Outstanding Loans and Security Agreements - Recourse Debt Facilities (Additional Information) (Details)			1 Months Ended	3 Months Ended
		May 01, 2020 USD ($)	Aug. 31, 2020 USD ($) $ / shares	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Long-term debt, gross				$ 522,191,000			$ 527,054,000
Interest expense				14,700,000	$ 22,100,000
Retained earnings (accumulated deficit)				3,123,518,000			3,103,937,000
Additional paid in capital				(3,129,687,000)			(3,182,753,000)
Non-recourse long term debt, non-current	[1]			99,941,000			$ 102,045,000
Contractual interest expense				$ 14,731,000	$ 20,754,000
10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Interest rate percentage		10.25%
Redemption price, percentage				101.00%
Convertible debt | Convertible Promissory Notes Interest Rate 10% Due December 2021
Debt Instrument [Line Items]
Repayments of convertible debt		$ 70,000,000.0
Convertible debt | 10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Maximum borrowing capacity		150,000,000.0
Current borrowing capacity		80,000,000.0
Notes | 10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Interest rate percentage				10.25%			10.25%
Debt face amount		70,000,000.0
Long-term debt, gross				$ 70,000,000			$ 70,000,000
Secured long-term debt, noncurrent		$ 70,000,000.0
Senior secured notes | 2.5% Green Convertible Senior Notes due August 2025
Debt Instrument [Line Items]
Interest rate percentage			2.50%				2.50%
Long-term debt, gross			$ 230,000,000.0	$ 230,000,000			$ 230,000,000
Debt instrument, unamortized discount			6,900,000
Convertible, conversion ratio				0.0616808
Debt other issuance costs, net			3,000,000.0
Proceeds from debt, net of issuance costs			220,100,000
Debt instrument, term				4 years 4 months 24 days
Contractual interest expense			1,200,000
Amortization of debt issuance costs			$ 500,000
Senior secured notes | 2.5% Green Convertible Senior Notes due August 2025 | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Retained earnings (accumulated deficit)						$ 5,300,000
Additional paid in capital						126,800,000
Non-recourse long term debt, non-current						$ 121,500,000
Affiliated entity | Convertible debt | Convertible Promissory Notes Interest Rate 10% Due December 2021
Debt Instrument [Line Items]
Interest rate percentage					10.00%
Class A common stock | Senior secured notes | 2.5% Green Convertible Senior Notes due August 2025
Debt Instrument [Line Items]
Convertible stock price (in dollars per share) | $ / shares			$ 16.21
On or after March 27, 2022 | 10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Redemption price, percentage				108.00%
On or after March 27, 2023 | 10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Redemption price, percentage				104.00%
On or after March 27, 2024 | 10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Redemption price, percentage				102.00%
On or after March 27, 2026 | 10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Redemption price, percentage				100.00%

[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).