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Convertible Senior Notes | 9 Months Ended
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Sep. 30, 2023
Convertible Senior Notes |
Convertible Senior Notes | Note 11. Convertible Senior Notes Convertible Senior Notes payable consisted of the following at September 30, 2023 and December 31, 2022 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ |  | 2023 |  | 2022
Principal amount of 2025 Senior Notes | ​ | $ | 14,344 | ​ | $ | 14,344
Principal amount of 2026 Senior Notes | ​ |  | 371,185 | ​ |  | 402,500
Less: unamortized debt issuance costs | ​ | ​ | (7,574) | ​ | ​ | (10,136)
Net carrying value of Convertible Senior Notes payable | ​ | $ | 377,955 | ​ | $ | 406,708
​ Interest expense incurred in connection with the Convertible Senior Notes consisted of the following for the three and nine months ended September 30, 2023 and 2022 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended |  | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022
Coupon interest | ​ | $ | 852 | ​ | $ | 881 | ​ | $ | 2,576 | ​ | $ | 2,616
Amortization of debt issuance costs | ​ | ​ | 645 | ​ | ​ | 635 | ​ | ​ | 1,928 | ​ | ​ | 1,903
Total interest expense on Convertible Senior Notes | ​ | $ | 1,497 | ​ | $ | 1,516 | ​ | $ | 4,504 | ​ | $ | 4,519
​ The Company’s 2025 Senior Notes and 2026 Senior Notes payable of $14.3 million and $371.2 million, respectively, are due and payable in 2025 and 2026, respectively. In September 2023, the Company entered into separate, privately negotiated transactions with certain holders of the 2026 Senior Notes to repurchase $31.3 million in aggregate principal amount of the 2026 Senior Notes for a repurchase price of $25.0 million in cash. The Company recorded $5.7 million as a gain on extinguishment of debt on its condensed consolidated statement of operations for the three and nine months ended September 30, 2023, which includes the write off of $0.6 million of unamortized debt issuance costs. Following these repurchases, approximately $371.2 million principal amount of the 2026 Senior Notes remain outstanding. See Note 10 – 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, 2022 for additional information related to the Company’s Convertible Senior Notes.

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