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Financial Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2024
Financial Liabilities |
Schedule of Company's Debt Obligations | A summary of the Company’s debt obligations, including level within the fair value hierarchy (see Note 3. Fair Value Measurements), is as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | At June 30, 2024
(in thousands) | Principal Amount | ​ | ​ | Unamortized Debt Discount and Debt Issuance Costs | ​ | Net Carrying Value | ​ | Estimated Fair Value |  | Level
Financial Liabilities: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ |
2029 Term Loan | $ | 38,660 | ​ | $ | (2,119) | ​ | $ | 36,541 | ​ | $ | 36,541 | ​ | Level 2*
2026 Convertible Notes | $ | 230,000 | ​ | $ | (2,445) | ​ | $ | 227,555 | ​ | $ | 170,200 | ​ | Level 2**
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | At December 31, 2023
Financial Liabilities: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  |
2027 Term Loans | $ | 250,000 | ​ | $ | (3,519) | ​ | $ | 246,481 | ​ | $ | 246,481 | ​ | Level 2*
2026 Convertible Notes | $ | 230,000 | ​ | $ | (3,112) | ​ | $ | 226,888 | ​ | $ | 150,155 | ​ | Level 2**
​
* | The principal amounts outstanding are subject to variable interest rates based on three-month SOFR plus fixed percentages. Therefore, the Company believes the carrying amount of these obligations approximate their fair values.
** | The fair value is influenced by interest rates, the Company’s stock price and stock price volatility and is determined by prices observed in market trading. Since the market for trading of the 2026 Convertible Notes is not considered to be an active market, the estimated fair value is based on Level 2 inputs.
2029 Term Loans |
Financial Liabilities |
Schedule of Future Payments on Debt | Assuming the second quarter of 2024 interest rate of 13.3%, future payments on the 2029 Term Loan as of June 30, 2024 are as follows:
​ | ​ | ​ | ​
Year ending December 31, (in thousands) | ​ | ​ | ​
Remainder of 2024 - interest only | ​ | $ | 2,632
2025 - interest only | ​ |  | 5,221
2026 - interest only | ​ |  | 5,222
2027 - interest only | ​ | ​ | 5,222
2028 and thereafter - principal and interest | ​ | ​ | 45,712
Total minimum payments | ​ | ​ | 64,009
Less amount representing interest | ​ |  | (25,349)
2029 Term Loan, gross | ​ |  | 38,660
Less unamortized debt discount and debt issuance costs | ​ |  | (2,119)
Net carrying amount of 2029 Term Loan | ​ | $ | 36,541
Schedule of royalty participation liability | ​
​ | ​ | ​ | ​ | ​
​ | ​ |  | June 30,
(in thousands) | Balance Sheet Classification | ​ | 2024
Revenue participation liability, current | Accrued and other current liabilities | ​ | $ | 2,682
Revenue participation liability, non-current | Other liabilities, non-current | ​ | ​ | 25,963
Total | ​ | ​ | $ | 28,645
2027 Term Loans |
Financial Liabilities |
Schedule of Components of Interest Expense | The following table presents the components of interest expense related to the 2027 Term Loans:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(in thousands) | ​ | 2024 | ​ | 2023 | ​ | 2024 | ​ | 2023
Contractual interest | ​ | $ | 1,169 | ​ | $ | 8,469 | ​ | $ | 9,916 | ​ | $ | 16,614
Amortization of debt discount and debt issuance costs | ​ | ​ | 305 | ​ | ​ | 243 | ​ | ​ | 1,277 | ​ | ​ | 575
Total interest expense | ​ | $ | 1,474 | ​ | $ | 8,712 | ​ | $ | 11,193 | ​ | $ | 17,189
1.5% Convertible Senior Subordinated Notes due 2026 |
Financial Liabilities |
Schedule of Future Payments on Debt | Future payments on the 2026 Convertible Notes as of June 30, 2024 are as follows:
​ | ​ | ​ | ​
Year ending December 31, (in thousands) |  | ​ | ​
Remainder of 2024 - interest only | ​ | $ | 1,725
2025 - interest only | ​ |  | 3,450
2026 - principal and interest | ​ |  | 231,725
Total minimum payments | ​ |  | 236,900
Less amount representing interest | ​ |  | (6,900)
2026 Convertible Notes, principal amount | ​ |  | 230,000
Less unamortized debt discount and debt issuance costs | ​ |  | (2,445)
Net carrying amount of 2026 Convertible Notes | ​ | $ | 227,555
​
Schedule of Components of Interest Expense | The following table presents the components of interest expense related to the 2026 Convertible Notes: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(in thousands) |  | 2024 | ​ | 2023 | ​ | 2024 |  | 2023
Stated coupon interest | ​ | $ | 862 | ​ | $ | 862 | ​ | $ | 1,725 | ​ | $ | 1,725
Amortization of debt discount and debt issuance costs | ​ |  | 335 | ​ |  | 327 | ​ |  | 667 | ​ |  | 653
Total interest expense | ​ | $ | 1,197 | ​ | $ | 1,189 | ​ | $ | 2,392 | ​ | $ | 2,378

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