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Debt - Carrying Amount of Liability Component (Details) - Convertible Debt - USD ($) $ in Thousands	Dec. 31, 2020	May 01, 2020	Dec. 31, 2019	Aug. 31, 2018
Debt Instrument [Line Items]
Principal	$ 460,000
Unamortized debt discount	(73,355)
Unamortized issuance costs	(8,059)
Net carrying amount	378,586
2023 Notes
Debt Instrument [Line Items]
Principal	230,000		$ 230,000
Unamortized debt discount	(30,425)		(40,768)
Unamortized issuance costs	(3,009)		(4,032)	$ (6,900)
Net carrying amount	196,566		$ 185,200
2025 Notes
Debt Instrument [Line Items]
Principal	230,000
Unamortized debt discount	(42,930)
Unamortized issuance costs	(5,050)	$ (7,200)
Net carrying amount	$ 182,020