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Convertible Senior Notes (Tables) - Convertible senior notes | 9 Months Ended
--- | ---
Sep. 30, 2023
Debt Instrument [Line Items] |
Schedule of convertible notes outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | 2026 Convertible Notes | ​ | 2029 Convertible Notes | ​ | Total Convertible Notes
Principal | $ | 26,350 | ​ | $ | 241,500 | ​ | $ | 267,850
Less: unamortized issuance costs | ​ | (401) | ​ | ​ | (5,626) | ​ | ​ | (6,027)
Net carrying amount | $ | 25,949 | ​ | $ | 235,874 | ​ | $ | 261,823
Schedule of total interest expense recognized related to the convertible notes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ | 2023 | ​ | 2022 | ​ | 2023 | ​ | 2022
Contractual interest expense | $ | 1,909 | ​ | $ | 943 | ​ | $ | 5,297 | ​ | $ | 2,830
Amortization of debt issuance costs | ​ | 302 | ​ | ​ | 228 | ​ | ​ | 863 | ​ | ​ | 678
Total interest expense | $ | 2,211 | ​ | $ | 1,171 | ​ | $ | 6,160 | ​ | $ | 3,508
Schedule of future minimum payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, | 2026 Convertible Notes | ​ | 2029 Convertible Notes | ​ | Total Convertible Notes
2023 | $ | — | ​ | $ | — | ​ | $ | —
2024 | ​ | 692 | ​ | ​ | 6,943 | ​ | ​ | 7,635
2025 | ​ | 692 | ​ | ​ | 6,943 | ​ | ​ | 7,635
2026 | ​ | 26,696 | ​ | ​ | 6,943 | ​ | ​ | 33,639
2027 | ​ | — | ​ | ​ | 6,943 | ​ | ​ | 6,943
Thereafter | ​ | — | ​ | ​ | 251,915 | ​ | ​ | 251,915
Total minimum payments | $ | 28,080 | ​ | $ | 279,687 | ​ | $ | 307,767
Less: interest | ​ | (1,730) | ​ | ​ | (38,187) | ​ | ​ | (39,917)
Less: unamortized issuance costs | ​ | (401) | ​ | ​ | (5,626) | ​ | ​ | (6,027)
Convertible Notes carrying value | $ | 25,949 | ​ | $ | 235,874 | ​ | $ | 261,823
​

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