Commitments and Contingencies - Additional Information (Details)	3 Months Ended		6 Months Ended		12 Months Ended	100 Months Ended
	Jun. 30, 2020 USD ($) ft² numberOfEmployees	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) ft² numberOfEmployees	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) numberOfEmployees	Jun. 30, 2020 USD ($) ft² numberOfEmployees	Sep. 30, 2017 USD ($) numberOfEmployees	Feb. 28, 2017 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2012 USD ($)
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 1,900,000	$ 1,800,000	$ 4,000,000.0	$ 3,800,000
Grants receivable										$ 16,500,000
Number of employees to be hired per incentive grant agreement | numberOfEmployees							900
Minimum cumulative employee compensation, recapture period one							$ 108,000,000.0
Minimum cumulative employee compensation, recapture period three							324,000,000.0
Cumulative compensation expense incurred	135,100,000		135,100,000		$ 120,100,000	$ 135,100,000
Proceeds from government grants						12,000,000.0
Grant agreement, maximum possible repayment amount, recapture period two							2,600,000
Grant agreement, maximum possible repayment amount, recapture period three							$ 2,500,000
Grant agreement, recapture provision repayments	1,500,000		1,500,000			1,500,000
Delaware grant obligation	10,469,000		10,469,000		10,469,000	10,469,000
Managed services liabilities	$ (440,400,000)		(440,400,000)		(446,200,000)	$ (440,400,000)
PPA II | PPA Entities
Operating Leased Assets [Line Items]
Increase (decrease) in restricted cash			$ 108,700,000
PPA IIIb | PPA Entities
Operating Leased Assets [Line Items]
Cash and cash equivalents, period increase (decrease)					$ 20,000,000.0
United States, India, South Korea, China and Taiwan
Operating Leased Assets [Line Items]
Area of real estate property | ft²	370,601		370,601			370,601
Delaware
Operating Leased Assets [Line Items]
Number of full time employees | numberOfEmployees	380		380		323	380
PPA V
Operating Leased Assets [Line Items]
PPA expenses			$ 5,700,000		$ 3,500,000
Term loan | PPA V | Term Loan due December 2021, Non-Recourse
Operating Leased Assets [Line Items]
Debt face amount									$ 131,200,000
Letters of Credit | PPA V
Operating Leased Assets [Line Items]
Maximum borrowing capacity								$ 6,200,000	$ 6,400,000
Amount outstanding	$ 5,200,000		$ 5,200,000		$ 5,000,000.0	$ 5,200,000