Commitments and Contingencies - Additional Information (Details)	3 Months Ended		76 Months Ended	97 Months Ended
	Mar. 31, 2020 USD ($) ft² employee	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2020 USD ($) ft² employee	Dec. 31, 2019 USD ($) employee	Jan. 31, 2019 ft²	Feb. 28, 2017 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2012 USD ($) employee
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 2,100,000	$ 2,000,000
Managed services liabilities	443,400,000			$ 443,400,000	$ 446,200,000
Grants receivable									$ 16,500,000
Number of employees to be hired per incentive grant agreement | employee									900
Minimum cumulative employee compensation, recapture period one									$ 108,000,000
Minimum cumulative employee compensation, recapture period three									324,000,000
Cumulative compensation expense incurred	127,800,000			127,800,000	120,100,000
Proceeds from government grants			$ 12,000,000	12,000,000
Grant agreement, maximum possible repayment amount, recapture period two									3,100,000
Grant agreement, maximum possible repayment amount, recapture period three									$ 2,500,000
Grant agreement, recapture provision repayments	1,500,000			1,500,000
Delaware grant obligation	$ 10,469,000			$ 10,469,000	$ 10,469,000
Self-Generation Incentive Program, percentage of incentive issued in the first year	50.00%
Self-Generation Incentive Program, subsequent payment period	5 years
United States, India, South Korea, China and Taiwan
Operating Leased Assets [Line Items]
Area of real estate property | ft²	281,265			281,265
San Jose, California
Operating Leased Assets [Line Items]
Area of real estate property | ft²						181,000
Delaware
Operating Leased Assets [Line Items]
Number of full time employees | employee	346			346	323
PPA V
Operating Leased Assets [Line Items]
PPA expenses	$ 5,700,000	$ 3,500,000
Term loan | PPA V | LIBOR 2.5% term loan due December 2021
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	5,000,000			$ 5,000,000	$ 5,000,000
PPA II | Variable Interest Entity, Primary Beneficiary
Operating Leased Assets [Line Items]
Increase (decrease) in restricted cash					$ 108,700,000
PPA IIIb | Variable Interest Entity, Primary Beneficiary
Operating Leased Assets [Line Items]
Cash and cash equivalents, period increase (decrease)	$ 20,000,000