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Convertible Senior Notes | 6 Months Ended
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Jun. 30, 2025
Convertible Senior Notes |
Convertible Senior Notes | Note 11. Convertible Senior Notes June 30, 2025 and December 31, 2024 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31, | ​
​ |  | 2025 |  | 2024 |
Principal amount of 2025 Senior Notes | ​ | $ | — | ​ | $ | 14,344 | ​
Principal amount of 2026 Senior Notes | ​ |  | 186,185 | ​ |  | 186,185 | ​
Less: unamortized debt issuance costs | ​ | ​ | (1,681) | ​ | ​ | (2,312) | ​
Total carrying value of Convertible Senior Notes, net | ​ | ​ | 184,504 | ​ | ​ | 198,217 | ​
Less: current portion of carrying value of Convertible Senior Notes, net | ​ | ​ | — | ​ | ​ | (14,298) | ​
Total carrying value of Convertible Senior Notes, net - long-term | ​ | $ | 184,504 | ​ | $ | 183,919 | ​
​ Interest expense incurred in connection with the Convertible Senior Notes consisted of the following for the three and six months ended June 30, 2025 and 2024 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended |  | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
Coupon interest | ​ | $ | 421 | ​ | $ | 797 | ​ | $ | 878 | ​ | $ | 1,601
Amortization of debt issuance costs | ​ | ​ | 312 | ​ | ​ | 598 | ​ | ​ | 631 | ​ | ​ | 1,198
Total interest expense on Convertible Senior Notes | ​ | $ | 733 | ​ | $ | 1,395 | ​ | $ | 1,509 | ​ | $ | 2,799
​ The 2025 Senior Notes matured on June 1, 2025, and the 2025 Senior Notes payable of $14.3 million was repaid. The 2026 Senior Notes payable of $186.2 million are due and payable in December 2026. In May 2024, the Company entered into separate, privately negotiated transactions with certain holders of the 2026 Senior Notes to repurchase $10.0 million in aggregate principal amount of the 2026 Senior Notes for a repurchase price of $8.7 in cash. The Company recorded $1.2 million as a gain on extinguishment of debt on its condensed consolidated statement of operations for the three and six months ended June 30, 2024, which includes the write off of $0.2 million of unamortized debt issuance costs. See Note 12 – Convertible Senior Notes to the Company’s consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024, for additional information related to the Convertible Senior Notes.

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