Summary of Significant Accounting Policies - (Additional Information) (Details) - USD ($) $ in Thousands		3 Months Ended	9 Months Ended
		Sep. 30, 2021	Sep. 30, 2021	Jan. 01, 2021	Dec. 31, 2020	Aug. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill		$ 1,719	$ 1,719		$ 0
Accumulated deficit		(3,229,752)	(3,229,752)		(3,103,937)
Decrease in additional paid-in capital		3,183,101	3,183,101		3,182,753
Non-recourse long term debt, non-current	[1]	205,164	205,164		$ 102,045
Revenue related to sales-type leases		3,900
Operating lease, lease income		2,200
Equity Method Investee
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Goodwill		$ 1,700	$ 1,700
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of PPA			10 years
Term during which the Company is responsible for the installation, operation and maintenance of the Energy Servers			10 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term of PPA			21 years
Term during which the Company is responsible for the installation, operation and maintenance of the Energy Servers			15 years
2.5% Green Convertible Senior Notes due August 2025 | Senior secured notes
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Interest rate percentage		2.50%	2.50%		2.50%	2.50%
2.5% Green Convertible Senior Notes due August 2025 | Senior secured notes | Accounting Standards Update 2020-06
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit				$ 5,300
Decrease in additional paid-in capital				126,800
Non-recourse long term debt, non-current				$ 121,500

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