Convertible Senior Notes - Schedule of Convertible Debt (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Amortization of debt discount and issuance costs			$ 4,281,000	$ 0
The Notes | Convertible Notes
Debt Instrument [Line Items]
Principal amount of Notes	$ 230,000,000		230,000,000		$ 230,000,000
Less: unamortized debt discount and issuance costs	(76,366,000)		(76,366,000)		(80,647,000)
Net carrying amount of Notes	153,634,000	$ 0	153,634,000	0	149,353,000
Equity component — net carrying amount	75,333,000		75,333,000		$ 75,333,000
Contractual coupon interest	1,581,000		3,196,000
Amortization of debt discount and issuance costs	2,183,000		4,280,000
Total interest expense	$ 3,764,000	$ 0	$ 7,476,000	$ 0