Summary of Significant Accounting Policies - Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Outstanding principle	$ 287,500
Net carrying amount	280,394
Accumulated deficit	(1,394,836)	$ (929,318)
Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest expense	7,696
Outstanding principle	287,500
Previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest expense	$ 9,400
Previously reported | Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Outstanding principle		287,500
Unamortized debt discount and issuance cost		(85,007)
Net carrying amount		202,493
Additional paid-in-capital		(1,411,286)
Accumulated deficit		(929,318)
Adoption Adjustment | Cumulative effect adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit		404
Accounting Standards Update 2020-06 | Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Outstanding principle		287,500
Unamortized debt discount and issuance cost		(8,333)
Net carrying amount		279,167
Additional paid-in-capital		(1,328,410)
Accumulated deficit		(923,120)
Accounting Standards Update 2020-06 | Adoption Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction in net loss from continuing operations per share	$ 0.10
Accounting Standards Update 2020-06 | Adoption Adjustment | Convertible Notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unamortized debt discount and issuance cost		76,674
Net carrying amount		76,674
Additional paid-in-capital		82,876
Accumulated deficit		$ 6,198