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Summary of Significant Accounting Policies - Carrying Value and Estimated Fair Value of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
2018 Credit Agreement | 2018 Term Loan |  |
Carrying value and estimated fair value of debt |  |
Carrying Value |  | $ 126,563
Fair Value |  | 126,563
2021 Credit Agreement | 2021 Term Loan |  |
Carrying value and estimated fair value of debt |  |
Carrying Value | $ 148,125 |
Fair Value | 148,125 |
Senior Convertible Notes 2016 |  |
Carrying value and estimated fair value of debt |  |
Carrying Value | 230,000 | 230,000
Fair Value | $ 244,950 | $ 244,663

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