Long-term Debt - Liability and Equity Component of Note (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Liability component:
Net carrying amount	$ 392,907	$ 326,126
Convertible debt | 2023 Notes
Liability component:
Principal			$ 5,100
Convertible debt | 2025 Notes
Liability component:
Principal	23,293	23,293
Debt Instrument, Unamortized Discount (Premium), Net		(3,724)
Less: Unamortized debt issuance costs	(493)	(417)
Net carrying amount	22,800	19,152
Convertible debt | 2026 Notes
Liability component:
Principal	380,000	380,000
Debt Instrument, Unamortized Discount (Premium), Net		(64,413)
Less: Unamortized debt issuance costs	(9,893)	(8,613)
Net carrying amount	$ 370,107	$ 306,974