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Debt | 12 Months Ended
--- | ---
Dec. 31, 2024
Debt Disclosure [Abstract] |
Debt | 7. Debt Total carrying value of debt consists of the following (in thousands):
|  | December 31, 2024 |  |  | December 31, 2023 |
Convertible notes: |  |  |  |  |  |
2014 Notes |  | $ | 299 |  |  | $ | 569 |
2019 Notes, current |  |  | — |  |  |  | 54,530 |
Total convertible notes, net |  |  | 299 |  |  |  | 55,099 |
Term loan, non-current |  |  | — |  |  |  | 3,414 |
Term loan, current |  |  | — |  |  |  | 5,000 |
Total debt |  | $ | 299 |  |  | $ | 63,513 |
Convertible Notes In February 2014, the Company closed an underwritten public offering of the 2014 Notes, which will mature on February 1, 2034, unless earlier converted, redeemed or repurchased in accordance with the terms of the 2014 Notes. Holders may require the Company to repurchase all or a portion of their outstanding 2014 Notes at a repurchase price in cash equal to 100% of the principal amount of the 2014 Notes plus accrued and unpaid interest. On February 6, 2024, one holder of the 2014 Notes exercised their repurchase right available at such time, and the Company repurchased an immaterial amount of principal and accrued interest. In November 2019, the Company issued $55.0 million aggregate principal amount of the 2019 Notes. Net proceeds from the 2019 Notes issuance of $52.7 million, after deductions for commissions and other debt issuance costs, were used to retire all but $1.1 million of the aggregate principal value of the 2014 Notes then outstanding. The 2019 Notes bore interest at 5.25% per annum and were payable semiannually on June 1 and December 1 of each year. The 2019 Notes matured on December 1, 2024 and were fully repaid by the Company. Term Loan Facility, net On August 2, 2021, the Company amended its revolving credit facility to, amongst other things, provide for the Term Loan Facility. As of December 31, 2023, the Term Loan Facility was fully drawn with an outstanding principal balance of $7.9 million and a carrying value of $8.4 million. The interest rate on the Term Loan Facility was the greater of 4.0% per annum or a floating per annum rate equal to the prime rate plus 0.75%. Interest on any outstanding term loan advances was due and payable monthly. In addition to the monthly interest payments, a final payment equal to 6.5% of the original principal amount of each advance was due the earlier of the maturity date or the date the advance is repaid. Principal balances were required to be repaid in 24 equal installments which began on August 1, 2023. On March 4, 2024, the Company fully repaid all outstanding indebtedness owed pursuant to the Term Loan Facility and terminated the agreement. Bridge Loans On January 23, 2022, the Company entered into separate loan agreements (collectively, the "Bridge Loan Agreements") with various investors for the Bridge Loans. The Bridge Loans were fully drawn on January 24, 2022, and automatically converted into Series B Redeemable Preferred Stock upon the subsequent closing of the Private Placement Issuance on April 4, 2022 (the "Private Placement Issuance closing date"). Applying the guidance in ASC 825 Financial Instruments, the Company elected to record the Bridge Loans at their fair value using a probability-weighted expected return method for the valuation analysis of the Bridge Loans. This resulted in a $13.7 million change in fair value of the Bridge Loans from $25.0 million at inception to $38.7 million as of the Private Placement Issuance closing date, including the portion attributable to accrued interest, which is reflected as a non-operating unrealized loss on the Bridge Loans in the accompanying consolidated statements of operations for the year ended December 31, 2022.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 470 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/470/tableOfContent + Details
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