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Long-Term Debt and Convertible Notes
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Long-Term Debt and Convertible Notes

8. Long-Term Debt and Convertible Notes

Working Capital Facility Agreement

On August 9, 2023, we entered into a working capital facility agreement (the "Initial Working Capital Facility Agreement") with Hercules Capital, Inc., as administrative agent, collateral agent, and lender (the “Lender”). The Initial Working Capital Facility Agreement provided for an aggregate principal amount of up to $50.0 million with tranched availability as follows: (i) $25.0 million at closing on August 9, 2023 ("tranche 1A"), (ii) $5.0 million available through December 15, 2024 ("tranche 1B") and (iii) $20.0 million available from the earlier of: (a) the full draw of tranche 1B and (b) the expiration of tranche 1B, and available through December 15, 2025 ("tranche 1C"), and in the case of tranches 1B and 1C, subject to certain customary conditions to draw down.

The Initial Working Capital Facility Agreement had a term of four years, with a springing maturity date that was 91 days prior to the stated maturity of our 2026 Convertible Notes (as defined below), if still outstanding at such time. The loans thereunder did not have any scheduled amortization payments and accrued interest at a floating rate equal to 9.95% per annum, payable in cash on a monthly basis and upon maturity or payoff. In addition, any loans under the Initial Working Capital Facility Agreement also accrued paid-in-kind interest at a fixed rate of 1.5% per annum which was due upon maturity or payoff.

In addition, in connection with the tranche 1A funding, we issued warrants to the Lender to purchase up to 297,619 shares of our common stock at an exercise price of $1.68 per share (the "Lender Warrants"). The Lender Warrants are equal to 2.00% of the principal amount of the tranche 1A loans funded by the Lender (the "Warrant Coverage"). The Initial Working Capital Facility Agreement also required that we issue additional warrants to the Lender at the time of each draw down of tranches 1B and 1C with the same Warrant Coverage. Each Lender Warrant is exercisable for seven years from the date of issuance. The Lender Warrant issued in conjunction with the tranche 1A funding remains outstanding at September 30, 2025.

On February 13, 2025, we entered into an amendment to the Initial Working Capital Facility Agreement (the “First Amendment to the Working Capital Facility Agreement”) to extend the maturity date to the earlier of (a) September 1, 2027 and (b) to the extent that any of the 2026 Convertible Notes remain outstanding on such date, (i) May 12, 2026 or (ii) in the event that the maturity date of any 2026 Convertible Notes is extended, prior to May 12, 2026, to August 11, 2026, or later, the date that is 91 days prior to the maturity date of such further extended 2026 Convertible Notes.

On August 8, 2025, we entered into an amendment to the Initial Working Capital Facility Agreement, as amended by the First Amendment to the Working Capital Facility Agreement (the “Second Amendment to the Working Capital Facility Agreement”). The Second Amendment to the Working Capital Facility Agreement (i) provides for an aggregate principal amount of up to $150.0 million plus the accrued and unpaid paid-in-kind interest on the existing debt under the Initial Working Capital Facility Agreement at closing on August 12, 2025, (ii) extends the maturity date under the First Amendment to the Working Capital Facility Agreement to September 1, 2030, (iii) adjusts the interest rate to Prime, with a 7.5% floor, plus 1.95%, (iv) adjusts the paid-in-kind interest rate to 1.0% per annum, which is due upon maturity or payoff, (iv) provides for payment of a 1.0% upfront facility charge and an end of term charge of up to 6.25% of principal drawn. The loans under the Second Amendment to the Working Capital Facility Agreement do not have any scheduled amortization payments. The approximately $150.0 million aggregate principal has tranched availability as follows: (i) $110.0 million plus capitalized paid-in-kind interest of approximately $0.8 million on August 12, 2025 (“tranche 1”), (ii) $20.0 million available through December 15, 2026 (“tranche 2”) and (iii) $20.0 million available from the earlier of: (a) the full draw of tranche 2 and (b) September 30, 2027 (“tranche 3”), and in the case of tranches 2 and 3, subject to certain customary conditions to draw down.

The Second Amendment to the Working Capital Facility Agreement contains a minimum cash covenant, a minimum revenue covenant and a minimum EBITDA covenant. The Second Amendment to the Working Capital Facility Agreement contains customary representations and warranties and customary affirmative and negative covenants, including, among other things, restrictions on indebtedness, liens, investments, mergers, dispositions, prepayment of other indebtedness, and dividends and other distributions, subject to certain exceptions. We were in compliance with all covenants of the Second Amendment to the Working Capital Facility Agreement as of September 30, 2025. The Initial Working Capital Facility Agreement, together with the First Amendment to the Working Capital Facility Agreement and the Second Amendment to the Working Capital Facility Agreement are referred to as the “Working Capital Facility Agreement”.

The Second Amendment to the Working Capital Facility Agreement was accounted for in accordance with ASC Topic 470, Debt. Amendments are assessed by management to determine appropriate treatment as troubled debt restructurings, extinguishments

or modifications. The Second Amendment to the Working Capital Facility Agreement qualifies as a debt extinguishment and issuance of a new debt instrument. We recorded a loss on extinguishment during the quarter ended September 30, 2025, of $5.5 million, equal to the carrying value of the Second Amendment to the Working Capital Facility Agreement less the carrying value of the First Working Capital Facility Agreement on August 12, 2025 of $0.3 million, the facility charge of $1.1 million paid to the lenders, the remaining Initial Working Capital Facility Agreement end of term fee of $0.2 million and the present value of Second Amendment to the Working Capital Facility Agreement end of term fee of $3.9 million. The Initial Working Capital Facility Agreement end of term fee is payable on September 1, 2027. The remaining Second Amendment to the Working Capital Facility Agreement end of term fee will be accreted to interest expense over the term of the agreement using the effective interest rate method.

The tranche 1 funding under the Second Amendment to the Working Capital Facility Agreement of $110.0 million plus the accrued and unpaid paid-in-kind interest of $0.7 million from the Initial Working Capital Facility Agreement are accounted for as debt and was recorded as a liability on the condensed consolidated balance sheets. In addition, the additional borrowings available under the Second Amendment to the Working Capital Facility Agreement are accounted for as a single freestanding financial instrument that are not assets or obligations of ours and will be accounted for when and if we borrow additional tranches in the future.

In connection with the Second Amendment to the Working Capital Facility Agreement, we incurred debt issuance costs of $3.5 million, which was recorded as a debt discount. The debt discount is being amortized into interest expense using the effective interest rate method over the term of the Second Amendment to the Working Capital Facility Agreement. The effective interest rate as of September 30, 2025 is 11.6%.

For the three and nine months ended September 30, 2025, interest expense related to the Working Capital Facility Agreement was $2.2 million and $4.0 million, respectively, which included $1.7 million and $3.0 million, respectively, related to the stated interest rate, $0.2 million and $0.4 million, respectively, related to paid-in-kind interest, and $0.2 million and $0.6 million, respectively, related to the amortization of the debt discounts and accretion of the end of term fee.

For the three and nine months ended September 30, 2024, interest expense related to the Working Capital Facility Agreement was $0.9 million and $2.7 million, respectively, which included $0.6 million and $1.9 million, respectively, related to the stated interest rate, $0.1 million and $0.3 million, respectively, related to paid-in-kind interest, and $0.2 million and $0.5 million, respectively, related to the amortization of the debt discounts.

As of September 30, 2025, the carrying value of the Working Capital Facility Agreement was $107.5 million, which is comprised of the $110.8 million principal amount outstanding, $0.1 million of accumulated paid-in-kind interest, less debt discounts of $3.4 million. The end of term fee accreted as of September 30, 2025, of $4.7 million is recorded in other non-current liabilities on the condensed consolidated balance sheets.

2026 Senior Unsecured Convertible Notes

In May 2021, we entered into a note purchase agreement with funds affiliated with Baker Bros. Advisors LP for a private placement of $150.0 million aggregate principal amount of senior unsecured convertible notes due 2026 (the “2026 Convertible Notes”). We received a total of $149.0 million, net of issuance costs, from the issuance of the 2026 Convertible Notes.

The 2026 Convertible Notes bear interest at a rate of 1.5% per annum, payable in cash semi-annually in arrears on June 15 and December 15 of each year with a maturity date of May 26, 2026, unless earlier converted, redeemed or repurchased.

The 2026 Convertible Notes were accounted for in accordance with ASC Subtopic 470-20, Debt with Conversion and Other Options (“ASC 470-20”), and ASC Subtopic 815-40, Contracts in Entity's Own Equity (“ASC 815-40”). Under ASC 815-40, to qualify for equity classification (or non-bifurcation, if embedded), the instrument (or embedded feature) must be both (1) indexed to the issuer's stock and (2) meet the requirements of the equity classification guidance. Based upon our analysis, it was determined that the 2026 Convertible Notes do contain embedded features indexed to our common stock, but do not meet the requirements for bifurcation, and therefore do not need to be separately accounted for as an equity component. Since the embedded conversion feature meets the equity scope exception from derivative accounting, and, also since the embedded conversion option does not need to be separately accounted for as an equity component under ASC 470-20, the proceeds received from the issuance of the 2026 Convertible Notes were recorded as a liability on the condensed consolidated balance sheets.

We incurred issuance costs related to the 2026 Convertible Notes of $1.0 million, which we recorded as debt issuance costs and were included as a reduction to the 2026 Convertible Notes on the condensed consolidated balance sheets. The debt issuance costs are

being amortized to interest expense using the effective interest rate method over the term of the 2026 Convertible Notes, resulting in an effective interest rate of 1.6%.

On August 8, 2025, we entered into an exchange agreement pursuant to which $150.0 million aggregate principal amount of the 2026 Convertible Notes outstanding were exchanged for (i) 16,666,666 shares of common stock for an aggregate principal amount of $25.0 million of the 2026 Convertible Notes and (ii) the remaining $125.0 million plus accrued and unpaid interest under the 2026 Convertible Notes paid in cash, and which closed on August 12, 2025. As of September 30, 2025, no 2026 Convertible Notes remain outstanding.

The exchange agreement was accounted for in accordance with ASC 470-20, after the adoption of ASU 2024-04, whereby we concluded that the exchange did not qualify as an induced conversion. Thus, we accounted for the exchange as a debt extinguishment. We recorded a loss on extinguishment during the quarter ended September 30, 2025 of $5.8 million, which was equal to the carrying value of the 2026 Convertible Notes less the fair value of the consideration offered in the exchange. The fair value of the consideration offered in the exchange was determined to be $125.0 million for the cash consideration and $30.7 million for the common shares offered. The fair value of the common stock exchanged was determined using the closing price of the common stock on August 7, 2025.

For the three and nine months ended September 30, 2025, interest expense related to the 2026 Convertible Notes was $0.4 million and $1.6 million, respectively, which included $0.4 million and $1.5 million, respectively, related to the stated interest rate and nil and $0.1 million, respectively, related to the amortization of debt issuance costs.

For the three and nine months ended September 30, 2024, interest expense related to the 2026 Convertible Notes was $0.6 million and $1.8 million, respectively, which included $0.5 million and $1.6 million, respectively, related to the stated interest rate and $0.1 million and $0.2 million, respectively, related to the amortization of debt issuance costs.

2031 Senior Unsecured Convertible Notes

On August 8, 2025, we entered into a note purchase agreement with a fund affiliated with Rubric Capital Management LP, for a private placement of $35.0 million aggregate principal amount of senior unsecured convertible notes due 2031 (the “2031 Convertible Notes”), which closed on August 12, 2025. We received a total of $31.9 million, net of issuance costs and original issuance discount, from the issuance of the 2031 Convertible Notes.

The 2031 Convertible Notes were issued at par. The 2031 Convertible Notes bear interest at a rate of 5.0% per annum, payable in cash semi-annually in arrears on March 1 and September 1 of each year, or at a rate of 7.0% per annum for paid-in-kind interest prior to September 1, 2026. The 2031 Convertible Notes mature on March 1, 2031, unless earlier converted, redeemed or repurchased.

The 2031 Convertible Notes are subject to redemption at our option, after September 1, 2026, but only if the last reported sale price per share of our common stock exceeds 200% of the conversion price for a specified period of time. The redemption price will be equal to the principal amount of the 2031 Convertible Notes to be redeemed, plus accrued and unpaid interest.

The 2031 Convertible Notes can be settled in either shares of common stock, cash or a combination of cash and shares of common stock based on the conversion rate in effect on the date of conversion. The initial conversion rate for the 2031 Convertible Notes is 555.5556 shares per $1,000 principal amount of the 2031 Convertible Notes (equivalent to an initial conversion price of $1.80 per share of common stock), subject to certain adjustments.

If a holder of the 2031 Convertible Notes converts upon a make-whole fundamental change or Company redemption, the holder may be eligible to receive a make-whole premium through an increase to the conversion rate.

The 19,444,444 shares of common stock issuable upon the conversion, at the option of the holder, of the 2031 Convertible Notes, which includes the maximum number of shares of common stock issuable under the make-whole premium, are registered for resale pursuant to a registration statement filed with and declared effective by the SEC in September 2025.

At a special meeting of stockholders held on October 13, 2025, the Company’s stockholders approved, pursuant to Nasdaq Listing Rule 5635(d), the issuance of shares of common stock in connection with the conversion of the 2031 Convertible Notes, which could, under certain circumstances that may occur in the future, exceed 19.99% of the number of shares of the common stock issued and outstanding prior to such issuance.

The 2031 Convertible Notes were accounted for in accordance with ASC 470-20 and ASC 815-40. Under ASC 815-40, to qualify for equity classification (or non-bifurcation, if embedded), the instrument (or embedded feature) must be both (1) indexed to the issuer's stock and (2) meet the requirements of the equity classification guidance. Based upon our analysis, it was determined that the 2031 Convertible Notes do contain embedded features indexed to our common stock, but do not meet the requirements for bifurcation, and therefore do not need to be separately accounted for as an equity component. Since the embedded conversion feature meets the equity scope exception from derivative accounting, and, also since the embedded conversion option does not need to be separately accounted for as an equity component under ASC 470-20, the proceeds received from the issuance of the 2031 Convertible Notes were recorded as a liability on the condensed consolidated balance sheets.

We incurred issuance costs related to the 2031 Convertible Notes of $1.4 million, which we recorded as debt issuance costs and are included as a reduction to the 2031 Convertible Notes on the condensed consolidated balance sheets. We also incurred an original issuance discount of $1.75 million, which we recorded as a reduction to the 2031 Convertible Notes on the condensed consolidated balance sheets. The debt issuance costs and original issuance discount are being amortized to interest expense using the effective interest rate method over the term of the 2031 Convertible Notes, resulting in an effective interest rate of 7.16%.

For the three and nine months ended September 30, 2025, interest expense related to the 2031 Convertible Notes was $0.3 million, respectively, which included $0.3 million, related to paid-in-kind interest and nil, related to the amortization of debt issuance costs.

As of September 30, 2025, the carrying value of the 2031 Convertible Notes was $32.2 million, which is comprised of the $35.0 million principal amount of the 2031 Convertible Notes outstanding, $0.3 million of accumulated paid-in-kind interest, less debt issuance costs of $3.1 million.