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Debt - Components (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | May 12, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Fair value of embedded derivative | $ 900 | $ 4,900 |
2025 Notes | Convertible debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 161,898 | 166,898 | $ 180,400
Fair value of embedded derivative | 926 | 4,898 |
Unamortized debt discount | (2,761) | (3,703) |
Unamortized issuance costs | (2,197) | (2,946) |
Net carrying amount | $ 157,866 | $ 165,147 |

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