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Convertible Senior Notes (Tables) - Convertible senior notes | 6 Months Ended
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Jun. 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 | ​ | (443) | ​ | ​ | (5,886) | ​ | ​ | (6,329)
Net carrying amount | $ | 25,907 | ​ | $ | 235,614 | ​ | $ | 261,521
Schedule of total interest expense recognized related to the convertible notes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | 2023 | ​ | 2022 | ​ | 2023 | ​ | 2022
Contractual interest expense | $ | 1,909 | ​ | $ | 943 | ​ | $ | 3,388 | ​ | $ | 1,887
Amortization of debt issuance costs | ​ | 298 | ​ | ​ | 226 | ​ | ​ | 561 | ​ | ​ | 449
Total interest expense | $ | 2,207 | ​ | $ | 1,169 | ​ | $ | 3,949 | ​ | $ | 2,336
Schedule of future minimum payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, | 2026 Convertible Notes | ​ | 2029 Convertible Notes | ​ | Total Convertible Notes
2023 | $ | 346 | ​ | $ | 3,568 | ​ | $ | 3,914
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 | $ | 28,426 | ​ | $ | 283,255 | ​ | $ | 311,681
Less: interest | ​ | (2,076) | ​ | ​ | (41,755) | ​ | ​ | (43,831)
Less: unamortized issuance costs | ​ | (443) | ​ | ​ | (5,886) | ​ | ​ | (6,329)
Convertible Notes carrying value | $ | 25,907 | ​ | $ | 235,614 | ​ | $ | 261,521

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