form 10-Q may not necessarily be indicative of results of operations for the full fiscal year or any other interim period. The condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiary. All intercompany accounts and transactions have been eliminated in consolidation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Management believes its most significant accounting estimates relate to fair value of warrants, impairment of long-lived assets, management’s assessment of going concern, revenue recognition, liability related to the sale of future payments and accrued clinical trial liabilities. Management evaluates its estimates on an ongoing basis including critical accounting policies. Estimates are based on historical experience and on various other market-specific and other relevant assumptions that the Company believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ from those estimates. Reclassifications Certain prior year amounts in the condensed consolidated financial statements have been reclassified to conform to the current year's presentation. In particular, other assets has been reclassified as prepaid expenses and other current assets in the condensed consolidated balance sheets, accounts receivable and other assets have been reclassified as prepaid expenses and other current assets and payment of employee tax obligations related to vesting of restricted stock units has been reclassified to net proceeds from issuance of common stock through equity plans in the condensed consolidated statement of cash flows and the portion of interest income and other income, net related to the revaluation of liability-classified warrants has been reclassified to change in fair value of warrants in the condensed consolidated statements of operations. Significant Accounting Policies The Company’s significant accounting policies are detailed in its Annual Report on Form 10-K for the year ended December 31, 2023. There have been no significant changes to the Company’s significant accounting policies during the three and nine months ended September 30, 2024, from those previously disclosed in its 2023 Annual Report on Form 10-K, except as follows: Sale of Future Payments On January 12, 2024, the Company entered into the Purchase Agreement with XOMA to monetize a portion of its future payments for commercial sales of DSUVIA and services performed by the Company to support sales of DSUVIA to the Department of Defense, or DoD, by Alora under the Marketing Agreement, and sales milestones under the DSUVIA Agreement. Refer to Note 4, “Sale of Future Payments” for further details on the Purchase Agreement. The Company recorded approximately $6.1 million, net of $0.5 million in issuance costs, of the $8.0 million proceeds as a liability, as this portion of the proceeds represents a sale of future revenues under ASC 470 for which the Company has continuing involvement in the generation of cash flows. The Company recorded approximately $1.2 million, net of $0.2 million in issuance costs, of the $8.0 million proceeds as other income, as this portion of proceeds represents the sale of all of the Company’s interest in future payments related to commercial sales of DSUVIA for which the Company is no longer entitled to receive such payments and has no further continuing involvement. The Company utilized internal estimates to develop a cash flow model based on business assumptions to determine the allocation of the proceeds. The liability related to the sale of future payments is recorded as debt and will be amortized under the effective interest rate method over the estimated life of the Purchase Agreement. The Company estimates the effective interest rate based on its estimate of total payments to be received by XOMA under the Purchase Agreement. The Company reassesses these estimates at each reporting date and adjusts the effective interest rate and amortization of the liability on a prospective basis, as necessary. The Company records the payments to XOMA as a reduction of the liability when paid. As such payments are made to XOMA, the balance of the liability will be effectively repaid over the life of the Purchase Agreement. Recently Issued Accounting Pronouncements In November 2023, the Financial Accounting Standards Board, or FASB, issued Accounting Standard Update, or ASU, 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, or ASU 2023-07, which requires all public entities, including public entities with a single reportable segment, to provide in interim and annual periods one or more measures of segment profit or loss used by the chief operating decision maker to allocate resources and assess performance. Additionally, the standard requires disclosures of significant segment expenses and other segment items as well as incremental qualitative disclosures. The guidance in this update is effective for fiscal years beginning after December 15, 2023, and interim periods after December 15, 2024. The Company is evaluating the disclosure impact of ASU 2023-07; however, the adoption of ASU 2023-07 will not have a material impact on the Company’s consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures The Company does not believe other recently issued but not yet effective accounting standards, if currently adopted, would have a material effect on the condensed consolidated financial statements.

Note 2 - Investments and Fair V

Note 2 - Investments and Fair Value Measurement	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Investments and Fair Value Measurement Disclosure [Text Block]	2. Investments and Fair Value Measurement Investments The Company classifies its marketable securities as available for sale and records its investments at fair value. Available-for-sale securities are carried at estimated fair value based on quoted market prices or observable market inputs of almost identical assets, with the unrealized holding gains and losses included in accumulated other comprehensive income (loss). As of September 30, 2024, and December 31, 2023, the contractual maturity of all investments held was less than one year. The tables below summarize the Company’s cash, cash equivalents and short-term investments (in thousands): As of September 30, 2024 Amortized Cost Gross Unrealized Gross Unrealized Fair Cash and cash equivalents: Cash $ 413 $ — $ — $ 413 Money market funds 1,925 — — 1,925 U.S. government agency securities 8,779 — — 8,779 Total cash and cash equivalents $ 11,117 $ — $ — $ 11,117 As of December 31, 2023 Amortized Cost Gross Unrealized Gross Unrealized Fair Cash and cash equivalents: Cash $ 1,342 $ — $ — $ 1,342 Money market funds 90 — — 90 U.S. government agency securities 1,896 — — 1,896 Commercial paper 2,393 — — 2,393 Total cash and cash equivalents 5,721 — — 5,721 Short-term investments: U.S. government agency securities 3,362 — — 3,362 Commercial paper 298 — — 298 Total short-term investments 3,660 — — 3,660 Total cash, cash equivalents, and short-term investments $ 9,381 $ — $ — $ 9,381 At each reporting date, the Company performs an evaluation of impairment to determine if any unrealized losses are the result of credit losses. Impairment is assessed at the individual security level. Factors considered in determining whether a loss resulted from a credit loss or other factors include the Company’s intent and ability to hold the investment until the recovery of its amortized cost basis, the extent to which the fair value is less than the amortized cost basis, the length of time and extent to which fair value has been less than the cost basis, the financial condition of the issuer, any historical failure of the issuer to make scheduled interest or principal payments, any changes to the rating of the security by a rating agency, any adverse legal or regulatory events affecting the issuer or issuer’s industry, any significant deterioration in economic conditions. There were no material realized or unrealized gains or losses on marketable securities for the three and nine months ended September 30, 2024 or the year ended December 31, 2023. As such, the Company did not record a credit allowance for the three and nine months ended September 30, 2024 or the year ended December 31, 2023. Fair Value Measurement The Company’s financial instruments consist of Level I and II assets. Money market funds are highly liquid investments and are actively traded. The pricing information on these investment instruments is readily available and can be independently validated as of the measurement date. This approach results in the classification of these securities as Level 1 of the fair value hierarchy. For Level II instruments, the Company estimates fair value by utilizing third-party pricing services in developing fair value measurements where fair value is based on valuation methodologies such as models using observable market inputs, including benchmark yields, reported trades, broker/dealer quotes, bids, offers and other reference data. Such Level II instruments typically include U.S. Treasury, U.S. government agency securities and commercial paper. As of September 30, 2024 and December 31, 2023, the Company held, in addition to Level II assets, a warrant liability related to the December 2022 Common Stock Warrants. The fair value of the warrant liability was estimated using the Black Scholes Model which uses as inputs the following weighted average assumptions: dividend yield, expected term in years; equity volatility; and risk-free interest rate. The Company follows the guidance in ASC 820 for its financial assets and liabilities that are re-measured and reported at fair value at each reporting period. The estimated fair value of the warrant liability represents a Level III measurement. Changes to the estimated fair value of these liabilities are recorded in change in fair value of warrant liability in the condensed consolidated statements of operations. The following tables set forth the fair value of the Company’s financial assets by level within the fair value hierarchy (in thousands): As of September 30, 2024 Fair Value Level I Level II Level III Assets Money market funds $ 1,925 $ 1,925 $ — $ — U.S. government agency securities 8,779 — 8,779 — Total assets measured at fair value $ 10,704 $ 1,925 $ 8,779 $ — Liabilities Warrant liability $ 2,084 $ — $ — $ 2,084 Total liabilities measured at fair value $ 2,084 $ — $ — $ 2,084 As of December 31, 2023 Fair Value Level I Level II Level III Assets Money market funds $ 90 $ 90 $ — $ — U.S. government agency securities 5,258 — 5,258 — Commercial paper 2,691 — 2,691 — Total assets measured at fair value $ 8,039 $ 90 $ 7,949 $ — Liabilities Warrant liability $ 1,778 $ — $ — $ 1,778 Total liabilities measured at fair value $ 1,778 $ — $ — $ 1,778 The following tables set forth a summary of the changes in the fair value of the Company’s Level III warrant liability for the three and nine months ended September 30, 2024 and 2023 (in thousands): ​ Three Months Ended September 30, 2024 Nine Months Ended September 30, 2024 Fair value—beginning of period ​ $ 2,325 ​ $ 1,778 (Gain) loss on change in fair value of December 2022 Common Stock Warrants liability ​ (241 ) ​ 306 Fair value—end of period ​ $ 2,084 ​ $ 2,084 ​ Three Months Ended September 30, 2023 Nine Months Ended September 30, 2023 Fair value—beginning of period ​ $ 3,086 ​ $ 7,098 Gain on change in fair value of December 2022 Common Stock Warrants liability ​ (1,706 ) ​ (5,718 ) Fair value—end of period ​ $ 1,380 ​ $ 1,380 The common warrants issued in December 2022 to purchase an aggregate of 4,227,052 shares of common stock, or the December 2022 Common Stock Warrants, were accounted for by the Company as a liability. At September 30, 2024, the December 2022 Common Stock Warrants were valued at approximately $2.1 million, using the Black-Scholes option pricing model as follows: exercise price of $2.07 per share, stock price of $0.8566 per share, expected life of 4.25 years, volatility of 99.6%, a risk-free rate of 3.58% and 0% expected dividend yield. There were no transfers between Level I, Level II or Level III of the fair value hierarchy during the three and nine months ended September 30, 2024 and the year ended December 31, 2023.

Note 3 - Discontinued Operation

Note 3 - Discontinued Operations	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	3. Discontinued Operations On March 12, 2023, the Company entered into the Asset Purchase Agreement with Alora for Alora’s acquisition of all assets related to DSUVIA, including inventories, equipment and intellectual property in exchange for consideration at closing of $1.1 million, a 15% payment on commercial sales of DSUVIA, 75% payment on sales of DSUVIA to the Department of Defense and up to $116.5 million in sales-based milestones. The transaction closed on April 3, 2023 (see Note 3, “Discontinued Operations” to the consolidated financial statements in the Company’s 2023 Annual Report on Form 10-K for additional information). The following table presents the results of the discontinued operations for the three- and nine-month periods ended September 30, 2024 and 2023 (in thousands): Three months ended September 30, Nine months ended September 30, 2024 2023 2024 2023 Total revenues $ — $ — $ — $ 501 Cost of goods sold — — — 711 Selling, general and administrative expense — 21 — 719 (Recovery) impairment of net assets held for sale — (82 ) — 6,853 Impairment of fixed assets — — — 1,065 Gain on termination of lease liabilities — — — (1,098 ) Research and development expenses — — — 349 Net income (loss) from discontinued operations $ — $ 61 $ — $ (8,098 ) The following table summarizes the carrying amounts of major classes of assets and liabilities of discontinued operations for each of the periods presented (in thousands).​ ​ September 30, 2024 December 31, 2023 Accrued liabilities $ 723 $ 731 Total current liabilities of discontinued operations 723 731 Net assets (liabilities) of discontinued operations $ (723 ) $ (731 ) The following table presents the significant non-cash items and purchases of property, plant and equipment for the discontinued operations that are included in the accompanying condensed consolidated statements of cash flows (in thousands): ​ Nine months ended ​ September 30, ​ 2024 2023 Cash flows from operating activities: Depreciation and amortization $ — $ 215 Stock-based compensation — 19 Impairment of net assets held for sale — 6,853 Impairment of fixed assets — 1,065 Gain on termination of lease liabilities — (1,098 ) Gain on extinguishment of debt — (400 ) Purchases of property and equipment — (100 )

Note 4 - Sale of Future Payment

Note 4 - Sale of Future Payments	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Sale of Future Payments [Text Block]	4. Sale of Future Payments In January 2024, the Company and XOMA entered into the Purchase Agreement for the sale by the Company to XOMA, in exchange for $8.0 million, of the Company’s right, title and interest in and to certain amounts payable to the Company, or collectively, the Purchased Receivables, pursuant to the DSUVIA Agreement in respect of net sales of the Product, excluding sales of the Product by Aguettant. The Purchased Receivables include: (i) 100% of certain payments based on net sales of the Product and potential sales-based milestone payments of up to $116.5 million in respect of net sales of the Product, in each case made on and after January 1, 2024 and excluding sales of the Product by Aguettant, and of certain associated license and acquisition payments relating to the Product, until XOMA has received $20.0 million of payments in respect of the foregoing, or the XOMA Threshold, or the Stepdown Date; and (ii) following the Stepdown Date, (A) 100% of payments based on net sales of the Product other than net sales to the United States Department of Defense, or DoD and (B) 50% of each of the following: (a) payments based on net sales of the Product to the DoD, (b) potential sales-based milestone payments in respect of net sales of the Product, and (c) certain associated license and acquisition payments relating to the Product. The Company has retained its right, title and interest in and to, following the Stepdown Date, 50% of each of the following: (a) payments based on net sales of the Product to the DoD, (b) potential sales-based milestone payments in respect of net sales of the Product, and (c) of certain associated license and acquisition payments relating to the Product. The Purchase Agreement contains customary representations, warranties and agreements by the Company and XOMA, indemnification obligations of the parties and other obligations of the parties. The allocation of the consideration for the Purchase Agreement resulted in proceeds of $1.4 million reduced by $0.2 million of transaction costs being allocated to the sale of all future interest in payments related to commercial sales of DSUVIA representing its fair value. As a result of the Company’s loss of control, no further continuing involvement in, or rights to future payments related to commercial sales of DSUVIA, the Company recognized other income of $1.2 million in January 2024. The Company evaluated the terms of the Purchase Agreement and concluded that the features of the Purchased Receivables are similar to those of a debt instrument. Accordingly, the Company recorded the allocated proceeds of approximately $6.6 million reduced by approximately $0.5 million of transaction costs, as a liability. The Company accounts for the value of the debt at amortized cost. The amounts received by the Company will be accreted to the total estimated amount of the payments necessary to extinguish the Company’s obligation under the Purchase Agreement, which will be recognized as interest expense. The carrying value of the debt will decrease for payments made to XOMA. The Company periodically assesses the expected payments for services performed to support sales of DSUVIA to the DoD by Alora under the Marketing Agreement and milestone payments under the DSUVIA Agreement using a combination of historical results, internal projections, and forecasts from external sources. To the extent such payments are greater or less than the Company’s initial estimates or the timing of such payments is materially different than its original estimates, the Company will prospectively adjust the amortization of the liability and the effective interest rate. Due to the significant judgments and factors related to the estimates of future payments under the Purchase Agreement, there are significant uncertainties surrounding the amount and timing of future payments. As the payments are remitted to XOMA, the liability will be effectively repaid over the life of the agreement. In order to determine the amortization of the liability related to the sale of future payments, the Company is required to estimate the total amount of future payments to XOMA over the life of the Purchase Agreement. In October 2024, Alora notified the Company that they are discontinuing their sales efforts on behalf of DSUVIA. At this time, the Company is uncertain as to the impact of this decision on sales of DSUVIA to the DoD. As a result, the Company estimates that future payments under the Purchase Agreement will be less than the proceeds from the sale of such future payments. Accordingly, the Company will not recognize any related non-cash interest expense. When the expected payments under the sale of future payments are lower than the gross proceeds of $6.6 million received, the Company defers recognition of any probable contingent gain until the Company has met its obligations under the liability related to the sale of future payments. For the three and nine months ended September 30, 2024, the estimated effective interest rate under the agreement was approximately 0% and 9%, respectively. The Company did not recognize any non-cash payment interest revenue and recognized non-cash interest expense of approximately $0.4 million during the nine months ended September 30, 2024. The interest and amortization of issuance costs are reflected as non-cash interest expense for the sale of future payments in the condensed consolidated statements of operations. The following table shows the activity within the liability account during the nine months ended September 30, 2024 and the period from inception to September 30, 2024 (in thousands): Nine months ended Period from September 30, 2024 Liability related to sale of future payments — beginning balance $ — $ — Proceeds from sale of future payments, net of issuance costs 6,133 6,133 Payments to XOMA — — Non-cash interest expense recognized 394 394 Liability related to sale of future payments as of September 30, 2024 $ 6,527 $ 6,527

Note 5 - Long-term Debt

Note 5 - Long-term Debt	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Long-Term Debt [Text Block]	5. Long-Term Debt Loan Agreement with Oxford On May 30, 2019, the Company entered into the Loan Agreement with Oxford Finance LLC, or Oxford, as the Lender. Under the Loan Agreement, the Lender made a term loan to the Company in an aggregate principal amount of $25.0 million, or the Loan, which was funded on May 30, 2019. In connection with the closing of the divestment of DSUVIA to Alora, on April 3, 2023, the Company paid Oxford the remaining amount due of approximately $3.4 million including accrued interest and fees under the Loan, and the Loan Agreement was terminated with no further obligations by either party. Interest expense related to the Loan Agreement was $0.1 million, which represented amortization of the debt discount, for the nine months ended September 30, 2023.

Note 6 - Commitments and Contin

Note 6 - Commitments and Contingencies	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	6. Commitments and Contingencies Litigation On June 8, 2021, a securities class action complaint was filed in the U.S. District Court for the Northern District of California against the Company and two On July 6, 2021, a purported shareholder derivative complaint was filed in the U.S. District Court for the Northern District of California. The complaint names ten of the Company’s officers and directors and asserts state and federal claims based on the same alleged misstatements as the securities class action complaint. On September 30, 2021, October 26, 2021, and November 17, 2021, three additional purported shareholder derivative complaints were filed in the U.S. District Court for the Northern District of California. The complaints name nine of the Company’s officers and directors and also assert state and federal claims based on the same alleged misstatements as the securities class action complaint. All four complaints seek unspecified damages, attorneys’ fees, and other costs. On December 6, 2021, the Court entered an order consolidating all four actions and staying the consolidated action pending the outcome of any motion to dismiss the securities class action. On February 16, 2024, another purported shareholder derivative complaint was filed in the Court of Chancery of the State of Delaware, asserting the same claims as those in the previously filed derivative actions. The case has been stayed pending the outcome of any motion to dismiss the securities class action. Please see “Part II., Item 1A. Risk Factors—Risks of a General Nature—Litigation may substantially increase our costs and harm our business.” The Company believes that these lawsuits are without merit and intends to vigorously defend against them. Given the uncertainty of litigation, the preliminary stage of the cases, and the legal standards that must be met for, among other things, class certification and success on the merits, the Company cannot estimate the reasonably possible loss or range of loss that may result from these actions. It is reasonably possible that this estimate may change in the near term. An adverse outcome regarding these matters could materially adversely affect the Company’s financial condition, results of operations, and cash flows.

Note 7 - Stockholders' Equity

Note 7 - Stockholders' Equity	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Equity [Text Block]	7. Stockholders Equity Common Stock January 2024 Private Placement On January 17, 2024, the Company entered into a private placement with certain institutional investors, or the Purchasers, for aggregate gross proceeds of $6.0 million upfront, an additional $10.0 million committed upon the announcement of positive clinical trial results for the Company’s NEPHRO CRRT study of Niyad, and an additional $2.0 million if Talphera stock trades above a specified price following the NEPHRO CRRT registration trial announcement, before deducting offering expenses payable by the Company, or the Private Placement. The terms of the Private Placement include: (i) the first tranche of the Private Placement, which closed on January 22, 2024, resulted in the aggregate gross proceeds to the Company of approximately $6.0 million for Pre-Funded Warrants to purchase up to 7,792,208 to purchase shares of the Company’s common stock, par value $0.001 per share, or the Common Stock, excluding the proceeds, if any, from the exercise of the Pre-Funded Warrants issued in such tranche (see Note 8, “Warrants” for additional information). (ii) the second tranche of the Private Placement, which is a conditional purchase by the Purchasers subject to either (a) the satisfaction or waiver of achieving, by September 30, 2024, the NEPHRO CRRT primary and one of the secondary clinical trial endpoints, resulting in the Company issuing pre-funded warrants to purchase up to 12,987,013 shares of Common Stock, and receiving additional aggregate gross proceeds of approximately $10.0 million, and/or (b) the satisfaction or waiver of the volume-weighted average price of the Common Stock for each of the immediately subsequent five (5) trading days following the Company’s announcement of its NEPHRO CRRT trial data being at least $0.92 per share, resulting in the Company issuing pre-funded warrants to purchase up to 2,597,402 shares of Common Stock and receiving additional aggregate gross proceeds of approximately $2.0 million. Any of the conditions in the second tranche can be waived by each Purchaser. The Company determined that the conditional tranche right is equity classified as it is indexed to the Company's own shares and meets all other conditions for equity classification and that the fair value of the right was immaterial at issuance. On September 30, 2024, the Company amended the securities purchase agreements of the Private Placement, dated January 17, 2024, with entities affiliated with Nantahala Management, LLC, or the Nantahala Agreements, to extend to June 30, 2025 the date by which the Company must achieve the precedent conditions to the second closing thereunder, or the Nantahala Amendments. If prior to the second closing, the Company consummates an equity financing, then the purchasers shall be released from their obligation to purchase additional shares of common stock and/or pre-funded warrants pursuant to the Nantahala Agreements, as amended. The Company determined that the Nantahala Amendments represented a modification but that no financial impact would be recorded as the difference between the fair values of the Nantahala Agreements immediately before and after the Nantahala Amendments was insignificant. The Private Placement contains customary representations, warranties and agreements by the Company and the Purchasers, indemnification rights and other obligations of the parties. Stock Plans Amended and Restated 2020 Equity Incentive Plan On June 24, 2024, at the 2024 Annual Meeting of Stockholders of the Company, upon the recommendation of the Company’s Board of Directors, the Company’s stockholders approved an amendment and restatement of the Company’s 2020 Equity Incentive Plan, or the Amended 2020 Plan, to increase the number of authorized shares reserved for issuance thereunder by 1,171,395 shares, subject to adjustment for certain changes in the Company’s capitalization. The aggregate number of shares of the Company’s common stock that may be issued under the Amended 2020 Plan will not exceed the sum of: (i) 3,161,395 shares, and (ii) up to 744,608 shares subject to outstanding awards granted under the 2011 Equity Incentive Plan that may become available for issuance under the Amended 2020 Plan, as such shares become available from time to time. Inducement Grant In May 2024, the Company granted stock-based awards outside of the existing stock plans to one new employee, or the Inducement Grant. These awards were granted as a material inducement for accepting employment with the Company, in accordance with Nasdaq Listing Rule 5635(c)(4). The inducement awards consisted of a total of 217,000 shares of the Company’s common stock, which includes an aggregate of 185,000 shares of common stock issuable upon the exercise of inducement stock option grants and 32,000 shares of common stock issuable upon the vesting of restricted stock unit awards generally subject to the same terms and conditions as grants that are made under the Company’s Amended 2020 Plan. Amended and Restated 2011 Employee Stock Purchase Plan Also on June 24, 2024, at the 2024 Annual Meeting of Stockholders of the Company, upon the recommendation of the Company’s Board of Directors, the Company’s stockholders approved an amendment and restatement of the Company’s 2011 Employee Stock Purchase Plan, or the Amended 2011 ESPP, to increase the number of authorized shares reserved for issuance thereunder by 100,000 shares, subject to adjustment for certain changes in the Company’s capitalization. The aggregate number of shares of the Company’s common stock that may be issued under the Amended 2011 ESPP is 345,000.

Note 8 - Warrants

Note 8 - Warrants	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Warrants Disclosure [Text Block]	8. Warrants The activity related to warrants during the nine months ended September 30, 2024, is summarized as follows: Common Stock from Warrants Weighted-average Outstanding at December 31, 2023 21,682,049 $ 1.40 Granted 7,792,208 $ 0.001 Outstanding at September 30, 2024 29,474,257 $ 0.96 Exercisable at September 30, 2024 29,474,257 $ 0.96 January 2024 Pre-Funded Warrants and Amendment of Prior Warrants On January 17, 2024, the Company entered into Securities Purchase Agreements (see Note 7, “Stockholders’ Equity” for additional information), relating to the issuance and sale of up to 7,792,208 pre-funded warrants to the Purchasers in a two-tranche private placement, or the Private Placement, to purchase shares of the Company’s Common Stock, at a purchase price of $0.769 per share and an exercise price of $0.001 per share, or the January 2024 Pre-Funded Warrants. The January 2024 Pre-Funded Warrants are exercisable immediately, subject to certain ownership restrictions, following each closing date of the Private Placement and have an unlimited term. The January 2024 Pre-Funded warrants were classified as a component of permanent equity in the Company's condensed consolidated balance sheet as they are freestanding financial instruments that are immediately exercisable, do not embody an obligation for the Company to repurchase its own shares and permit the holders to receive a fixed number of shares of common stock upon exercise. All of the shares underlying the January 2024 Pre-Funded warrants have been included in the weighted-average number of shares of common stock used to calculate net loss per share attributable to common stockholders because the shares may be issued for little or no consideration and are fully vested and are exercisable after their original issuance date. The January 2024 Pre-Funded warrants may participate with common shareholders in dividends or other distributions. In July 2023, in connection with a prior private placement, the Company issued to certain of the Purchasers (i) Series A common stock purchase warrants to purchase up to 3,676,473 shares of Common Stock and (ii) Series B common stock purchase warrants to purchase up to 3,676,473 shares of Common Stock (the “Prior Warrants”). In connection with the January 2024 Private Placement, the Company and the Purchasers agreed to amend and restate, 2,941,178 of each the Series A common stock purchase warrants and Series B common stock purchase warrants outstanding, by reducing their exercise price from $1.11 to $0.77 per share. Pursuant to ASU 2021-04, the Company remeasured the fair value of the amended and restated Prior Warrants as of the modification date based on the modified terms and recorded the increase in fair value of $0.3 million as equity issuance costs, all of which was allocated to additional paid in capital. The fair value assumptions related to the modification of these 5,882,356 amended and restated Prior Warrants as of January 17, 2024 were as follows: exercise price of $0.77 per share, stock price of $0.769 per share, expected life of 4.5 years, volatility of 96.91%, a risk-free rate of 4.02% and 0% expected dividend yield.

Note 9 - Stock-based Compensati

Note 9 - Stock-based Compensation	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Share-Based Payment Arrangement [Text Block]	9. Stock-Based Compensation The Company recorded total stock-based compensation expense for stock options, restricted stock units, or RSUs, granted under the Company’s equity incentive plans and the Inducement Grant, and the Amended 2011 ESPP, as follows (in thousands): Three Months Ended Nine Months Ended 2024 2023 2024 2023 Research and development $ 92 $ 210 $ 284 $ 383 Selling, general and administrative 142 168 475 1,016 Discontinued operations — — — 19 Total $ 234 $ 378 $ 759 $ 1,418 The following table summarizes restricted stock unit activity under the Company’s equity incentive plans and the Inducement Grant: Weighted Number of Average Restricted Grant Date Stock Units Fair Value Restricted stock units outstanding, January 1, 2024 86,232 $ 7.57 Granted 176,768 1.03 Vested (39,369 ) 12.08 Forfeited (7,385 ) 1.89 Restricted stock units outstanding, September 30, 2024 216,246 $ 1.59 Upon vesting, certain of the Company’s RSUs may be settled on a net-exercise basis to cover any required withholding tax with the remaining amount converted into an equivalent number of shares of common stock. There were 15,090 shares of common stock underlying vested RSUs that were withheld during the quarter ended March 31, 2024, based on the value of the RSUs as determined by the Company’s closing stock price on the applicable vesting date. The following table summarizes stock option activity under the Company’s equity incentive plans and the Inducement Grant: Number Options Weighted- Weighted- Aggregate (in thousands) January 1, 2024 893,321 $ 33.41 Granted 1,053,612 1.03 Forfeited (40,801 ) 1.65 Expired (26,326 ) 143.81 September 30, 2024 1,879,806 $ 14.40 7.7 $ 4 Vested and exercisable options— September 30, 2024 596,454 $ 38.67 4.6 $ 1 Vested and expected to vest— September 30, 2024 1,879,806 $ 14.40 7.7 $ 4 The per-share weighted average grant date fair value of the options granted during the nine months ended September 30, 2024 was estimated at $0.84 per share on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions: Nine months ended September 30, 2024 Expected term (in years) 6.5 Risk-free interest rate 4.29 % Expected volatility 98 % Expected dividend rate 0 % As of September 30, 2024, total stock-based compensation expense related to unvested options to be recognized in future periods was $1.2 million which is expected to be recognized over a weighted-average period of 2.6 years. As of September 30, 2024, there were 1,863,846 shares available for grant under the Company’s Amended 2020 Plan and 165,897 shares available for grant under the Company’s Amended 2011 ESPP.

Note 10 - Net Loss Per Share of

Note 10 - Net Loss Per Share of Common Stock	9 Months Ended
	Sep. 30, 2024
Notes to Financial Statements
Earnings Per Share [Text Block]	10. Net Loss per Share of Common Stock The Company’s basic net loss per share of common stock is calculated by dividing the net loss by the weighted average number of shares of common stock outstanding for the period. The diluted net loss per share of common stock is computed by giving effect to all potential common stock equivalents outstanding for the period determined using the treasury stock method. For purposes of this calculation, options to purchase common stock, RSUs, and warrants to purchase common stock were considered to be common stock equivalents. In periods with a reported net loss, common stock equivalents are excluded from the calculation of diluted net loss per share of common stock if their effect is antidilutive. Potential common shares that are issuable for little or no cash consideration, such as the Company’s pre-funded warrants issued in January 2024 and July 2023 with a de minimis exercise price of $0.001 per share, and the Company’s pre-funded warrants issued in December 2022 with a de minimis exercise price of $0.0001 per share, are considered outstanding common shares which are included in the calculation of basic and diluted net income (loss) per share in all circumstances. The following outstanding shares of common stock equivalents were excluded from the computation of diluted net loss per share of common stock for the periods presented because including them would have been antidilutive: Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 RSUs, stock options and ESPP to purchase common stock 2,096,052 959,169 2,096,052 959,169 Common stock warrants 20,265,576 20,265,576 20,265,576 20,265,576 In addition, the shares held back and contingently issuable in connection with the Lowell Merger, as described in Note 4, “Asset Acquisition” to the Company’s 2023 Annual Report on Form 10-K, have also been excluded from the computation of diluted net loss per share of common stock for the periods presented because the contingencies for issuance of these shares have not been met.

Insider Trading Arrangements

Insider Trading Arrangements	9 Months Ended
	Sep. 30, 2024
Insider Trading Arr Line Items
Material Terms of Trading Arrangement [Text Block]	Item 5. Other Information None
Rule 10b5-1 Arrangement Adopted [Flag]	false
Non-Rule 10b5-1 Arrangement Adopted [Flag]	false
Rule 10b5-1 Arrangement Terminated [Flag]	false
Non-Rule 10b5-1 Arrangement Terminated [Flag]	false

Significant Accounting Policies

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2024
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Basis of Presentation The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States, or GAAP, and with the rules and regulations of the U.S. Securities and Exchange Commission, or SEC, related to quarterly reports on Form 10-Q, and accordingly, they do not include all the information and disclosures required by GAAP for annual financial statements. These condensed consolidated financial statements and notes thereto should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023, as filed with the SEC on March 6, 2024. The unaudited financial information for the interim periods presented herein reflects all adjustments, consisting of normal recurring adjustments, which, in the opinion of management, are necessary for a fair statement of its financial position and the condensed consolidated results of operations for the periods presented. Results of operations for interim periods covered by this Quarterly Report on Form 10-Q may not necessarily be indicative of results of operations for the full fiscal year or any other interim period. The condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiary. All intercompany accounts and transactions have been eliminated in consolidation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. Management believes its most significant accounting estimates relate to fair value of warrants, impairment of long-lived assets, management’s assessment of going concern, revenue recognition, liability related to the sale of future payments and accrued clinical trial liabilities. Management evaluates its estimates on an ongoing basis including critical accounting policies. Estimates are based on historical experience and on various other market-specific and other relevant assumptions that the Company believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ from those estimates.
Reclassification, Comparability Adjustment [Policy Text Block]	Reclassifications Certain prior year amounts in the condensed consolidated financial statements have been reclassified to conform to the current year's presentation. In particular, other assets has been reclassified as prepaid expenses and other current assets in the condensed consolidated balance sheets, accounts receivable and other assets have been reclassified as prepaid expenses and other current assets and payment of employee tax obligations related to vesting of restricted stock units has been reclassified to net proceeds from issuance of common stock through equity plans in the condensed consolidated statement of cash flows and the portion of interest income and other income, net related to the revaluation of liability-classified warrants has been reclassified to change in fair value of warrants in the condensed consolidated statements of operations.
Revenue [Policy Text Block]	Sale of Future Payments On January 12, 2024, the Company entered into the Purchase Agreement with XOMA to monetize a portion of its future payments for commercial sales of DSUVIA and services performed by the Company to support sales of DSUVIA to the Department of Defense, or DoD, by Alora under the Marketing Agreement, and sales milestones under the DSUVIA Agreement. Refer to Note 4, “Sale of Future Payments” for further details on the Purchase Agreement. The Company recorded approximately $6.1 million, net of $0.5 million in issuance costs, of the $8.0 million proceeds as a liability, as this portion of the proceeds represents a sale of future revenues under ASC 470 for which the Company has continuing involvement in the generation of cash flows. The Company recorded approximately $1.2 million, net of $0.2 million in issuance costs, of the $8.0 million proceeds as other income, as this portion of proceeds represents the sale of all of the Company’s interest in future payments related to commercial sales of DSUVIA for which the Company is no longer entitled to receive such payments and has no further continuing involvement. The Company utilized internal estimates to develop a cash flow model based on business assumptions to determine the allocation of the proceeds. The liability related to the sale of future payments is recorded as debt and will be amortized under the effective interest rate method over the estimated life of the Purchase Agreement. The Company estimates the effective interest rate based on its estimate of total payments to be received by XOMA under the Purchase Agreement. The Company reassesses these estimates at each reporting date and adjusts the effective interest rate and amortization of the liability on a prospective basis, as necessary. The Company records the payments to XOMA as a reduction of the liability when paid. As such payments are made to XOMA, the balance of the liability will be effectively repaid over the life of the Purchase Agreement.
New Accounting Pronouncements, Policy [Policy Text Block]	Recently Issued Accounting Pronouncements In November 2023, the Financial Accounting Standards Board, or FASB, issued Accounting Standard Update, or ASU, 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, or ASU 2023-07, which requires all public entities, including public entities with a single reportable segment, to provide in interim and annual periods one or more measures of segment profit or loss used by the chief operating decision maker to allocate resources and assess performance. Additionally, the standard requires disclosures of significant segment expenses and other segment items as well as incremental qualitative disclosures. The guidance in this update is effective for fiscal years beginning after December 15, 2023, and interim periods after December 15, 2024. The Company is evaluating the disclosure impact of ASU 2023-07; however, the adoption of ASU 2023-07 will not have a material impact on the Company’s consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures The Company does not believe other recently issued but not yet effective accounting standards, if currently adopted, would have a material effect on the condensed consolidated financial statements.

Note 2 - Investments and Fair_2

Note 2 - Investments and Fair Value Measurement (Tables)	9 Months Ended
	Sep. 30, 2024
Notes Tables
Cash, Cash Equivalents and Investments [Table Text Block]	As of September 30, 2024 Amortized Cost Gross Unrealized Gross Unrealized Fair Cash and cash equivalents: Cash $ 413 $ — $ — $ 413 Money market funds 1,925 — — 1,925 U.S. government agency securities 8,779 — — 8,779 Total cash and cash equivalents $ 11,117 $ — $ — $ 11,117 As of December 31, 2023 Amortized Cost Gross Unrealized Gross Unrealized Fair Cash and cash equivalents: Cash $ 1,342 $ — $ — $ 1,342 Money market funds 90 — — 90 U.S. government agency securities 1,896 — — 1,896 Commercial paper 2,393 — — 2,393 Total cash and cash equivalents 5,721 — — 5,721 Short-term investments: U.S. government agency securities 3,362 — — 3,362 Commercial paper 298 — — 298 Total short-term investments 3,660 — — 3,660 Total cash, cash equivalents, and short-term investments $ 9,381 $ — $ — $ 9,381
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]	As of September 30, 2024 Fair Value Level I Level II Level III Assets Money market funds $ 1,925 $ 1,925 $ — $ — U.S. government agency securities 8,779 — 8,779 — Total assets measured at fair value $ 10,704 $ 1,925 $ 8,779 $ — Liabilities Warrant liability $ 2,084 $ — $ — $ 2,084 Total liabilities measured at fair value $ 2,084 $ — $ — $ 2,084 As of December 31, 2023 Fair Value Level I Level II Level III Assets Money market funds $ 90 $ 90 $ — $ — U.S. government agency securities 5,258 — 5,258 — Commercial paper 2,691 — 2,691 — Total assets measured at fair value $ 8,039 $ 90 $ 7,949 $ — Liabilities Warrant liability $ 1,778 $ — $ — $ 1,778 Total liabilities measured at fair value $ 1,778 $ — $ — $ 1,778
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	​ Three Months Ended September 30, 2024 Nine Months Ended September 30, 2024 Fair value—beginning of period ​ $ 2,325 ​ $ 1,778 (Gain) loss on change in fair value of December 2022 Common Stock Warrants liability ​ (241 ) ​ 306 Fair value—end of period ​ $ 2,084 ​ $ 2,084 ​ Three Months Ended September 30, 2023 Nine Months Ended September 30, 2023 Fair value—beginning of period ​ $ 3,086 ​ $ 7,098 Gain on change in fair value of December 2022 Common Stock Warrants liability ​ (1,706 ) ​ (5,718 ) Fair value—end of period ​ $ 1,380 ​ $ 1,380

Note 3 - Discontinued Operati_2

Note 3 - Discontinued Operations (Tables)	9 Months Ended
	Sep. 30, 2024
Notes Tables
Disposal Groups, Including Discontinued Operations [Table Text Block]	Three months ended September 30, Nine months ended September 30, 2024 2023 2024 2023 Total revenues $ — $ — $ — $ 501 Cost of goods sold — — — 711 Selling, general and administrative expense — 21 — 719 (Recovery) impairment of net assets held for sale — (82 ) — 6,853 Impairment of fixed assets — — — 1,065 Gain on termination of lease liabilities — — — (1,098 ) Research and development expenses — — — 349 Net income (loss) from discontinued operations $ — $ 61 $ — $ (8,098 ) ​ September 30, 2024 December 31, 2023 Accrued liabilities $ 723 $ 731 Total current liabilities of discontinued operations 723 731 Net assets (liabilities) of discontinued operations $ (723 ) $ (731 ) ​ Nine months ended ​ September 30, ​ 2024 2023 Cash flows from operating activities: Depreciation and amortization $ — $ 215 Stock-based compensation — 19 Impairment of net assets held for sale — 6,853 Impairment of fixed assets — 1,065 Gain on termination of lease liabilities — (1,098 ) Gain on extinguishment of debt — (400 ) Purchases of property and equipment — (100 )

Note 4 - Sale of Future Payme_2

Note 4 - Sale of Future Payments (Tables)	9 Months Ended
	Sep. 30, 2024
Notes Tables
Sale of Future Payments, Liabilities [Table Text Block]	Nine months ended Period from September 30, 2024 Liability related to sale of future payments — beginning balance $ — $ — Proceeds from sale of future payments, net of issuance costs 6,133 6,133 Payments to XOMA — — Non-cash interest expense recognized 394 394 Liability related to sale of future payments as of September 30, 2024 $ 6,527 $ 6,527

Note 8 - Warrants (Tables)

Note 8 - Warrants (Tables)	9 Months Ended
	Sep. 30, 2024
Notes Tables
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]	Common Stock from Warrants Weighted-average Outstanding at December 31, 2023 21,682,049 $ 1.40 Granted 7,792,208 $ 0.001 Outstanding at September 30, 2024 29,474,257 $ 0.96 Exercisable at September 30, 2024 29,474,257 $ 0.96

Note 9 - Stock-based Compensa_2

Note 9 - Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2024
Notes Tables
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Three Months Ended Nine Months Ended 2024 2023 2024 2023 Research and development $ 92 $ 210 $ 284 $ 383 Selling, general and administrative 142 168 475 1,016 Discontinued operations — — — 19 Total $ 234 $ 378 $ 759 $ 1,418
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]	Weighted Number of Average Restricted Grant Date Stock Units Fair Value Restricted stock units outstanding, January 1, 2024 86,232 $ 7.57 Granted 176,768 1.03 Vested (39,369 ) 12.08 Forfeited (7,385 ) 1.89 Restricted stock units outstanding, September 30, 2024 216,246 $ 1.59
Share-Based Payment Arrangement, Option, Activity [Table Text Block]	Number Options Weighted- Weighted- Aggregate (in thousands) January 1, 2024 893,321 $ 33.41 Granted 1,053,612 1.03 Forfeited (40,801 ) 1.65 Expired (26,326 ) 143.81 September 30, 2024 1,879,806 $ 14.40 7.7 $ 4 Vested and exercisable options— September 30, 2024 596,454 $ 38.67 4.6 $ 1 Vested and expected to vest— September 30, 2024 1,879,806 $ 14.40 7.7 $ 4
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Nine months ended September 30, 2024 Expected term (in years) 6.5 Risk-free interest rate 4.29 % Expected volatility 98 % Expected dividend rate 0 %

Note 10 - Net Loss Per Share _2

Note 10 - Net Loss Per Share of Common Stock (Tables)	9 Months Ended
	Sep. 30, 2024
Notes Tables
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2024 2023 2024 2023 RSUs, stock options and ESPP to purchase common stock 2,096,052 959,169 2,096,052 959,169 Common stock warrants 20,265,576 20,265,576 20,265,576 20,265,576

Note 1 - Organization and Sum_2

Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended
	Jan. 12, 2024	Jan. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	[1]
Liabilities Related To The Sale Of Future Payments			$ 6,527		$ 0
Issuance Costs, Sale Of Future Payments			$ (521)	$ 0
XOMA [Member]
Proceeds From Sale of Receivables	$ 8,000
Liabilities Related To The Sale Of Future Payments	6,100
Issuance Costs, Sale Of Future Payments	500
Other Income	1,200	$ 1,200
Other Expenses	$ 200
[1]The condensed consolidated balance sheet as of December 31, 2023 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.

Note 2 - Investments and Fair_3

Note 2 - Investments and Fair Value Measurement (Details Textual) $ / shares in Units, $ in Thousands	Sep. 30, 2024 USD ($) $ / shares	Dec. 31, 2023 USD ($)	[1]	Dec. 29, 2022 shares
Warrants and Rights Outstanding	$ 2,084	$ 1,778
Common Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares				4,227,052
Warrants and Rights Outstanding	$ 2,100
Common Warrants [Member] | Measurement Input, Exercise Price [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 2.07
Common Warrants [Member] | Measurement Input, Share Price [Member]
Warrants and Rights Outstanding, Measurement Input	0.8566
Common Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	4.25
Common Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.996
Common Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	3.58
Common Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0
[1]The condensed consolidated balance sheet as of December 31, 2023 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.

Note 2 - Investments and Fair_4

Note 2 - Investments and Fair Value Measurement - Summary of Cash, Cash Equivalents and Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Cash and cash equivalent, fair value		$ 5,721
Total cash and cash equivalents	$ 11,117	5,721	$ 13,389	$ 20,275
Total cash, cash equivalents, restricted cash and short-term investments		9,381
Total cash, cash equivalents and short-term investments, fair value		9,381
Marketable Securities [Member]
Amortized cost		3,660
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Commercial Paper [Member] | Marketable Securities [Member]
Amortized cost		298
Fair value		298
Gross Unrealized Gains		0
Gross Unrealized Losses		0
U.S. Government Agency Securities [Member] | Marketable Securities [Member]
Amortized cost		3,362
Fair value		3,362
Cash and Cash Equivalents [Member]
Total cash and cash equivalents	11,117
Cash and Cash Equivalents [Member] | Cash [Member]
Cash, amortized cost	413	1,342
Cash and cash equivalent, fair value	413	1,342
Cash and Cash Equivalents [Member] | Money Market Funds [Member]
Cash and cash equivalent, fair value	1,925	90
Money market funds, amortized cost	1,925	90
Cash and Cash Equivalents [Member] | US Government Agencies Debt Securities [Member]
Cash and cash equivalent, fair value	8,779	1,896
U.S government agency securities, amortized cost	$ 8,779	1,896
Cash and Cash Equivalents [Member] | Commercial Paper [Member]
Cash and cash equivalent, fair value		2,393
Commercial paper		$ 2,393

Note 2 - Investments and Fair_5

Note 2 - Investments and Fair Value Measurement - Fair Value of Financial Assets and Liabilities by Level Within Fair Value Hierarchy (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets, fair value	$ 10,704	$ 8,039
Liabilities, fair value	2,084	1,778
Fair Value, Inputs, Level 1 [Member]
Assets, fair value	1,925	90
Liabilities, fair value	0	0
Fair Value, Inputs, Level 2 [Member]
Assets, fair value	8,779	7,949
Liabilities, fair value	0	0
Fair Value, Inputs, Level 3 [Member]
Assets, fair value	0	0
Liabilities, fair value	2,084	1,778
Money Market Funds [Member]
Assets, fair value	1,925	90
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	1,925	90
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	0	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value	0	0
US Government Agencies Debt Securities [Member]
Assets, fair value	8,779	5,258
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value	0	0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value	8,779	5,258
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value	0	0
Commercial Paper [Member]
Assets, fair value		2,691
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Assets, fair value		0
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Assets, fair value		2,691
Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member]
Assets, fair value		0
Warrant Liability [Member]
Liabilities, fair value	2,084	1,778
Warrant Liability [Member] | Fair Value, Inputs, Level 1 [Member]
Liabilities, fair value	0	0
Warrant Liability [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities, fair value	0	0
Warrant Liability [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities, fair value	$ 2,084	$ 1,778

Note 2 - Investments and Fair_6

Note 2 - Investments and Fair Value Measurement - Summary of Changes in Fair Value of Level III Financial Liabilities (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair value—beginning of period	$ 2,325	$ 3,086	$ 1,778	$ 7,098
(Gain) loss on change in fair value of December 2022 Common Stock Warrants liability	(241)	(1,706)	306	(5,718)
Fair value—end of period	$ 2,084	$ 1,380	$ 2,084	$ 1,380

Note 3 - Discontinued Operati_3

Note 3 - Discontinued Operations (Details Textual) - Discontinued Operations [Member] - DSUVIA [Member] $ in Millions	Mar. 12, 2023 USD ($)
Disposal Group, Including Discontinued Operation, Consideration	$ 1.1
Disposal Group, Including Discontinued Operation, Percentage of Royalty on Commercial Sales	15%
Disposal Group, Including Discontinued Operation, Maximum Amount in Sales-based Milestone	$ 116.5
Department of Defense [Member]
Disposal Group, Including Discontinued Operation, Percentage of Royalty on Commercial Sales	75%

Note 3 - Discontinued Operati_4

Note 3 - Discontinued Operations - Summary of Discontinued Operation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Impairment of net assets held for sale			$ 0	$ 6,853
Impairment of fixed assets			0	1,065
Gain on termination of lease liabilities			0	(1,098)
Gain on extinguishment of debt			0	(400)
Purchases of property and equipment			0	(100)
Gain on termination of lease liabilities			0	(1,098)
Discontinued Operations [Member] | DSUVIA [Member]
Total revenues	$ 0	$ 0	0	501
Accrued liabilities	723		723		$ 731
Depreciation and amortization			0	215
Total current liabilities of discontinued operations	723		723		731
Stock-based compensation			0	19
Cost of goods sold	0	0	0	711
Net assets (liabilities) of discontinued operations	(723)		(723)		$ (731)
Impairment of net assets held for sale			0	6,853
Impairment of fixed assets	0	0	0	1,065
Selling, general and administrative expense	0	21	0	(719)
Gain on termination of lease liabilities	0	0	0	(1,098)
Gain on extinguishment of debt			0	(400)
(Recovery) impairment of net assets held for sale	0	(82)	0	6,853
Purchases of property and equipment			0	(100)
Gain on termination of lease liabilities	0	0	0	(1,098)
Research and development expenses	0	0	0	349
Net income (loss) from discontinued operations	$ 0	$ 61	$ 0	$ (8,098)

Note 4 - Sale of Future Payme_3

Note 4 - Sale of Future Payments (Details Textual) - USD ($)			1 Months Ended	9 Months Ended
	Jan. 13, 2024	Jan. 12, 2024	Jan. 31, 2024	Sep. 30, 2024
Noncash Interest Expense Recognized				$ 394,000
XOMA [Member]
Proceeds From Sale of Receivables		$ 8,000,000
License Agreement, Percentage of Royalty Payments Based on Net Sales and Milestone Payments		100%
License Agreement, Milestone Payments to be Paid, Maximum		$ 116,500,000
License Agreement, Threshold Payments Relating to Product		20
Transaction Costs From Sale of Receivables				500,000
Other Income		$ 1,200,000	$ 1,200,000
Proceeds from Debt, Net of Issuance Costs				$ 6,600,000
Debt Instrument, Interest Rate, Effective Percentage				9%
Noncash Interest Expense Recognized				$ 400,000
XOMA [Member] | Agreement After Stepdown Date [Member]
Proceeds From Sale of Receivables	$ 1,400,000
License Agreement, Percentage of Royalty Payments Based on Net Sales and Milestone Payments		50%
License Agreement, Percentage of Royalty Payments Excluding Department of Defense Sales and Milestone Payments		100%
Transaction Costs From Sale of Receivables	$ 200,000

Note 4 - Sale of Future Payme_4

Note 4 - Sale of Future Payments - Schedule of Future Payment Liabilities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($)
Balance	$ 0	[1]
Proceeds from sale of future payments, net of issuance costs	6,133
Non-cash interest expense recognized	394
Balance	6,527
XOMA [Member]
Payments to XOMA	0
Non-cash interest expense recognized	$ 400
[1]The condensed consolidated balance sheet as of December 31, 2023 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023.

Note 5 - Long-term Debt (Detail

Note 5 - Long-term Debt (Details Textual) - USD ($) $ in Thousands		9 Months Ended
	Apr. 03, 2023	Sep. 30, 2024	Sep. 30, 2023	May 30, 2019
Amortization of Debt Discount (Premium)		$ 0	$ 53
Loan Agreement with Oxford Finance LLC [Member]
Debt Instrument, Face Amount				$ 25,000
Repayments of Debt	$ 3,400
Amortization of Debt Discount (Premium)			$ 100

Note 6 - Commitments and Cont_2

Note 6 - Commitments and Contingencies (Details Textual)	Jun. 08, 2021
Purported Shareholder v. Company - Violation of Sections 10(b) and 20(a) of the Exchange Act and SEC Rule 10b-5 [Member]
Loss Contingency, Number of Defendants	2

Note 7 - Stockholders' Equity (

Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions				1 Months Ended	9 Months Ended
	Jun. 24, 2024	Jan. 22, 2024	Jan. 17, 2024	May 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Common Stock, Par or Stated Value Per Share (in dollars per share)					$ 0.001	$ 0.001
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)					1,879,806	893,321
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)					1,053,612
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)					176,768
The 2020 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	1,171,395
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant					1,863,846
The 2020 Equity Incentive Plan [Member] | Maximum [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)	3,161,395
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number (in shares)	744,608
Inducement Grant [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)				217,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)				185,000
Inducement Grant [Member] | Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)				32,000
Employee Stock Purchase Plan (ESPP) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)	100,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant	345,000
The January 2024 Private Placement [Member]
Proceeds from Issuance of Common Stock			$ 6
The January 2024 Private Placement [Member] | Prefunded 2024 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			7,792,208
The January 2024 Private Placement [Member] | Pivotal Trail Milestone [Member]
Proceeds from Issuance of Common Stock			$ 10
The January 2024 Private Placement [Member] | Pivotal Trail Milestone [Member] | Prefunded 2024 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			12,987,013
The January 2024 Private Placement [Member] | Pivotal Share Price Milestone [Member]
Proceeds from Issuance of Common Stock			$ 2
Sale of Equity, Share Price Milestone (in dollars per share)			$ 0.92
The January 2024 Private Placement [Member] | Pivotal Share Price Milestone [Member] | Prefunded 2024 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)			2,597,402
The January 2024 Private Placement [Member] | Share-Based Payment Arrangement, Tranche One [Member]
Proceeds from Issuance of Common Stock		$ 6
Common Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.001
The January 2024 Private Placement [Member] | Share-Based Payment Arrangement, Tranche One [Member] | Prefunded 2024 Warrants [Member]
Stock Issued During Period, Shares, New Issues		7,792,208

Note 8 - Warrants (Details Text

Note 8 - Warrants (Details Textual) $ / shares in Units, $ in Thousands		9 Months Ended
	Jan. 17, 2024 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($)	Dec. 31, 2023 shares	Jul. 31, 2023 shares
Class of Warrant or Right, Outstanding (in shares)		29,474,257		21,682,049
Equity Issuance Costs, Modification of Warrants | $		$ 251	$ 0
The January 2024 Private Placement [Member]
Shares Issued, Price Per Share (in dollars per share) | $ / shares	$ 0.769
Prefunded 2024 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	0.001
Prefunded 2024 Warrants [Member] | Maximum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	1.11
Prefunded 2024 Warrants [Member] | Minimum [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 0.77
Prefunded 2024 Warrants [Member] | Common Class A [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					3,676,473
Prefunded 2024 Warrants [Member] | Common Class B [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)					3,676,473
Prefunded 2024 Warrants [Member] | The January 2024 Private Placement [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	7,792,208
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 0.001
Modified January 2024 Warrants [Member]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)	5,882,356
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares	$ 0.77
Equity Issuance Costs, Modification of Warrants | $	$ 300
Warrants and Rights Outstanding, Measurement Input	0.769
Modified January 2024 Warrants [Member] | Measurement Input, Expected Term [Member]
Warrants and Rights Outstanding, Measurement Input	4.5
Modified January 2024 Warrants [Member] | Measurement Input, Price Volatility [Member]
Warrants and Rights Outstanding, Measurement Input	0.9691
Modified January 2024 Warrants [Member] | Measurement Input, Risk Free Interest Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0.0402
Modified January 2024 Warrants [Member] | Measurement Input, Expected Dividend Rate [Member]
Warrants and Rights Outstanding, Measurement Input	0
Modified January 2024 Warrants [Member] | Common Class A [Member]
Class of Warrant or Right, Outstanding (in shares)	2,941,178
Modified January 2024 Warrants [Member] | Common Class B [Member]
Class of Warrant or Right, Outstanding (in shares)	2,941,178

Note 8 - Warrants - Summary of

Note 8 - Warrants - Summary of Warrants Activity (Details)	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Outstanding, warrants (in shares) | shares	21,682,049
Granted, warrants (in shares) | shares	7,792,208
Granted, warrants, weighted average exercise price (in dollars per share) | $ / shares	$ 0.001
Outstanding, warrants (in shares) | shares	29,474,257
Exercisable, warrants (in shares) | shares	29,474,257
Weighted Average [Member]
Outstanding, warrants, weighted average exercise price (in dollars per share) | $ / shares	$ 1.4
Outstanding, warrants, weighted average exercise price (in dollars per share) | $ / shares	0.96
Exercisable, warrants, weighted average exercise price (in dollars per share) | $ / shares	$ 0.96

Note 9 - Stock-based Compensa_3

Note 9 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares	$ 0.84
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $	$ 1.2
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition	2 years 7 months 6 days
The 2020 Equity Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant	1,863,846
Amended ESPP [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant	165,897
Restricted Stock Units (RSUs) [Member]
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	15,090

Note 9 - Stock-based Compensa_4

Note 9 - Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Stock-based compensation expense	$ 234	$ 378	$ 759	$ 1,418
Research and Development Expense [Member]
Stock-based compensation expense	92	210	284	383
Selling, General and Administrative Expenses [Member]
Stock-based compensation expense	142	168	475	1,016
Discontinued Operation [Member]
Stock-based compensation expense	$ 0	$ 0	$ 0	$ 19

Note 9 - Stock-based Compensa_5

Note 9 - Stock-based Compensation - Restricted Stock Activity (Details) - Restricted Stock Units (RSUs) [Member]	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Restricted stock units outstanding (in shares) | shares	86,232
Restricted stock units weighted average outstanding (in dollars per share) | $ / shares	$ 7.57
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | shares	176,768
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	$ 1.03
Vested (in shares) | shares	(39,369)
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	$ 12.08
Forfeited (in shares) | shares	(7,385)
Weighted average grant date fair value, forfeited (in dollars per share) | $ / shares	$ 1.89
Restricted stock units outstanding (in shares) | shares	216,246
Restricted stock units weighted average outstanding (in dollars per share) | $ / shares	$ 1.59

Note 9 - Stock-based Compensa_6

Note 9 - Stock-based Compensation - Option Activity (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares
Stock options outstanding (in shares) | shares	893,321
Stock options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 33.41
Granted (in shares) | shares	1,053,612
Granted, weighted-average exercise price (in dollars per share) | $ / shares	$ 1.03
Forfeited (in shares) | shares	(40,801)
Forfeited, weighted-average exercise price (in dollars per share) | $ / shares	$ 1.65
Expired (in shares) | shares	(26,326)
Expired, weighted-average exercise price (in dollars per share) | $ / shares	$ 143.81
Stock options outstanding (in shares) | shares	1,879,806
Stock options outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 14.4
Stock options outstanding, weighted average remaining contractual life (Year)	7 years 8 months 12 days
Stock options outstanding, aggregate intrinsic value | $	$ 4
Vested and exercisable options (in shares) | shares	596,454
Vested and exercisable options, weighted-average exercise price (in dollars per share) | $ / shares	$ 38.67
Vested and exercisable options, weighted-average remaining contractual life (Year)	4 years 7 months 6 days
Vested and exercisable options, aggregate intrinsic value | $	$ 1
Vested and expected to vest (in shares) | shares	1,879,806
Vested and expected to vest, weighted-average exercise price (in dollars per share) | $ / shares	$ 14.4
Vested and expected to vest, weighted-average remaining contractual life (Year)	7 years 8 months 12 days
Vested and expected to vest, aggregate intrinsic value | $	$ 4

Note 9 - Stock-based Compensa_7

Note 9 - Stock-based Compensation - Assumptions to Calculate Fair Value of Each Employee Stock Option (Details) - Weighted Average [Member] - Time-based Stock Option [Member]	9 Months Ended
	Sep. 30, 2024
Expected term (Year)	6 years 6 months
Risk-free interest rate	4.29%
Expected volatility	98%
Expected dividend rate	0%

Note 10 - Net Loss Per Share _3

Note 10 - Net Loss Per Share of Common Stock (Details Textual) - $ / shares	Jan. 17, 2024	Jul. 31, 2023	Dec. 29, 2022
Prefunded 2024 Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)	$ 0.001
The 2023 Prefunded Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)		$ 0.001
The 2022 Prefunded Warrants [Member]
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)			$ 0.0001

Note 10 - Net Loss Per Share _4

Note 10 - Net Loss Per Share of Common Stock - Common Stock Excluded From Computation of Diluted Net Loss Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
RSU's, ESPP, and Employee Stock Options [Member]
Antidilutive securities (in shares)	2,096,052	959,169	2,096,052	959,169
Warrant [Member]
Antidilutive securities (in shares)	20,265,576	20,265,576	20,265,576	20,265,576