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Convertible Senior Notes, Net - Schedule of Net Carrying Amount of Liability Component of Notes (Details) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
2025 Convertible Senior Notes as Liability Component
Debt Disclosure [Line Items]
Principal	$ 172,500,000	$ 172,500,000
Unamortized debt discount	(17,074,000)	(17,945,000)
Unamortized debt issuance costs	(5,105,000)	(5,367,000)
Net carrying amount	150,321,000	$ 149,188,000
2028 Convertible Senior Notes as Liability Component
Debt Disclosure [Line Items]
Principal	287,500,000
Unamortized debt discount	(95,522,000)
Unamortized debt issuance costs	(6,188,000)
Net carrying amount	$ 185,790,000

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