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Debt - Carrying Amount of Liability Component (Details) - Convertible Debt - USD ($) $ in Thousands	Sep. 30, 2020	May 01, 2020	Dec. 31, 2019	Aug. 31, 2018
Debt Instrument [Line Items]
Principal	$ 460,000
Unamortized debt discount	(78,113)
Unamortized issuance costs	(8,569)
Net carrying amount	373,318
2023 Notes
Debt Instrument [Line Items]
Principal	230,000		$ 230,000
Unamortized debt discount	(33,101)		(40,768)
Unamortized issuance costs	(3,274)		(4,032)	$ (6,900)
Net carrying amount	193,625		$ 185,200
2025 Notes
Debt Instrument [Line Items]
Principal	230,000
Unamortized debt discount	(45,012)
Unamortized issuance costs	(5,295)	$ (7,200)
Net carrying amount	$ 179,693