Commitments and Contingencies - Narrative (Details) $ in Thousands			12 Months Ended			109 Months Ended
		Jan. 10, 2022 USD ($)	Dec. 31, 2021 USD ($) employee	Dec. 31, 2020 USD ($) employee	Dec. 31, 2019 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2018 employee	Jun. 30, 2018 employee	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Mar. 31, 2012 USD ($)
Operating Leased Assets [Line Items]
Term of customer contract for negotiated rates			15 years
Restricted cash			$ 219,079	$ 169,763
Restricted cash, current	[1]		92,540	52,470
Restricted cash, non-current	[1]		126,539	117,293
Grants receivable											$ 16,500
Number of employees to be hired per incentive grant agreement | employee							900	900
Minimum cumulative employee compensation, recapture period one										$ 108,000
Minimum cumulative employee compensation, recapture period three										$ 324,000
Cumulative compensation expense incurred			191,400	152,200
Proceeds from government grants						$ 12,000
Grant agreement, maximum possible repayment amount, recapture period three			2,500
Grant agreement, recapture provision repayments			1,000						$ 1,500
Delaware grant obligation			$ 9,495	$ 9,212
Subsequent Event
Operating Leased Assets [Line Items]
Settlement amount		$ 1,000
Delaware
Operating Leased Assets [Line Items]
Number of full time employees | employee			484	424
PPA Entities
Operating Leased Assets [Line Items]
Restricted cash, current			$ 3,078	$ 4,698
Restricted cash, non-current			23,239	15,320
PPA Company 2 | PPA Entities
Operating Leased Assets [Line Items]
Restricted cash			99,400
Restricted cash, current			41,700	20,300
Restricted cash, non-current			57,700	88,400
PPA Company 3b | PPA Entities
Operating Leased Assets [Line Items]
Term of customer contract for negotiated rates					7 years
Restricted cash					$ 20,000
Restricted cash, current			1,200	700
Restricted cash, non-current			6,700	13,300
PPA Company 5
Operating Leased Assets [Line Items]
PPA expenses			$ 300	$ 7,400

[1] We have variable interest entities, which represent a portion of the consolidated balances recorded within these financial statement line items in the consolidated balance sheets (see Note 11 - Portfolio Financings).