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Unsecured Convertible Senior Notes (Tables) | 6 Months Ended
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Jun. 30, 2021
Debt Instrument [Line Items] |
Summary of unsecured convertible senior notes outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance as of June 30, 2021
​ |  | 2023 Notes |  | 2026 Notes |  | Total
​ | ​ | (In thousands)
Principal amount | ​ | $ | 95,000 | ​ | $ | 225,030 | ​ | $ | 320,030
Unamortized debt issuance costs | ​ |  | (1,596) | ​ |  | (5,849) | ​ |  | (7,445)
Total unsecured convertible senior notes, net | ​ | $ | 93,404 | ​ | $ | 219,181 | ​ | $ | 312,585
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of outstanding unsecured convertible senior notes (1) | ​ | $ | 104,856 | ​ | $ | 251,192 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amount by which the unsecured convertible senior notes if-converted value exceeds their principal amount | ​ | $ | 9,856 | ​ | $ | 26,162 | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Balance as of December 31, 2020
​ |  | 2023 Notes |  | 2026 Notes |  | Total
​ | ​ | (In thousands)
Principal amount | ​ | $ | 95,000 | ​ | $ | 225,030 | ​ | $ | 320,030
Unamortized discount | ​ |  | (17,101) | ​ |  | (60,544) | ​ |  | (77,645)
Unamortized issuance costs attributable to liability component | ​ |  | (1,481) | ​ |  | (4,616) | ​ |  | (6,097)
Total unsecured convertible senior notes, net | ​ | $ | 76,418 | ​ | $ | 159,870 | ​ | $ | 236,288
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fair value of outstanding unsecured convertible senior notes (1) | ​ | $ | 101,769 | ​ | $ | 246,779 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amount by which the unsecured convertible senior notes if-converted value exceeds their principal amount | ​ | $ | 6,769 | ​ | $ | 21,749 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity component | ​ | $ | 25,854 | ​ | $ | 63,544 | ​ | ​ | ​
Unamortized issuance costs | ​ |  | (837) | ​ |  | (1,916) | ​ | ​ | ​
Net carrying amount of equity component (2) | ​ | $ | 25,017 | ​ | $ | 61,628 | ​ | ​ | ​
(1) | The fair value is classified as Level 3 due to the limited trading activity for the unsecured convertible senior notes.
(2) | Included in the Condensed Consolidated Balance Sheet within additional paid-in capital at December 31, 2020. With adoption of ASU 2020-06 on January 1, 2021, amounts were reclassified to unsecured convertible senior notes, net.
Schedule of future minimum payments of debt | ​
​ | ​ | ​ | ​
​ |  | (In thousands)
2021 | ​ | $ | —
2022 |  | ​ | —
2023 |  | ​ | 95,000
2024 |  | ​ | —
2025 |  | ​ | —
2026 |  | ​ | 225,030
Total future minimum payments under the convertible senior 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, | ​
​ | ​ | 2021 |  | 2020 |  | 2021 |  | 2020 |
​ | ​ | (In thousands) | ​ | (In thousands)
Contractual interest expense | ​ | $ | 1,484 | ​ | $ | 3,281 | ​ | $ | 2,969 | ​ | $ | 6,563 | ​
Amortization of debt issuance costs | ​ |  | 153 | ​ |  | 209 | ​ |  | 303 | ​ |  | 411 | ​
Amortization of debt discount | ​ |  | - | ​ |  | 2,417 | ​ |  | — | ​ |  | 4,748 | ​
Total | ​ | $ | 1,637 | ​ | $ | 5,907 | ​ | $ | 3,272 | ​ | $ | 11,722 | ​
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,
​ | ​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020
​ | ​ | (In thousands) | ​ | (In thousands)
Contractual interest expense | ​ | $ | 2,954 | ​ | $ | — | ​ | $ | 5,907 | ​ | $ | —
Amortization of debt issuance costs | ​ | ​ | 273 | ​ | ​ | — | ​ |  | 519 | ​ |  | —
Total | ​ | $ | 3,227 | ​ | $ | — | ​ | $ | 6,426 | ​ | $ | —

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