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v3.22.2

Unsecured Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2022
Debt Instrument [Line Items] |
Summary of unsecured convertible senior notes outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance as of June 30, 2022
​ |  | 2023 Notes |  | 2026 Notes |  | Total
​ | ​ | (In thousands)
Principal amount | ​ | $ | 95,000 | ​ | $ | 225,030 | ​ | $ | 320,030
Unamortized debt issuance costs | ​ |  | (956) | ​ |  | (4,716) | ​ |  | (5,672)
Total unsecured convertible senior notes, net | ​ | $ | 94,044 | ​ | $ | 220,314 | ​ | $ | 314,358
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of outstanding unsecured convertible senior notes (1) | ​ | $ | 85,263 | ​ | $ | 132,064 | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance as of December 31, 2021
​ |  | 2023 Notes |  | 2026 Notes |  | Total
​ | ​ | (In thousands)
Principal amount | ​ | $ | 95,000 | ​ | $ | 225,030 | ​ | $ | 320,030
Unamortized discount | ​ |  | (1,282) | ​ |  | (5,290) | ​ |  | (6,572)
Total unsecured convertible senior notes, net | ​ | $ | 93,718 | ​ | $ | 219,740 | ​ | $ | 313,458
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of outstanding unsecured convertible senior notes (1) | ​ | $ | 87,163 | ​ | $ | 171,867 | ​ | ​ | ​
(1) | The fair value is classified as Level 3 due to the limited trading activity for the unsecured convertible senior notes.
​
Schedule of future minimum payments of debt | ​
​ | ​ | ​ | ​
​ |  | (In thousands)
2023 |  | $ | 95,000
2024 |  | ​ | —
2025 |  | ​ | —
2026 |  | ​ | 225,030
2027 | ​ | ​ | —
Total future minimum principal payments under the 2023 Notes and 2026 Notes |  | $ | 320,030
2023 Unsecured Convertible Senior Notes |
Debt Instrument [Line Items] |
Schedule of total interest expense recognized | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | ​ | 2022 |  | 2021 | ​ | 2022 |  | 2021
​ | ​ | (In thousands) | ​ | (In thousands)
Contractual interest expense | ​ | $ | 1,484 | ​ | $ | 1,484 | ​ | $ | 2,969 | ​ | $ | 2,969
Amortization of debt issuance costs | ​ |  | 164 | ​ |  | 153 | ​ |  | 325 | ​ |  | 303
Total | ​ | $ | 1,648 | ​ | $ | 1,637 | ​ | $ | 3,294 | ​ | $ | 3,272
2026 Unsecured Convertible Senior Notes |
Debt Instrument [Line Items] |
Schedule of total interest expense recognized | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ | 2022 |  | 2021 | ​ | 2022 | ​ | 2021
​ | (In thousands) | ​ | (In thousands)
Contractual interest expense | $ | 2,954 | ​ | $ | 2,954 | ​ | $ | 5,907 | ​ | $ | 5,907
Amortization of debt issuance costs |  | 290 | ​ |  | 273 | ​ | ​ | 575 | ​ | ​ | 519
Total | $ | 3,244 | ​ | $ | 3,227 | ​ | $ | 6,482 | ​ | $ | 6,426

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