Convertible Senior Notes - Schedule of Convertible Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Amortization of debt discount and issuance costs	$ 2,098,000	$ 0
Initial Notes | Convertible Notes
Debt Instrument [Line Items]
Principal amount of Notes	230,000,000		$ 230,000,000
Less: unamortized debt discount and issuance costs	(78,549,000)		(80,647,000)
Net carrying amount of Notes	151,451,000	0	149,353,000
Total interest expense		$ 0
The Notes | Convertible Notes
Debt Instrument [Line Items]
Less: unamortized debt discount and issuance costs	(78,500,000)
Equity component — net carrying amount	75,333,000		$ 75,333,000
Contractual coupon interest	1,615,000
Amortization of debt discount and issuance costs	2,098,000
Total interest expense	$ 3,713,000