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Long-term debt | 12 Months Ended
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Mar. 31, 2026
Debt Disclosure [Abstract] |
Long-term debt | Long-term debt Hercules Loan Agreement On October 6, 2022, the Company entered into a Loan and Security Agreement (the “Loan Agreement”), with Hercules Capital, Inc., as administrative agent, collateral agent and as a lender (“Hercules”). Pursuant to the Loan Agreement, the Company can borrow term loans in an aggregate maximum principal amount of up to $200.0 million under multiple tranches (the “Term Loan Facility”). Under the Loan Agreement, the Company borrowed an initial amount of $30.0 million on the closing date, and at the Company's sole option, could have drawn, but did not draw down, an additional $30.0 million on or prior to September 30, 2023. The Company can also draw as additional term loan advances in an aggregate principal amount of up to $115.0 million during the term of the Term Loan Facility subject to achievement of specified performance milestones, and two additional term loan advances up to an aggregate principal amount of $25.0 million subject to certain terms and conditions, on or prior to the end of the interest-only period. The Company intends to use the proceeds of the Term Loan Facility for working capital and general corporate purposes. The Loan Agreement was subsequently amended (the "Amendment") on June 28, 2023 pursuant to which the Company agreed to draw an initial term loan advance in an aggregate principal amount not less than $30.0 million, provided that the aggregate amount of the term loan advances made under tranche 1 do not exceed $30.0 million, which reflects a decrease of $30.0 million from the $60.0 million in the original Loan Agreement for tranche 1. The total amount of the Loan Agreement, as well as the outstanding balance of the loan, was unchanged, but the option to borrow additional funds were redistributed from tranche 1 to tranche 2. A second amendment was made to the Loan Agreement (the "Second Amendment") on December 22, 2023 pursuant to which the Company agreed to draw a term loan advance in an aggregate principal amount not less than $15.0 million, provided that the aggregate amount of the term loan advances made under tranche 2 do not exceed $15.0 million on or prior to December 31, 2023. The Second Amendment re-allocated the total future consideration of the Loan Agreement to the future tranches extending through September 2026, subject to the terms and conditions of the Loan Agreement. The Second Amendment did not change the total aggregate maximum principal amount to be drawn under the Loan Agreement, which remained up to $200.0 million. Upon closing of the Second Amendment on December 22, 2023, the Company drew down the tranche 2 amount of $15.0 million. A third amendment was made to the Loan Agreement (the "Third Amendment") on January 29, 2026 (the "Third Amendment Closing Date") pursuant to which the Company drew down the tranche 3 loan advance amount of $35.0 million. The Third Amendment maintains a $200.0 million maximum principal amount and re-allocates the future tranches extending through December 2027, subject to the terms and conditions of the Loan Agreement. In addition, the Third Amendment extends the amortization date, with a balloon payment, inclusive of accrued interest and principal due on the maturity date of October 1, 2027. The Third Amendment provides that if the Company receives FDA approval prior to October 1, 2027, the amortization and maturity date shall be extended to October 1, 2029. Borrowings under the Loan Agreement are repayable in monthly interest-only payments through September 2027, with the outstanding principal balance of the Term Loan Facility bearing interest payable in cash at a floating rate per annum equal to the greater of (i) 8.50% and (ii) the Prime Rate plus 1.75%. The principal balance of the Term Loan Facility will also bear “payment-in-kind” interest at the rate of 1.50% (“PIK Interest”), which PIK Interest will be added to the outstanding principal balance of the Term Loan Facility on each interest payment date. At the Company's option, the Company may prepay all or a portion of the outstanding borrowings, subject to a prepayment fee of 3.0% of the principal amount if prepayment occurs during the 12 months following the Third Amendment Closing Date, 2.0% after 12 months following the Third Amendment Closing Date but prior to 36 months following the Closing Date, and 1.0% thereafter. The Loan Agreement contains customary facility fees, events of default and representations, warranties and affirmative and negative covenants, including a financial covenant requiring the Company to maintain unrestricted cash in an amount not less than 35% of the aggregate outstanding secured obligations under the Loan Agreement in accounts subject to a control agreement in favor of the Agent (the “Unrestricted Cash”) at all times commencing on January 1, 2024. In addition, the Loan Agreement, as amended, also contains a financial covenant that beginning on the later of (i) July 1, 2026 and (ii) the date on which the aggregate outstanding principal amount of the Term Loan Facility is equal to or greater than $100.0 million, the Company is required to satisfy one of the following requirements: (1) achieve a minimum amount of trailing three-month net product revenue tested on a monthly basis, (2) maintain a market capitalization in excess of $1.2 billion and Unrestricted Cash in an amount no less than 50% of the outstanding amount under the Term Loan Facility, or (3) maintain Unrestricted Cash in an amount no less than 85% of the outstanding amount under the Term Loan Facility. The Company paid a $0.5 million facility charge and incurred debt issuance costs of $1.5 million upon closing of the Loan Agreement. The Loan Agreement also provides for a final payment, payable upon maturity or the repayment of the obligations in full or in part (on a pro rata basis), equal to 4.95% of the aggregate principal amount of Term Loans advanced to the Borrower and repaid on such date, which is being accrued on the Company's consolidated balance sheet. As of March 31, 2026 and 2025, the amount accrued for the final payment was $1.7 million and $1.0 million, respectively. Unamortized debt issuance costs are recorded as a reduction of the carrying amount on the term loan and amortized as interest expense using the effective-interest method. In addition, unamortized deferred financing costs of $0.5 million and $0.9 million were recorded in other assets as of March 31, 2026 and 2025, respectively, related to the Company's right to borrow additional amounts from Hercules in the future and amortized to interest expense over the relevant draw period on a straight-line basis. Interest expense for the twelve months ended March 31, 2026 and 2025 was $6.8 million and $5.8 million, respectively. The summary of obligations under the term loan as of March 31, 2026 and 2025 consisted of the following (in thousands):
| March 31, 2026 |  | March 31, 2025 |  |
Principal loan balance | $ | 82,252 |  |  | $ | 46,450 |  |  |
Facility charge and diligence fee | (120) |  |  | (201) |  |  |
Unamortized issuance costs | (536) |  |  | (901) |  |  |
Accumulated end of term fee | 1,712 |  |  | 1,029 |  |  |
Long term debt, net | $ | 83,308 |  |  | $ | 46,377 |  |  |
The annual principal payments by fiscal year due under the Loan Agreement as of March 31, 2026 were as follows:
| March 31, 2026
2027 | $ | — |
2028 | 84,150 |
Total | $ | 84,150 |
The table of future payments of long-term debt excludes the end of term charge of $4.0 million, which is due upon the maturity of the loan.

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- 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 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