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Summary of Significant Accounting Policies (Additional Information) (Details)	3 Months Ended
	Mar. 31, 2026 Segment
Accounting Policies [Abstract]
Number of reportable segment	1
Number of operating segment	1

Net Loss Per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Numerator:
Net Income (Loss)	$ (12,266)	$ (14,041)
Denominator:
Weighted-average shares of common stock outstanding, basic	1,372,084	586,142
Weighted-average shares of common stock outstanding, diluted	1,372,084	586,142
Net loss per share, basic	$ (8.94)	$ (23.95)
Net loss per share, diluted	$ (8.94)	$ (23.95)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 32: http://www.xbrl.org/2003/role/disclosureRef
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Reference 34: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 35: http://www.xbrl.org/2003/role/disclosureRef
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Reference 36: http://www.xbrl.org/2003/role/disclosureRef
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Reference 37: http://www.xbrl.org/2003/role/disclosureRef
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Reference 38: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1B
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Reference 39: http://www.xbrl.org/2003/role/disclosureRef
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Reference 40: http://www.xbrl.org/2003/role/disclosureRef
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Reference 41: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 42: http://www.xbrl.org/2003/role/disclosureRef
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Reference 43: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (a)
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Reference 44: http://www.xbrl.org/2003/role/disclosureRef
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Reference 46: http://www.xbrl.org/2003/role/disclosureRef
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Reference 48: http://www.xbrl.org/2003/role/disclosureRef
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Reference 49: http://fasb.org/us-gaap/role/ref/legacyRef
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+ Details

Capital Structure - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2026	Dec. 31, 2025
Class Of Stock [Line Items]
Common stock shares authorized	200,000,000	200,000,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stockholders voting rights	one vote
Common stock dividends declared	$ 0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

License Agreements	3 Months Ended
Mar. 31, 2026
Research and Development [Abstract]
License Agreements	7. License Agreements BioMarin Pharmaceutical, Inc. On October 4, 2024, the Company entered into that certain Asset Purchase Agreement (the “Allievex Purchase Agreement”) with AVX (ABC), LLC, a Delaware limited liability company, in its sole and limited capacity as the assignee for the benefit of creditors of Allievex Corporation (“Allievex”). Pursuant to the Allievex Purchase Agreement, the Company acquired all intellectual property and inventory relating to Allievex's product candidates and that certain Exclusive License Agreement, by and between BioMarin Pharmaceutical Inc. (“BioMarin”) and Allievex, dated October 22, 2019 (the “BioMarin License Agreement”). As consideration, the Company paid $5.0 million to Allievex in November 2024. The Company also assumed certain liabilities of Allievex of $7.8 million, which have been fully paid as of March 31, 2026. The Company also recorded an estimated receivable of $2.6 million in other current assets on the balance sheet related to the completed Allievex bankruptcy proceedings which was fully collected by the Company in January 2026. The Company also assumed the obligations of Allievex to pay BioMarin up to $25.5 million for the first MPS IIIB product and up to an aggregate of $100.0 million per licensed product upon the achievement of certain sales milestones. In addition, the Company is required to pay to BioMarin certain (i) high-single digit to low-double digit tiered royalties on aggregate annual net sales of licensed MPS IIIB products during the applicable royalty term, subject to certain customary reductions and floors. No amounts were paid by the Company to BioMarin nor were any due as of March 31, 2026. The Company may terminate the BioMarin License Agreement at any time for convenience upon prior written notice provided within a specified period of time. BioMarin may terminate the BioMarin License Agreement upon written notice if the Company (i) challenges the validity, enforceability or scope of any of the patents licensed by the Company under the BioMarin License Agreement, subject to certain conditions, or (ii) ceases all material research and development activity for any licensed product for a specified period of time, subject to certain exceptions. Either the Company or BioMarin may also terminate the BioMarin License Agreement (i) in the event the other party shall have materially breached its obligations thereunder and such default shall have continued for a specified period after written notice thereof or (ii) upon the bankruptcy or insolvency of the other party. HBM Alpha Therapeutics, Inc. On January 15, 2025, the Company entered into a collaboration and license agreement (the “HBM License Agreement”) with HBM Alpha Therapeutics, Inc. (“HBM”). Under the terms of the HBM License Agreement, HBM granted the Company a limited exclusivity, royalty bearing, and sublicensable license to certain technology, patent rights, manufacturing rights, know-how, and proprietary materials relating to SPR202. As consideration, the Company made a one-time upfront payment to HBM of $5.0 million in February 2025. Additionally, in January 2025, the Company issued pre-funded warrants to HBM and its affiliates that in total were to be equal to 4.99% of the Company's outstanding common stock as of the date of exercise of such pre-funded warrants. In June 2025, the Company amended the pre-funded warrants to extend the exercise period to December 2025. In December 2025, these pre-funded warrants were fully exercised. The Company concluded that the rights acquired under the HBM License Agreement have no alternative future use. Therefore, the consideration paid of $5.0 million, along with the initial fair value of the pre-funded warrants issued of $0.7 million, was recognized as acquired in-process research and development expense, which was reported as a component of research and development expense for the three months ended March 31, 2025. The Company is also obligated to pay HBM up to an aggregate of $390.0 million upon the achievement of certain development, regulatory, and sales milestones. In addition, the Company is required to pay to HBM certain mid to high-single digit tiered royalties on aggregate annual net sales of licensed products during the applicable royalty term, subject to certain customary reductions. The Company may terminate the HBM License Agreement on a licensed product-by-licensed product basis or in its entirety at any time for convenience upon prior written notice provided within a specified period of time. Either the Company or HBM may also terminate the HBM License Agreement (i) in the event the other party shall have materially breached its obligations thereunder and such default shall have continued for a specified period after written notice thereof or (ii) upon the bankruptcy or insolvency of the other party. HBM may terminate the HBM License Agreement upon prior written notice if the Company (i) ceases all development or commercialization activities for a specified period of time, subject to certain exceptions, or (ii) challenges the validity, enforceability or scope of any of the patents licensed by the Company to HBM under the HBM License Agreement, subject to certain conditions.

License Agreements

3 Months Ended

Mar. 31, 2026

Research and Development [Abstract]

License Agreements

7. License Agreements

BioMarin Pharmaceutical, Inc.

On October 4, 2024, the Company entered into that certain Asset Purchase Agreement (the “Allievex Purchase Agreement”) with AVX (ABC), LLC, a Delaware limited liability company, in its sole and limited capacity as the assignee for the benefit of creditors of Allievex Corporation (“Allievex”). Pursuant to the Allievex Purchase Agreement, the Company acquired all intellectual property and inventory relating to Allievex's product candidates and that certain Exclusive License Agreement, by and between BioMarin Pharmaceutical Inc. (“BioMarin”) and Allievex, dated October 22, 2019 (the “BioMarin License Agreement”).

As consideration, the Company paid $5.0 million to Allievex in November 2024. The Company also assumed certain liabilities of Allievex of $7.8 million, which have been fully paid as of March 31, 2026. The Company also recorded an estimated receivable of $2.6 million in other current assets on the balance sheet related to the completed Allievex bankruptcy proceedings which was fully collected by the Company in January 2026.

The Company also assumed the obligations of Allievex to pay BioMarin up to $25.5 million for the first MPS IIIB product and up to an aggregate of $100.0 million per licensed product upon the achievement of certain sales milestones. In addition, the Company is required to pay to BioMarin certain (i) high-single digit to low-double digit tiered royalties on aggregate annual net sales of licensed MPS IIIB products during the applicable royalty term, subject to certain customary reductions and floors. No amounts were paid by the Company to BioMarin nor were any due as of March 31, 2026.

The Company may terminate the BioMarin License Agreement at any time for convenience upon prior written notice provided within a specified period of time. BioMarin may terminate the BioMarin License Agreement upon written notice if the Company (i) challenges the validity, enforceability or scope of any of the patents licensed by the Company under the BioMarin License Agreement, subject to certain conditions, or (ii) ceases all material research and development activity for any licensed product for a specified period of time, subject to certain exceptions. Either the Company or BioMarin may also terminate the BioMarin License Agreement (i) in the event the other party shall have materially breached its obligations thereunder and such default shall have continued for a specified period after written notice thereof or (ii) upon the bankruptcy or insolvency of the other party.

HBM Alpha Therapeutics, Inc.

On January 15, 2025, the Company entered into a collaboration and license agreement (the “HBM License Agreement”) with HBM Alpha Therapeutics, Inc. (“HBM”). Under the terms of the HBM License Agreement, HBM granted the Company a limited exclusivity, royalty bearing, and sublicensable license to certain technology, patent rights, manufacturing rights, know-how, and proprietary materials relating to SPR202.

As consideration, the Company made a one-time upfront payment to HBM of $5.0 million in February 2025. Additionally, in January 2025, the Company issued pre-funded warrants to HBM and its affiliates that in total were to be equal to 4.99% of the Company's outstanding common stock as of the date of exercise of such pre-funded warrants. In June 2025, the Company amended the pre-funded warrants to extend the exercise period to December 2025. In December 2025, these pre-funded warrants were fully exercised.

The Company concluded that the rights acquired under the HBM License Agreement have no alternative future use. Therefore, the consideration paid of $5.0 million, along with the initial fair value of the pre-funded warrants issued of $0.7 million, was recognized as acquired in-process research and development expense, which was reported as a component of research and development expense for the three months ended March 31, 2025.

The Company is also obligated to pay HBM up to an aggregate of $390.0 million upon the achievement of certain development, regulatory, and sales milestones. In addition, the Company is required to pay to HBM certain mid to high-single digit tiered royalties on aggregate annual net sales of licensed products during the applicable royalty term, subject to certain customary reductions.

The Company may terminate the HBM License Agreement on a licensed product-by-licensed product basis or in its entirety at any time for convenience upon prior written notice provided within a specified period of time. Either the Company or HBM may also terminate the HBM License Agreement (i) in the event the other party shall have materially breached its obligations thereunder and such default shall have continued for a specified period after written notice thereof or (ii) upon the bankruptcy or insolvency of the other party. HBM may terminate the HBM License Agreement upon prior written notice if the Company (i) ceases all development or commercialization activities for a specified period of time, subject to certain exceptions, or (ii) challenges the validity, enforceability or scope of any of the patents licensed by the Company to HBM under the HBM License Agreement, subject to certain conditions.

Debt

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Term Loan

6. Debt

Avenue Loan

On January 7, 2026 (the “Avenue Closing Date”), the Company entered into a Loan and Security Agreement (the “Avenue Loan and Security Agreement”) and a Supplement to the Loan and Security Agreement (together with the Avenue Loan and Security Agreement, the “Avenue Loan Agreement”), with Avenue Capital Management II, L.P., as administrative agent and collateral agent (the “Agent”) and Avenue Venture Opportunities Fund II, L.P., as lender (the “Lender”, together with the Agent, “Avenue”).

The Avenue Loan Agreement makes available to the Company term loans in an aggregate principal amount of up to $50.0 million with (i) $15.0 million funded within 5 business days after the Avenue Closing Date (“Tranche 1”), (ii) up to $10.0 million to be made available to the Company between March 1, 2026 and September 30, 2026, subject to, among other things, the Company’s achievement of a key regulatory milestone related to the Company’s development of TA-ERT for the treatment of Sanfilippo Syndrome Type B (“MPS IIIB”) (“Tranche 2”) and (iii) up to $15.0 million to be made available to the Company between September 1, 2026 and March 31, 2027, subject to, among other things, the Company’s achievement of an additional key regulatory milestone with respect to the Company’s development of TA-ERT for the treatment of MPS IIIB (“Tranche 3”). The Lender may make additional term loans of up to an additional $10.0 million (the “Discretionary Tranche 4” and collectively with Tranche 1, Tranche 2 and Tranche 3, the “Avenue Loans”), to be funded between October 1, 2027 and June 30, 2028, subject to, among other things, (i) the Company’s achievement of a certain commercial milestone and (ii) the mutual written agreement of the Company and the Lender (upon the Lender’s investment committee approval). The Avenue Loans bear interest at an annual rate equal to the greater of (x) the sum of 5.25% plus the prime rate as reported in The Wall Street Journal and (y) 12.25%. The Avenue Loans are secured by a lien upon and security interest in all of the Company’s assets, including intellectual property, subject to agreed exceptions. The maturity date of the Avenue Loans is July 1, 2029 (the “Avenue Maturity Date”). The Avenue Loan Agreement does not contain any minimum cash requirement or other financial covenants. As of March 31, 2026, the stated interest rate of the Avenue Loans was 12.25%.

The Company will make interest only payments on the Avenue Loans until the 12-month anniversary of the Avenue Closing Date, subject to (i) a 6-month extension, so long as at least $5.0 million from Tranche 2 has been funded and (ii) an additional 12-month extension if the Company achieves the Tranche 3 milestone. The Avenue Loans principal is repayable in equal monthly installments from the end of interest only period to the Avenue Maturity Date.

The Company may, at its option at any time, prepay the Avenue Loans in their entirety by paying the then-outstanding principal balance and all accrued and unpaid interest on the Avenue Loans, subject to a prepayment fee equal to (i) 3.0% of the principal amount outstanding if the prepayment occurs on or prior to the first anniversary following the Avenue Closing Date, (ii) 2.0% of the principal amount outstanding if the prepayment occurs after the first anniversary following the Avenue Closing Date, but on or prior to the second anniversary following the Avenue Closing Date, and (iii) 1.0% of the principal amount outstanding if the prepayment occurs after the second anniversary following the Avenue Closing Date. The Company will pay a final payment of 4.0% of the aggregate commitment amounts for Tranche 1, Tranche 2 and Tranche 3, which shall be increased to include the commitment amount of Discretionary Tranche 4 upon the funding of such tranche, on the earlier of (x) the Avenue Maturity Date and (y) the date that the Company prepays all of the outstanding principal amount of the Avenue Loans in full (“Avenue Final Payment”). On the Avenue Closing Date, the Company paid to the Lender a commitment fee of $0.4 million.

The Avenue Loan Agreement contains customary representations, warranties and covenants, including covenants by the Company limiting additional indebtedness, liens, guaranties, mergers and consolidations, substantial asset sales, investments and loans, certain corporate changes, transactions with affiliates and fundamental changes. The Avenue Loan Agreement provides for events of default customary for term loans of this type, including but not limited to non-payment, breaches or defaults in the performance of covenants, insolvency, bankruptcy and the occurrence of a material adverse effect on the Company. After the occurrence of an event of default, the Agent may (i) accelerate payment of all obligations, impose an increased rate of interest, and terminate the Lender’s commitments under the Avenue Loan Agreement and (ii) exercise any other right or remedy provided by contract or applicable law. As of March 31, 2026, the Company was in compliance with all covenants under the Avenue Loan Agreement.

Pursuant to the Avenue Loan Agreement, following the filing of the Company’s annual report on Form 10-K for the fiscal year ending December 31, 2025 which occurred on March 9, 2026, the Lender has the right to convert up to $4.0 million of the outstanding principal of the Avenue Loans (the “Avenue Conversion Option”) at a price of $60.00 per share, subject to certain terms and conditions, including beneficial ownership limitations. In addition, subject to applicable law, the Lender had the right to participate in certain equity financing transactions of the Company in an aggregate amount of up to $1.0 million on the same terms, conditions and pricing offered by the Company to other investors participating in such financing transaction (such right, the “Participation Right”). The Participation Right terminated in April 2026.

At issuance of the Avenue Loans, the Company recorded the debt net of debt discount and costs which included $7.6 million for the grant date fair value of the Avenue Warrant and Avenue Conversion Option (discussed below), Avenue Final Payment of $1.6 million and issuance costs of $1.2 million.

As of March 31, 2026, the carrying value of the Avenue Loans was $6.5 million, consisting of the outstanding principal under Tranche 1 of $15.0 million, plus the Avenue Final Payment of $1.6 million, less unamortized debt discount and costs of $10.1 million, which are being amortized using the effective interest method over the life of the Avenue Loans.

As of March 31, 2026, future payments of principal and interest of the Avenue Loans are as follows (in thousands):


Year ending December 31,
2026 (remaining 9 months)	$	1,404
2027		7,020
2028		6,778
2029		5,207
Total	$	20,409
Less: interest		(3,809	)
Debt, gross	$	16,600
Less: unamortized debt discount and costs		(10,136	)
Less: debt, current portion		(1,000	)
Debt, net of current portion	$	5,464

Avenue Warrant

In connection with the Avenue Loans, the Company issued to the Lender a warrant (the “Avenue Warrant”) to purchase up to $3.2 million worth of shares of the Company’s common stock on March 9, 2026. Prior to the issuance of the Avenue Warrant, the Lender was entitled to receive a payment of $6.4 million in the event a change of control had occurred prior to the issuance of the Avenue Warrant (the “Success Fee”). The obligation to pay the Lender the Success Fee terminated upon the issuance of the Avenue Warrant. The Avenue Warrant will expire on January 31, 2031 (the “Avenue Warrant Expiration Date”) and has an exercise price equal to $50.00 per share, provided that any exercise of such Avenue Warrant is subject to certain beneficial ownership limitations. In addition, upon a change of control, the Lender is entitled to receive the shares of the Company's common stock underlying the Avenue Warrant without payment of the exercise price.

The Lender may exercise the Avenue Warrant at any time, or from time to time up to and including the Avenue Warrant Expiration Date, by making a cash payment equal to the exercise price multiplied by the quantity of shares. The Lender may also exercise the Avenue Warrant on a cashless basis by receiving a net number of shares calculated pursuant to the formula set forth in the Avenue Warrant. The Avenue Warrant is subject to anti-dilution adjustments for stock dividends, stock splits, and reverse stock splits.

Avenue Warrant Liability

Although the Avenue Warrant wasn't legally issued until March 9, 2026 (the “Avenue Warrant Issue Date“), the Avenue Warrant was considered issued and outstanding as of the Avenue Closing Date for accounting purposes. The Avenue Warrant met the criteria for a derivative classification under ASC 815. As of the Avenue Closing Date, the Avenue Warrant did not have a fixed number of shares to be issued and therefore did not qualify for equity classification and was accounted for as a derivative liability at an initial fair value of $3.8 million under the Monte Carlo Method, with changes in fair value recognized on the condensed statements of operations and comprehensive loss during the three months ended March 31, 2026.

Upon legal issuance of the Avenue Warrant on March 9, 2026, the shares into which the Avenue Warrant will be issued became fixed and therefore the Company reassessed its accounting treatment under ASC 815-40-15-7 using the prescribed two-step analysis. The Company concluded that Section 4.3 of the Avenue Warrant, which provides for automatic exchange of the Avenue Warrant for a fixed number of shares without payment of the exercise price upon a change of control, precludes the Avenue Warrant from being considered indexed to the Company’s own stock under Step 2 of ASC 815-40-15-7C through 7E. As such, the Avenue Warrant remains a derivative liability and was remeasured to fair value with changes in fair value recognized on the condensed statements of operations and comprehensive loss during the three months ended March 31, 2026.

Avenue Conversion Option

As discussed above, the Avenue Conversion Option allows the Lender to convert up to $4.0 million of the outstanding principal of the Avenue Loans at a price of $60.00 per share. At inception on the Avenue Closing Date, this feature was initially accounted for as an embedded derivative liability due to variable settlement terms at an initial fair value of $3.7 million under the Monte Carlo Method, with changes in fair value recognized on the condensed statements of operations and comprehensive loss during the three months ended March 31, 2026.

Upon legal issuance of the Avenue Warrant on March 9, 2026, the Company reassessed its accounting treatment under ASC 815-40-15-7 using the prescribed two-step analysis and concluded that the Avenue Conversion Option qualified for equity

classification because the settlement terms became fixed and the Avenue Conversion Option satisfied both the indexation and classification criteria. As such, the derivative liability was remeasured to fair value of $3.7 million and reclassified to additional paid-in capital, with no further remeasurement required thereafter.

The Avenue Warrant and Avenue Conversion Option was measured using the Monte Carlo Method with the following inputs as of the periods noted:


	Avenue Warrant						Avenue Conversion Option
	Grant Date			Quarter End			Grant Date			Issue Date
	1/7/2026			3/31/2026			1/7/2026			3/9/2026
Warrant exercise price / Conversion price max	$	89.21		$	54.60		$	4,000,000		$	4,000,000
Expected term (in years)		5.1			5.1			3.5			3.3
Expected stock price volatility		178.8	%		179.3	%		178.8	%		179.3	%
Risk-free interest rate		3.7	%		3.7	%		3.7	%		3.7	%
Expected dividend rate		0.0	%		0.0	%		0.0	%		0.0	%

The following table provides a roll forward of the aggregate fair value of the Company’s warrant and conversion option liability (in thousands):


	Avenue Warrant		Avenue Conversion Option			Total
Fair value as of December 31, 2025	$	—	$	—		$	—
Grant date fair value		3,819		3,747			7,566
Change in fair value		119		(28	)		91
Reclass to additional paid-in capital		—		(3,719	)		(3,719	)
Fair value as of March 31, 2026	$	3,938	$	—		$	3,938

As of the date of this filing, 64,000 shares remain outstanding under the Avenue Warrant at an exercise price of $50.00 and Avenue had not exercised the Avenue Conversion Option.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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+ Details

Stock-Based Compensation Expense

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation Expense

10. Stock-Based Compensation Expense

The following table summarizes the components of stock-based compensation expense recognized in the Company’s condensed statements of operations and comprehensive loss during the three months ended March 31, 2026 and 2025 (in thousands):


	Three Months Ended March 31,
	2026		2025
Research and development	$	154	$	126
General and administrative		535		418
Total stock-based compensation expense	$	689	$	544

Restricted Stock Units (“RSUs”)

During the three months ended March 31, 2026, the Company granted 62,350 RSUs with a weighted-average grant date fair value of $79.37 per unit, of which 36,900 RSUs are subject to performance-based vesting conditions related to the satisfaction of a regulatory milestone. As of March 31, 2026, the Company had 38,920 RSUs outstanding subject to performance-based vesting conditions, of which none are considered probable of achievement.

Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Balance Sheet Related Disclosures [Abstract]
Accrued research and development expenses	$ 5,301	$ 3,496
Accrued general and administrative expenses	1,834	3,556
Accrued compensation and benefits	640	1,774
Lease liabilities, current portion	326	317
Total accrued expenses and other current liabilities	$ 8,101	$ 9,143

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Rule 10b5-1 Arrangement Modified	false
Non-Rule 10b5-1 Arrangement Modified	false

Stock-Based Compensation Expense - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 689	$ 544
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	154	126
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 535	$ 418

Related Party Transactions - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Related Party Transaction [Line Items]
Accrued compensation expense	$ 0.1
Research and Development
Related Party Transaction [Line Items]
Stock-based compensation expense	$ 0.3	$ 0.3

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Capital Structure

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Capital Structure

9. Capital Structure

Common Stock

As of March 31, 2026 and December 31, 2025, the Company was authorized to issue 200,000,000 shares of common stock $0.0001 par value per share. Holders of common stock are entitled to dividends if and when declared by the board of directors of the Company. The holder of each share of common stock is entitled to one vote. As of March 31, 2026, no dividends were declared.

Common stock reserved for future issuance, on an as converted basis, consisted of the following:


	March 31,		December 31,
	2026		2025
Common stock warrants, issued and outstanding		227,755		169,147
Stock options, issued and outstanding		40,674		42,421
Restricted stock units, issued and outstanding		106,384		47,200
Shares available for future issuance under 2020 Equity Incentive Plan		52,480		19,715
Shares available for future issuance under 2020 Employee Stock Purchase Plan		18,414		12,531
Total shares reserved		445,707		291,014

- Definition

The entire disclosure for equity.

+ References

+ Details

Subsequent Events - Additional Information (Details) - shares	1 Months Ended
	May 31, 2026	May 01, 2026	Mar. 31, 2026	Dec. 31, 2025
Subsequent Event [Line Items]
Shares reserved for issuance			445,707	291,014
Subsequent Event \| 2026 Inducement Plan
Subsequent Event [Line Items]
Shares reserved for issuance		75,000
RSUs granted	7,000
Expiration period	10 years

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2026	May 11, 2026
Cover [Abstract]
Entity Registrant Name	Spruce Biosciences, Inc.
Entity Central Index Key	0001683553
Document Type	10-Q
Document Period End Date	Mar. 31, 2026
Trading Symbol	SPRB
Amendment Flag	false
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		2,752,278
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Small Business	true
Entity File Number	001-39594
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-2154263
Entity Address, Address Line One	611 Gateway Boulevard
Entity Address, Address Line Two	Suite 740
Entity Address, City or Town	South San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94080
City Area Code	415
Local Phone Number	343-5986
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Security Exchange Name	NASDAQ

Subsequent Events

3 Months Ended

Mar. 31, 2026

Subsequent Events [Abstract]

Subsequent Events

13. Subsequent Events

April 2026 Public Offering

See Note 1 “Organization and Principal Activities — April 2026 Public Offering” for further information.

Adoption of 2026 Inducement Plan

In May 2026, the Company's Board of Directors adopted the Spruce Biosciences, Inc. 2026 Inducement Plan (the “Inducement Plan”). The Inducement Plan was adopted without stockholder approval pursuant to Nasdaq Listing Rule 5635(c)(4), which provides an exception to the stockholder approval requirement for the issuance of securities as an inducement material to an individual entering into employment with the Company.

The Company has reserved 75,000 shares of its common stock for issuance pursuant to awards granted under the Inducement Plan. Awards under the Inducement Plan may consist of non-qualified stock options, restricted stock units, restricted stock awards, stock appreciation rights, and other stock-based awards. In accordance with Nasdaq Listing Rule 5635(c)(4), awards under the Inducement Plan may only be made to an employee who has not previously been an employee or director of the Company, or following a bona fide period of non-employment, in each case as a material inducement to the individual's entering into employment with the Company.

In May 2026, the Company granted 7,000 restricted stock units under the Inducement Plan to two newly hired employees, effective as of the day following the filing of a registration statement on Form S-8 covering the shares issuable thereunder. The restricted stock units vest over four years in equal annual installments. The awards have a contractual term of 10 years.

The Company will recognize stock-based compensation expense related to awards granted under the Inducement Plan over the requisite service period in accordance with ASC 718, Compensation — Stock Compensation.

Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2026

Balance Sheet Related Disclosures [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):


	March 31,		December 31,
	2026		2025
Accrued research and development expenses	$	5,301	$	3,496
Accrued general and administrative expenses		1,834		3,556
Accrued compensation and benefits		640		1,774
Lease liabilities, current portion		326		317
Total accrued expenses and other current liabilities	$	8,101	$	9,143

Capital Structure - Summary of Common Stock Reserved for Future Issuance (Details) - shares	Mar. 31, 2026	Dec. 31, 2025
Class Of Stock [Line Items]
Shares reserved for future issuance	445,707	291,014
Shares available for future issuance under 2020 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Shares reserved for future issuance	18,414	12,531
Common Stock warrants, issued and outstanding
Class Of Stock [Line Items]
Shares reserved for future issuance	227,755	169,147
Stock Options, issued and outstanding
Class Of Stock [Line Items]
Shares reserved for future issuance	40,674	42,421
Restricted stock units, issued and outstanding
Class Of Stock [Line Items]
Shares reserved for future issuance	106,384	47,200
Shares available for future issuance under 2020 Equity Incentive Plan
Class Of Stock [Line Items]
Shares reserved for future issuance	52,480	19,715

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

CONDENSED BALANCE SHEETS (Parenthetical) (Unaudited) - $ / shares	Mar. 31, 2026	Dec. 31, 2025
Statement of Financial Position [Abstract]
Preferred Stock, Par Value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	1,372,278	1,372,043
Common stock, shares outstanding	1,372,278	1,372,043

Capital Structure (Tables)

3 Months Ended

Mar. 31, 2026

Equity [Abstract]

Summary of Common Stock Reserved for Future Issuance

Common stock reserved for future issuance, on an as converted basis, consisted of the following:


	March 31,		December 31,
	2026		2025
Common stock warrants, issued and outstanding		227,755		169,147
Stock options, issued and outstanding		40,674		42,421
Restricted stock units, issued and outstanding		106,384		47,200
Shares available for future issuance under 2020 Equity Incentive Plan		52,480		19,715
Shares available for future issuance under 2020 Employee Stock Purchase Plan		18,414		12,531
Total shares reserved		445,707		291,014

Debt (Tables)

3 Months Ended

Mar. 31, 2026

Debt Disclosure [Abstract]

Schedule of Future Principal Payments

As of March 31, 2026, future payments of principal and interest of the Avenue Loans are as follows (in thousands):


Year ending December 31,
2026 (remaining 9 months)	$	1,404
2027		7,020
2028		6,778
2029		5,207
Total	$	20,409
Less: interest		(3,809	)
Debt, gross	$	16,600
Less: unamortized debt discount and costs		(10,136	)
Less: debt, current portion		(1,000	)
Debt, net of current portion	$	5,464

Schedule of Warrants Measured Using Monte Carlo Method

The Avenue Warrant and Avenue Conversion Option was measured using the Monte Carlo Method with the following inputs as of the periods noted:


	Avenue Warrant						Avenue Conversion Option
	Grant Date			Quarter End			Grant Date			Issue Date
	1/7/2026			3/31/2026			1/7/2026			3/9/2026
Warrant exercise price / Conversion price max	$	89.21		$	54.60		$	4,000,000		$	4,000,000
Expected term (in years)		5.1			5.1			3.5			3.3
Expected stock price volatility		178.8	%		179.3	%		178.8	%		179.3	%
Risk-free interest rate		3.7	%		3.7	%		3.7	%		3.7	%
Expected dividend rate		0.0	%		0.0	%		0.0	%		0.0	%

Schedule of Aggregate Fair Value of Warrant and Conversion Option Liability

The following table provides a roll forward of the aggregate fair value of the Company’s warrant and conversion option liability (in thousands):


	Avenue Warrant		Avenue Conversion Option			Total
Fair value as of December 31, 2025	$	—	$	—		$	—
Grant date fair value		3,819		3,747			7,566
Change in fair value		119		(28	)		91
Reclass to additional paid-in capital		—		(3,719	)		(3,719	)
Fair value as of March 31, 2026	$	3,938	$	—		$	3,938

Commitments and Contingencies

3 Months Ended

Mar. 31, 2026

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

8. Commitments and Contingencies

The Company’s industry is characterized by frequent claims and litigation, including claims regarding intellectual property. As a result, the Company may be subject to various legal proceedings from time to time. The results of any future litigation cannot be predicted with certainty, and regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors. As of March 31, 2026, the Company was not subject to any material legal proceedings and management is not aware of any pending or threatened litigation that, individually or in the aggregate, could have a material adverse effect on the Company's business, financial condition or results of operations.

Debt - Schedule of Aggregate Fair Value of Warrant and Conversion Option Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Debt Instrument [Line Items]
Fair value as of December 31, 2025	$ 0
Grant date fair value	7,566
Change in fair value	91	$ (158)
Reclass to additional paid-in capital	(3,719)
Fair value as of March 31, 2026	3,938
Avenue Warrant
Debt Instrument [Line Items]
Fair value as of December 31, 2025	0
Grant date fair value	3,819
Change in fair value	119
Reclass to additional paid-in capital	0
Fair value as of March 31, 2026	3,938
Avenue Conversion Option
Debt Instrument [Line Items]
Fair value as of December 31, 2025	0
Grant date fair value	3,747
Change in fair value	(28)
Reclass to additional paid-in capital	(3,719)
Fair value as of March 31, 2026	$ 0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (b)
-Publisher FASB
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Stock-Based Compensation Expense - Additional Information (Details) - RSU	3 Months Ended
	Mar. 31, 2026 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs granted	62,350
Weighted Average Grant Date Fair Value Per Share, Granted \| $ / shares	$ 79.37
Number of shares vested	36,900
Share Based Compensation Award Tranche Four
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs outstanding	38,920
Probable of Achievement
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs granted	0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Fair Value Measurements - Additional Information (Details) $ in Thousands	Dec. 31, 2025 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities fair value	$ 0

Debt - Schedule of Warrants Measured Using Monte Carlo Method (Details)	Mar. 31, 2026 shares	Mar. 09, 2026 shares	Jan. 07, 2026 shares
Avenue Warrant \| Warrant exercise price / Conversion price max
Debt Instrument [Line Items]
Warrants	54.6		89.21
Avenue Warrant \| Expected term (in years)
Debt Instrument [Line Items]
Warrants, Term	5 years 1 month 6 days		5 years 1 month 6 days
Avenue Warrant \| Expected stock price volatility
Debt Instrument [Line Items]
Warrants	1.793		1.788
Avenue Warrant \| Risk-free interest rate
Debt Instrument [Line Items]
Warrants	0.037		0.037
Avenue Warrant \| Expected dividend rate
Debt Instrument [Line Items]
Warrants	0		0
Avenue Conversion Option \| Warrant exercise price / Conversion price max
Debt Instrument [Line Items]
Warrants		4,000,000	4,000,000
Avenue Conversion Option \| Expected term (in years)
Debt Instrument [Line Items]
Warrants, Term		3 years 3 months 18 days	3 years 6 months
Avenue Conversion Option \| Expected stock price volatility
Debt Instrument [Line Items]
Warrants		1.793	1.788
Avenue Conversion Option \| Risk-free interest rate
Debt Instrument [Line Items]
Warrants		0.037	0.037
Avenue Conversion Option \| Expected dividend rate
Debt Instrument [Line Items]
Warrants		0	0

Leases - Additional Information (Details) - South San Francisco, California - ft²	1 Months Ended	3 Months Ended
	Dec. 31, 2022	Mar. 31, 2026
Lessee, Lease, Description [Line Items]
Area of office space	6,500
Operating lease commencement date	2022-12
Operating lease termination date	2028-02
Operating Leases, option to renew lease term description		The Company has an option to extend the lease term of the South San Francisco Lease for an additional three years which has not been included in the lease term as it is not reasonably certain that the Company will exercise this option.
Operating leases, renew lease term	3 years

Stock-Based Compensation Expense (Tables)

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Summary of Stock-Based Compensation Expense


	Three Months Ended March 31,
	2026		2025
Research and development	$	154	$	126
General and administrative		535		418
Total stock-based compensation expense	$	689	$	544

CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities
Net loss	$ (12,266)	$ (14,041)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	689	544
Depreciation and amortization	252	6
Non-cash lease expense	71	65
Change in fair value of warrant and conversion option liabilities	91	(158)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	2,054	492
Other assets	64	0
Accounts payable	1,700	584
Accrued expenses and other current liabilities	(1,300)	140
Other liabilities	(87)	(359)
Net cash used in operating activities	(8,732)	(12,727)
Cash flows from investing activities
Purchases of property and equipment	(10)	0
Net cash used in investing activities	(10)	0
Cash flows from financing activities
Proceeds from debt, gross	14,146	0
Repayment of debt	0	(405)
Payment of debt and equity offering costs	(220)	(6)
Tax withholding payments on restricted stock units	(10)	0
Net cash provided by (used in) financing activities	13,916	(411)
Net increase (decrease) in cash, cash equivalents, and restricted cash	5,174	(13,138)
Cash, cash equivalents, and restricted cash at beginning of period	48,942	38,788
Cash, cash equivalents, and restricted cash at end of period	54,116	25,650
Reconciliation of cash, cash equivalents, and restricted cash
Cash and cash equivalents	54,080	25,615
Restricted cash, long-term (included in other assets)	36	35
Total cash, cash equivalents and restricted cash	54,116	25,650
Supplemental cash flow data:
Cash paid for interest on term loan	158	30
Supplemental disclosure of non-cash investing and financing activities:
Allocation of debt to warrant liability for warrant and embedded conversion option	7,566	0
Reclassification of debt embedded conversion option to additional paid-in capital	3,719	0
Deferred offering costs included in accounts payable and accrued expenses	$ 298	$ 0

CONDENSED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 54,080	$ 48,906
Prepaid expenses	864	353
Other current assets	88	2,853
Total current assets	55,032	52,112
Right-of-use assets	595	666
Other assets	539	243
Total assets	56,166	53,021
Current liabilities:
Accounts payable	2,683	943
Accrued expenses and other current liabilities	8,101	9,143
Debt, current portion	1,000	0
Total current liabilities	11,784	10,086
Lease liabilities, net of current portion	332	419
Debt, net of current portion	5,464	0
Warrant liability	3,938	0
Total liabilities	21,518	10,505
Commitments and contingencies (Note 8)
Stockholders’ equity:
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued or outstanding as of March 31, 2026 and December 31, 2025	0	0
Common stock, $0.0001 par value; 200,000,000 shares authorized as of March 31, 2026 and December 31, 2025; 1,372,278 and 1,372,043 shares issued and outstanding as of March 31, 2026 and December 31, 2025, respectively	0	0
Additional paid-in capital	336,148	331,750
Accumulated deficit	(301,500)	(289,234)
Total stockholders' equity	34,648	42,516
Total liabilities and stockholders’ equity	$ 56,166	$ 53,021

CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Operating expenses:
Research and development	$ 7,575	$ 10,837
General and administrative	4,412	3,655
Total operating expenses	11,987	14,492
Loss from operations	(11,987)	(14,492)
Interest expense	(674)	(36)
Interest and other income, net	486	329
Change in fair value of warrant and conversion option liabilities	(91)	158
Net loss and comprehensive loss	$ (12,266)	$ (14,041)
Net loss per share, basic	$ (8.94)	$ (23.95)
Net loss per share, diluted	$ (8.94)	$ (23.95)
Weighted-average shares of common stock outstanding, basic	1,372,084	586,142
Weighted-average shares of common stock outstanding, diluted	1,372,084	586,142

Fair Value Measurements

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Fair Value Measurements

3. Fair Value Measurements

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability, or an exit price, in the principal or most advantageous market for that asset or liability in an orderly transaction between market participants on the measurement date. Fair value measurement establishes a fair value hierarchy that requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value.

The Company determined the fair value of financial assets and liabilities using the fair value hierarchy that describes three levels of inputs that may be used to measure fair value, as follows:

Level 1 — Quoted prices in active markets for identical assets and liabilities;

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

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

Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company classifies money market funds as Level 1 instruments as the Company uses quoted prices in active markets for identical assets to determine the fair value.

The following table summarizes the Company's financial assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):


	March 31, 2026
	Total		Level 1		Level 2		Level 3
Financial assets:
Cash equivalents:
Money market funds	$	45,618	$	45,618	$	—	$	—
Total	$	45,618	$	45,618	$	—	$	—
Financial liabilities:
Warrant liability	$	3,938	$	—	$	—	$	3,938
Total	$	3,938	$	—	$	—	$	3,938


	December 31, 2025
	Total		Level 1		Level 2		Level 3
Financial assets:
Cash equivalents:
Money market funds	$	48,458	$	48,458	$	—	$	—
Total	$	48,458	$	48,458	$	—	$	—

The Company did not have any financial liabilities recorded at fair value as of December 31, 2025.

Debt

The gross amount of debt approximates its fair value as of March 31, 2026 as the debt bears interest at a variable rate that includes a component based on the prime rate, which is a market-observable rate. As a result, the stated coupon rate is consistent with current market rates for similar instruments and therefore the carrying amount is considered to approximate fair value.

Warrant and Conversion Option Liabilities

The Company classified its warrant and conversion option liabilities as Level 3 instruments as they were valued using the Monte Carlo Method. See Note 6 “Debt” for further information.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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+ Details

Organization and Principal Activities - Additional Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Apr. 22, 2026 USD ($) d $ / shares shares	Mar. 31, 2026 USD ($) shares	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)	Nov. 30, 2025 USD ($)
Organization And Principal Activities [Line Items]
Cash, cash equivalents, and short-term investments		$ 54,100
Net Income (Loss)		(12,266)	$ (14,041)
Cash in operations		8,700
Accumulated deficit		$ (301,500)		$ (289,234)
Open Market Sales Agreement
Organization And Principal Activities [Line Items]
Covering sale up to					$ 300,000
Aggregate offering price of up to					$ 75,000
Common stock issued \| shares		0
Reverse Stock Split
Organization And Principal Activities [Line Items]
Reverse stock split , shares \| shares		75
Pre Funded Warrants \| April 2026 Public Offering \| Subsequent Event
Organization And Principal Activities [Line Items]
Public offering price per share of common stock \| $ / shares	$ 49.99
Common stock at a public offering price \| shares	50,000
Offering expenses payable	$ 69,000
Common Stock \| April 2026 Public Offering \| Subsequent Event
Organization And Principal Activities [Line Items]
Common stock at a public offering price \| $ / shares	$ 50
Underwritten public offering share \| shares	1,150,000
Warrants exercise price \| $ / shares	$ 0.01
Additional shares of common stock at the public offering price \| shares	180,000
Number of Trading option to purchase \| d	30

CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Balance at Dec. 31, 2024	$ 28,821	$ 0	$ 279,089	$ (250,268)
Balance, Shares at Dec. 31, 2024		563,042
Stock-based compensation	544		544
Net loss	(14,041)			(14,041)
Balance at Mar. 31, 2025	15,324	$ 0	279,633	(264,309)
Balance, Shares at Mar. 31, 2025		563,042
Balance at Dec. 31, 2025	$ 42,516	$ 0	331,750	(289,234)
Balance, Shares at Dec. 31, 2025	1,372,043	1,372,043
Issuance of common stock related to vesting of restricted stock units, net of tax withholdings	$ (10)		(10)
Issuance of common stock related to vesting of restricted stock units, net of tax withholdings, shares		235
Reclassification of embedded conversion option	3,719		3,719
Stock-based compensation	689		689
Net loss	(12,266)			(12,266)
Balance at Mar. 31, 2026	$ 34,648	$ 0	$ 336,148	$ (301,500)
Balance, Shares at Mar. 31, 2026	1,372,278	1,372,278

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

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+ Details

Summary of Significant Accounting Policies (Policies)	3 Months Ended
Summary of Significant Accounting Policies (Policies)	Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the SEC for interim reporting. As permitted under those rules and regulations, certain notes or other financial information normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The condensed balance sheet as of March 31, 2026, the condensed statements of operations and comprehensive loss for the three months ended March 31, 2026 and 2025, the condensed statement of stockholders’ equity for the three months ended March 31, 2026 and 2025, and the condensed statements of cash flows for the three months ended March 31, 2026 and 2025 are unaudited. The interim condensed financial statements have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal, recurring adjustments that are necessary to present fairly the Company’s results for the interim periods presented. The condensed balance sheet as of December 31, 2025 is derived from the Company’s audited financial statements. The results of operations for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for the year ending December 31, 2026, or for any other future annual or interim period. These interim condensed financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 filed with the SEC on March 9, 2026 (“Annual Report”). Certain prior period amounts on the condensed statement of operations and comprehensive loss for the three months ended March 31, 2025 have been reclassified to conform to the current period presentation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and expenses as well as related disclosure of contingent assets and liabilities. Significant estimates and assumptions reflected in these financial statements include, but are not limited to, accrued research and development expenses, warrant liability, stock-based compensation, and uncertain tax positions. The Company bases its estimates on its historical experience and on assumptions that it believes are reasonable; however, actual results could significantly differ from those estimates.
Risks and Uncertainties	Risks and Uncertainties Any product candidates developed by the Company will require approvals from the U.S. Food and Drug Administration or foreign regulatory agencies prior to commercial sales. There can be no assurance that the Company’s current and future product candidates will meet desired efficacy and safety requirements to obtain the necessary approvals. If approval is denied or delayed, it may have a material adverse impact on the Company’s business and its financial statements. The Company is subject to a number of risks similar to other late-stage biopharmaceutical companies including, but not limited to, dependency on the clinical success of the Company’s product candidates, ability to obtain regulatory approval of its product candidates, the need for substantial additional financing to achieve its goals, uncertainty of broad adoption of its approved products, if any, by physicians and consumers, significant competition, untested manufacturing capabilities, and dependence on key individuals and sole source suppliers. Global economic and business activities continue to face widespread macroeconomic and geopolitical uncertainties, including global trade disputes, labor shortages, declines in consumer confidence, inflation and monetary supply shifts, recession risks, potential disruptions from the ongoing wars in Ukraine and the Middle East and related sanctions, declines in economic growth, tariffs and related legal challenges, the recent U.S. government shutdown and uncertainty about economic stability. The Company continues to actively monitor the impact of these macroeconomic and geopolitical factors on its financial condition, liquidity, operations, and workforce. The extent of the impact of these factors on the Company’s operational and financial performance, including its ability to execute its business strategies and initiatives in the expected time frame, will depend on future developments, which are uncertain and cannot be predicted; however, any continued or renewed disruption resulting from these factors could negatively impact the Company’s business.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments, which potentially subject the Company to significant concentration of credit risk, consist primarily of cash and cash equivalents. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company is exposed to credit risk in the event of default by the financial institutions holding its cash and cash equivalents to the extent recorded in the condensed balance sheets.
Segment Reporting	Segment Reporting The Company operates and manages its business as one reportable and operating segment, which is the business of developing and commercializing novel therapies for serious neurological disorders with significant unmet medical need. The Company’s chief executive officer, who is the chief operating decision maker (“CODM”), reviews financial information on an aggregate basis for allocating and evaluating financial performance. All long-lived assets are maintained in the United States of America. The CODM assesses performance and decides how to allocate resources based on net loss. Net loss is used to monitor budget versus actual results. The measure of segment net loss and segment expenses is reported on the condensed statements of operations and comprehensive loss. The measure of segment assets is reported on the condensed balance sheet as total assets.
Significant Accounting Policies	Significant Accounting Policies There have been no significant changes to the significant accounting policies during the three months ended March 31, 2026, as compared to the significant accounting policies described in the Annual Report.
Recent Accounting Pronouncements - Not Yet Adopted	Recent Accounting Pronouncements - Not Yet Adopted In November 2024, the FASB issued Accounting Standards Update 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which requires disaggregated information about certain income statement expense line items on an annual and interim basis. ASU 2024-03 is effective for annual periods beginning after December 15, 2026 and interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted and can be applied prospectively or retrospectively. The Company is evaluating the impact of the adoption of this standard on the Company’s financial statements and related disclosures.

- Definition

Disclosure of accounting policy for segment reporting.

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- Definition

Disclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.

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+ Details

Net Loss Per Share - Schedule of Potentially Dilutive Securities not Included in Calculation of Diluted Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities excluded from diluted net loss per share	380,731	246,642
Shares subject to outstanding common stock warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities excluded from diluted net loss per share	227,755	169,154
Shares subject to outstanding common stock options
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities excluded from diluted net loss per share	40,674	43,776
Shares subject to outstanding RSUs
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities excluded from diluted net loss per share	106,384	30,393
Estimated shares issuable under the 2020 Employee Stock Purchase Plan
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential dilutive securities excluded from diluted net loss per share	5,918	3,319

Leases

3 Months Ended

Mar. 31, 2026

Leases [Abstract]

Leases

5. Leases

The Company leases space under a non-cancelable operating lease, which requires the Company to pay base rent, real estate taxes, insurance, general repairs, and maintenance. In December 2022, the Company entered into a non-cancelable operating lease for approximately 6,500 square feet of office space in South San Francisco, California, which commenced in December 2022 and expires in February 2028 (the “South San Francisco Lease”). The Company has an option to extend the lease term of the South San Francisco Lease for an additional three years which has not been included in the lease term as it is not reasonably certain that the Company will exercise this option.

Debt - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Mar. 09, 2026	Jan. 07, 2026	Mar. 31, 2026	Jul. 01, 2026	May 13, 2026	Mar. 01, 2026
Debt Instrument [Line Items]
Long term debt, maturities, repayment terms		The Company will make interest only payments on the Avenue Loans until the 12-month anniversary of the Avenue Closing Date, subject to (i) a 6-month extension, so long as at least $5.0 million from Tranche 2 has been funded and (ii) an additional 12-month extension if the Company achieves the Tranche 3 milestone.
Commitment fee		$ 400
Outstanding principal of the loans		$ 4,000
Debt conversion description		Pursuant to the Avenue Loan Agreement, following the filing of the Company’s annual report on Form 10-K for the fiscal year ending December 31, 2025 which occurred on March 9, 2026, the Lender has the right to convert up to $4.0 million of the outstanding principal of the Avenue Loans (the “Avenue Conversion Option”) at a price of $60.00 per share, subject to certain terms and conditions, including beneficial ownership limitations.
Debt conversion price		$ 60
End of term payment, amount		$ 1,600
Debt issuance costs		1,200
Carrying value of the Term Loan			$ 16,600
Financing transactions aggregate amount		1,000
Warrant
Debt Instrument [Line Items]
Carrying value of the Term Loan		7,600
Avenue Warrant
Debt Instrument [Line Items]
Derivative Liabilities	$ 3,800
Standard Warrants
Debt Instrument [Line Items]
Expiration Date	Jan. 31, 2031
Warrants exercise price	$ 50
Value of common stock	$ 3,200
Lender success fee	$ 6,400
Subsequent Event \| Avenue Warrant
Debt Instrument [Line Items]
Warrants exercised					50
Warrants outstanding, Shares					64,000
Avenue Loan
Debt Instrument [Line Items]
Outstanding principal of the loans		$ 4,000
Debt conversion price	$ 60
End of term payment, amount			1,600
Carrying value of the Term Loan			6,500
Unamortized debt discount and issuance costs			10,100
Embedded Derivative Liability, Fair Value			3,700
Tranche 1
Debt Instrument [Line Items]
Aggregate principal amount			$ 15,000
Prior to the first anniversary
Debt Instrument [Line Items]
Interest rate of term loan		3.00%
After the first anniversary
Debt Instrument [Line Items]
Interest rate of term loan				2.00%
Prior to the second anniversary
Debt Instrument [Line Items]
Interest rate of term loan				1.00%
After the second anniversary
Debt Instrument [Line Items]
Interest rate of term loan				4.00%
Avenue Conversion Option \| Subsequent Event
Debt Instrument [Line Items]
Warrants exercised					0
Avenue Loan Agreement Under Prime Rate
Debt Instrument [Line Items]
Interest rate of term loan		5.25%
Avenue Loan Agreement
Debt Instrument [Line Items]
Expiration Date		Jul. 01, 2029
Interest rate of term loan		12.25%
Debt instrument, term		12 months
Avenue Loan Agreement \| Avenue Loan
Debt Instrument [Line Items]
Interest rate of term loan			12.25%
Embedded Derivative Liability, Fair Value			$ 3,700
Avenue Loan Agreement \| Tranche 1
Debt Instrument [Line Items]
Aggregate principal amount		$ 15,000
Avenue Loan Agreement \| Maximum
Debt Instrument [Line Items]
Aggregate principal amount		50,000
Avenue Loan Agreement \| Maximum \| Tranche 2
Debt Instrument [Line Items]
Aggregate principal amount						$ 10,000
Avenue Loan Agreement \| Maximum \| Tranche 3
Debt Instrument [Line Items]
Aggregate principal amount		15,000
Avenue Loan Agreement \| Maximum \| Discretionary Tranche 4
Debt Instrument [Line Items]
Additional term loans		$ 10,000
Avenue Loan Agreement \| Minimum \| Tranche 2
Debt Instrument [Line Items]
Aggregate principal amount				$ 5,000

Net Loss Per Share (Tables)

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Net Loss Per Share

The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except share and per share amounts):


	Three Months Ended March 31,
	2026			2025
Numerator:
Net loss	$	(12,266	)	$	(14,041	)
Denominator:
Weighted-average shares of common stock outstanding		1,372,084			586,142
Net loss per share, basic and diluted	$	(8.94	)	$	(23.95	)

Schedule of Potentially Dilutive Securities not Included in Calculation of Diluted Per Share

Basic net loss per share was the same as diluted net loss per share for all periods as the inclusion of potentially dilutive securities would have been anti-dilutive. Potentially dilutive securities that were not included in the diluted per share calculations were as follows:


	March 31,
	2026		2025
Shares subject to outstanding common stock warrants		227,755		169,154
Shares subject to outstanding common stock options		40,674		43,776
Shares subject to outstanding RSUs		106,384		30,393
Estimated shares issuable under the 2020 Employee Stock Purchase Plan		5,918		3,319
Total		380,731		246,642

Net Loss Per Share

3 Months Ended

Mar. 31, 2026

Earnings Per Share [Abstract]

Net Loss Per Share

11. Net Loss Per Share

The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except share and per share amounts):


	Three Months Ended March 31,
	2026			2025
Numerator:
Net loss	$	(12,266	)	$	(14,041	)
Denominator:
Weighted-average shares of common stock outstanding		1,372,084			586,142
Net loss per share, basic and diluted	$	(8.94	)	$	(23.95	)


	March 31,
	2026		2025
Shares subject to outstanding common stock warrants		227,755		169,154
Shares subject to outstanding common stock options		40,674		43,776
Shares subject to outstanding RSUs		106,384		30,393
Estimated shares issuable under the 2020 Employee Stock Purchase Plan		5,918		3,319
Total		380,731		246,642

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2026

Fair Value Disclosures [Abstract]

Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table summarizes the Company's financial assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):


	March 31, 2026
	Total		Level 1		Level 2		Level 3
Financial assets:
Cash equivalents:
Money market funds	$	45,618	$	45,618	$	—	$	—
Total	$	45,618	$	45,618	$	—	$	—
Financial liabilities:
Warrant liability	$	3,938	$	—	$	—	$	3,938
Total	$	3,938	$	—	$	—	$	3,938


	December 31, 2025
	Total		Level 1		Level 2		Level 3
Financial assets:
Cash equivalents:
Money market funds	$	48,458	$	48,458	$	—	$	—
Total	$	48,458	$	48,458	$	—	$	—

License Agreements - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended
	Jan. 31, 2025	Feb. 28, 2025	Nov. 30, 2024	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Research and development				$ 7,575	$ 10,837
Accrued expenses and other current liabilities				8,101		$ 9,143
Allievex Purchase Agreement
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Consideration paid			$ 5,000
Consideration assumed as certain liabilities				7,800
Estimated receivable				2,600
Sales milestones				100,000
Allievex Purchase Agreement \| Maximum \| MPSIIIB
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Development and regulatory milestones				25,500
HBM Alpha Therapeutics, Inc
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Upfront payments		$ 5,000
Development and regulatory milestones				390,000
Payments to acquire in process research and development				5,000
Fair value of pre-funded warrants issued				700
Percentage of issued pre-funded warrants	4.99%
Pre-funded warrants, expiration period	Dec. 31, 2025
BioMarin [Member]
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Obligations to pay third party				$ 0

Organization and Principal Activities

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Principal Activities

1. Organization and Principal Activities

Description of Business

Spruce Biosciences, Inc. (the “Company”) is a late-stage biopharmaceutical company focused on developing and commercializing novel therapies for neurological disorders with significant unmet medical need. The Company is located in South San Francisco, California and was incorporated in the state of Delaware in April 2016.

April 2026 Public Offering

On April 22, 2026, the Company closed its previously announced underwritten public offering of 1,150,000 shares of its common stock at a public offering price of $50.00 per share and pre-funded warrants to purchase up to 50,000 shares of its common stock at a public offering price of $49.99 per pre-funded warrant (which equals the public offering price per share of common stock, less the $0.01 per share exercise price of each pre-funded warrant). In addition, the Company granted the underwriters a 30-day option to purchase up to 180,000 additional shares of common stock at the public offering price, less underwriting discounts and commissions, which was exercised in full. The gross proceeds to the Company from the offering, before deducting underwriting discounts and commissions and estimated offering expenses payable by the Company, were approximately $69.0 million. The pre-funded warrants were fully exercised in April 2026.

Open Market Sales Agreement

In November 2025, the U.S. Securities and Exchange Commission (“SEC”) declared effective a registration statement on Form S-3 (the “Shelf Registration”), covering the sale of up to $300.0 million of the Company's securities. Also, in March 2026, the Company entered into an Open Market Sales AgreementSM (the “Sales Agreement”) with Jefferies LLC (“Jefferies”) pursuant to which it may elect to issue and sell, from time to time, shares of common stock having an aggregate offering price of up to $75.0 million under the Shelf Registration through Jefferies acting as the sales agent and/or principal. As of March 31, 2026, the Company has not issued any shares of common stock under the Sales Agreement.

Reverse Stock Split

Effective April 29, 2025, the Company’s common stock was delisted from the Nasdaq Capital Market as a result of the Company’s ongoing failure to comply with the minimum bid price requirement under the Nasdaq Capital Market. As a result, the Company’s common stock began trading publicly on the over-the-counter market on April 29, 2025 under its symbol “SPRB”.

Subsequently on August 4, 2025, the Company effected a one-for-seventy-five (1:75) reverse stock split of its outstanding common stock (the “Reverse Stock Split”). The Company's common stock began trading on the OTCQB on a split-adjusted basis on August 7, 2025 (the “Split Effective Date”) under the ticker symbol “SPRBD”. The Company’s common stock resumed trading on the Nasdaq Capital Market on September 15, 2025 under the ticker symbol “SPRB”.

At the Split Effective Date, every 75 shares of the Company’s issued and outstanding common stock were automatically converted into one issued and outstanding share of common stock, without any change in authorized common stock or par value per share. The Reverse Stock Split affected all shares of the Company’s common stock outstanding immediately prior to the effective time of the Reverse Stock Split, as well as the number of shares of common stock available for issuance under the Company’s equity incentive plans and employee stock purchase plan. In addition, the Reverse Stock Split effected a reduction in the number of shares of common stock issuable upon the exercise of warrants, stock options and restricted stock units outstanding immediately prior to the effectiveness of the Reverse Stock Split with a corresponding increase in the exercise price per share applicable to such warrants and stock options. No fractional shares were issued because of the Reverse Stock Split. Stockholders who were otherwise entitled to receive a fractional share received a cash payment in lieu thereof.

All of the outstanding common stock share numbers (including shares of common stock subject to the Company’s options), share prices, exercise prices and per share amounts contained in the financial statements have been retroactively adjusted in the financial statements to reflect this Reverse Stock Split for all periods presented.

Liquidity and Capital Resources

The Company has incurred significant losses and negative cash flows from operations. During the three months ended March 31, 2026, the Company incurred a net loss of $12.3 million and used $8.7 million of cash in operations. As of March 31, 2026, the Company had an accumulated deficit of $301.5 million and does not expect positive cash flows from operations in the foreseeable future. The Company has funded its operations primarily through the issuance and sale of equity securities, debt and collaboration revenue.

The accompanying financial statements have been prepared assuming the Company will continue as a going concern, which assumes the realization of assets and satisfaction of liabilities and commitments in the normal course of business. The Company believes that based on its current operating plan, its cash and cash equivalents of $54.1 million as of March 31, 2026 and the net proceeds from its April 2026 underwritten public offering of common stock and pre-funded warrants will be sufficient to fund its planned operations and debt obligations for at least 12 months following the issuance date of these financial statements.

Debt - Schedule of Future Principal Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Disclosure [Abstract]
2026 (remaining 9 months)	$ 1,404
2027	7,020
2028	6,778
2029	5,207
Total	20,409
Less: interest	(3,809)
Debt, gross	16,600
Less: unamortized debt issuance costs	(10,136)
Less: debt, current portion	(1,000)	$ 0
Debt, net of current portion	$ 5,464	$ 0

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Liabilities, Fair Value Disclosure, Total		$ 0
Fair Value Recurring
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Total	$ 45,618	48,458
Liabilities, Fair Value Disclosure, Total	3,938
Fair Value Recurring \| Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalents, fair value	45,618	48,458
Fair Value Recurring \| Warrant liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Financial Liabilities Fair Value Disclosure, Total	3,938
Fair Value Recurring \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Total	45,618	48,458
Liabilities, Fair Value Disclosure, Total	0
Fair Value Recurring \| Level 1 \| Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalents, fair value	45,618	48,458
Fair Value Recurring \| Level 1 \| Warrant liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Financial Liabilities Fair Value Disclosure, Total	0
Fair Value Recurring \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Total	0	0
Liabilities, Fair Value Disclosure, Total	0
Fair Value Recurring \| Level 2 \| Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalents, fair value	0	0
Fair Value Recurring \| Level 2 \| Warrant liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Financial Liabilities Fair Value Disclosure, Total	0
Fair Value Recurring \| Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure, Total	0	0
Liabilities, Fair Value Disclosure, Total	3,938
Fair Value Recurring \| Level 3 \| Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash and cash equivalents, fair value	0	$ 0
Fair Value Recurring \| Level 3 \| Warrant liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Financial Liabilities Fair Value Disclosure, Total	$ 3,938

Balance Sheet Components

3 Months Ended

Mar. 31, 2026

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

4. Balance Sheet Components

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):


	March 31,		December 31,
	2026		2025
Accrued research and development expenses	$	5,301	$	3,496
Accrued general and administrative expenses		1,834		3,556
Accrued compensation and benefits		640		1,774
Lease liabilities, current portion		326		317
Total accrued expenses and other current liabilities	$	8,101	$	9,143

Accrued research and development expenses were primarily related to clinical development.

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025
Pay vs Performance Disclosure
Net Income (Loss)	$ (12,266)	$ (14,041)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

+ Details

Summary of Significant Accounting Policies	3 Months Ended
Summary of Significant Accounting Policies	Mar. 31, 2026
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and applicable rules and regulations of the SEC for interim reporting. As permitted under those rules and regulations, certain notes or other financial information normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted. The condensed balance sheet as of March 31, 2026, the condensed statements of operations and comprehensive loss for the three months ended March 31, 2026 and 2025, the condensed statement of stockholders’ equity for the three months ended March 31, 2026 and 2025, and the condensed statements of cash flows for the three months ended March 31, 2026 and 2025 are unaudited. The interim condensed financial statements have been prepared on the same basis as the annual financial statements and, in the opinion of management, reflect all adjustments, which include only normal, recurring adjustments that are necessary to present fairly the Company’s results for the interim periods presented. The condensed balance sheet as of December 31, 2025 is derived from the Company’s audited financial statements. The results of operations for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for the year ending December 31, 2026, or for any other future annual or interim period. These interim condensed financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 filed with the SEC on March 9, 2026 (“Annual Report”). Certain prior period amounts on the condensed statement of operations and comprehensive loss for the three months ended March 31, 2025 have been reclassified to conform to the current period presentation. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and expenses as well as related disclosure of contingent assets and liabilities. Significant estimates and assumptions reflected in these financial statements include, but are not limited to, accrued research and development expenses, warrant liability, stock-based compensation, and uncertain tax positions. The Company bases its estimates on its historical experience and on assumptions that it believes are reasonable; however, actual results could significantly differ from those estimates. Risks and Uncertainties Any product candidates developed by the Company will require approvals from the U.S. Food and Drug Administration or foreign regulatory agencies prior to commercial sales. There can be no assurance that the Company’s current and future product candidates will meet desired efficacy and safety requirements to obtain the necessary approvals. If approval is denied or delayed, it may have a material adverse impact on the Company’s business and its financial statements. The Company is subject to a number of risks similar to other late-stage biopharmaceutical companies including, but not limited to, dependency on the clinical success of the Company’s product candidates, ability to obtain regulatory approval of its product candidates, the need for substantial additional financing to achieve its goals, uncertainty of broad adoption of its approved products, if any, by physicians and consumers, significant competition, untested manufacturing capabilities, and dependence on key individuals and sole source suppliers. Global economic and business activities continue to face widespread macroeconomic and geopolitical uncertainties, including global trade disputes, labor shortages, declines in consumer confidence, inflation and monetary supply shifts, recession risks, potential disruptions from the ongoing wars in Ukraine and the Middle East and related sanctions, declines in economic growth, tariffs and related legal challenges, the recent U.S. government shutdown and uncertainty about economic stability. The Company continues to actively monitor the impact of these macroeconomic and geopolitical factors on its financial condition, liquidity, operations, and workforce. The extent of the impact of these factors on the Company’s operational and financial performance, including its ability to execute its business strategies and initiatives in the expected time frame, will depend on future developments, which are uncertain and cannot be predicted; however, any continued or renewed disruption resulting from these factors could negatively impact the Company’s business. Concentration of Credit Risk Financial instruments, which potentially subject the Company to significant concentration of credit risk, consist primarily of cash and cash equivalents. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company is exposed to credit risk in the event of default by the financial institutions holding its cash and cash equivalents to the extent recorded in the condensed balance sheets. Segment Reporting The Company operates and manages its business as one reportable and operating segment, which is the business of developing and commercializing novel therapies for serious neurological disorders with significant unmet medical need. The Company’s chief executive officer, who is the chief operating decision maker (“CODM”), reviews financial information on an aggregate basis for allocating and evaluating financial performance. All long-lived assets are maintained in the United States of America. The CODM assesses performance and decides how to allocate resources based on net loss. Net loss is used to monitor budget versus actual results. The measure of segment net loss and segment expenses is reported on the condensed statements of operations and comprehensive loss. The measure of segment assets is reported on the condensed balance sheet as total assets. Significant Accounting Policies There have been no significant changes to the significant accounting policies during the three months ended March 31, 2026, as compared to the significant accounting policies described in the Annual Report. Recent Accounting Pronouncements - Not Yet Adopted In November 2024, the FASB issued Accounting Standards Update 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which requires disaggregated information about certain income statement expense line items on an annual and interim basis. ASU 2024-03 is effective for annual periods beginning after December 15, 2026 and interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted and can be applied prospectively or retrospectively. The Company is evaluating the impact of the adoption of this standard on the Company’s financial statements and related disclosures.

Related Party Transactions

3 Months Ended

Mar. 31, 2026

Related Party Transactions

12. Related Party Transactions

Effective December 20, 2024, Kirk Ways, M.D., a member of the board of the directors, began serving as the Company’s interim Chief Medical Officer pursuant to a consulting agreement. During the three months ended March 31, 2026 and 2025, the Company recognized compensation expense of $0.3 million and $0.3 million, respectively, which is included in research and development expenses on the condensed statement of operations and comprehensive loss. As of March 31, 2026, the Company accrued compensation expense of $0.1 million which is included in accrued expenses and other current liabilities on the condensed balance sheet.

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-URI https://asc.fasb.org/1943274/2147480990/946-20-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Name Accounting Standards Codification
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-Subparagraph (SX 210.6-07(2)(g)(3))
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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-Paragraph 1
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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-Subparagraph (a)
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

+ Details