Convertible Senior Notes - Schedule of Convertible Debt (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Amortization of debt discount and issuance costs		$ 6,518	$ 0
The Notes | Convertible Notes
Debt Instrument [Line Items]
Principal amount of Notes	$ 230,000	230,000		$ 230,000
Less: unamortized debt discount and issuance costs	(74,129)	(74,129)		(80,647)
Net carrying amount of Notes	155,871	155,871		149,353
Equity component — net carrying amount	75,333	75,333		$ 75,333
Contractual coupon interest	1,581	4,777
Amortization of debt discount and issuance costs	2,238	6,518
Total interest expense	$ 3,819	$ 11,295