Debt - Summary of Components of Debt Obligations (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 341,250,000	$ 316,250,000
Less: deferred debt discount	(19,169,000)	(26,310,000)
Less: deferred debt issue costs	(2,726,000)	(3,809,000)
Long-term debt, net	319,355,000	286,131,000
Additional paid-in capital	35,306,000	35,306,000
Discount attribution to equity	(1,175,000)	(1,175,000)
Equity component, net	34,131,000	34,131,000
Current portion of long-term debt	0	0
2023 Convertible Notes
Debt Instrument [Line Items]
Total debt	316,250,000	316,250,000
Credit Facility
Debt Instrument [Line Items]
Total debt	$ 25,000,000	$ 0