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Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) segment $ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2020 USD ($)	Sep. 30, 2019
Debt Instrument [Line Items]
Number of operating segments \| segment	1
Impairment losses of long lived assets	$ 0	$ 0	$ 0
Recognized impairments on investments	$ 0	0	$ 0
Warrants exercise price (in dollars per share) \| $ / shares	$ 0.05
Additional paid-in capital	$ 1,136,656,000	1,103,074,000
Accumulated deficit	$ (1,153,911,000)	$ (1,079,101,000)
Cumulative Effect, Period of Adoption, Adjustment \| Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Additional paid-in capital				$ (124,700,000)
Convertible debt				76,700,000
Accumulated deficit				$ 48,000,000
Convertible Senior Notes Due 2024 \| Convertible debt
Debt Instrument [Line Items]
Debt instrument, interest rate percentage					1.50%