Convertible Senior Notes Due 2023 - Summary of liability component of 2023 Notes (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Total carrying value	$ 400,382,000	$ 379,252,000
Convertible Debt
Debt Instrument [Line Items]
2023 Notes	402,500,000	402,500,000
Unamortized debt discount and deferred financing costs	(2,118,000)	(23,248,000)
Total carrying value	400,382,000	379,252,000
Convertible Notes | Level 2
Debt Instrument [Line Items]
Total carrying value	400,382,000	379,252,000
Fair Value (Level 2)	$ 395,456,000	$ 400,236,000