Summary of Significant Accounting Policies - (Additional Information) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Aug. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings (accumulated deficit)		$ 3,123,518		$ 3,103,937
Additional paid in capital		(3,129,687)		(3,182,753)
Non-recourse long term debt, non-current	[1]	$ 99,941		$ 102,045
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%
2.5% 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]
Retained earnings (accumulated deficit)			$ 5,300
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).