Outstanding Loans and Security Agreements - Recourse Debt Facilities Narrative (Details)		1 Months Ended	12 Months Ended
		Aug. 31, 2020 USD ($) $ / shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jan. 01, 2021 USD ($)	May 01, 2020 USD ($)	Jul. 01, 2017
Debt Instrument [Line Items]
Long-term debt, current maturities			$ 25,831,000	$ 120,846,000
Unpaid Principal Balance			539,669,000	527,054,000
Accumulated deficit			(3,263,075,000)	(3,103,937,000)
Decrease in additional paid-in capital			3,219,081,000	3,182,753,000
Non-recourse long term debt, non-current	[1]		217,416,000	102,045,000
Contractual interest expense			$ 69,025,000	$ 76,276,000	$ 87,480,000
10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Interest Rate							10.25%
Redemption price, percentage			101.00%
10.25% Senior Secured Notes due March 2027 | On or after March 27, 2022
Debt Instrument [Line Items]
Redemption price, percentage			108.00%
10.25% Senior Secured Notes due March 2027 | On or after March 27, 2023
Debt Instrument [Line Items]
Redemption price, percentage			104.00%
10.25% Senior Secured Notes due March 2027 | On or after March 27, 2024
Debt Instrument [Line Items]
Redemption price, percentage			102.00%
10.25% Senior Secured Notes due March 2027 | On or after March 27, 2026
Debt Instrument [Line Items]
Redemption price, percentage			100.00%
10.25% Senior Secured Notes due March 2027 | Convertible debt
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 150,000,000
Current borrowing capacity							80,000,000
10.25% Senior Secured Notes due March 2027 | Notes
Debt Instrument [Line Items]
Interest Rate			10.25%	10.25%
Debt face amount							$ 70,000,000
Secured long-term debt, noncurrent			$ 61,700,000
Long-term debt, current maturities			8,348,000	$ 0
Unpaid Principal Balance			$ 70,000,000	$ 70,000,000
Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse | Convertible debt | Affiliated entity
Debt Instrument [Line Items]
Interest Rate								6.00%
2.5% Green Convertible Senior Notes due August 2025 | Senior secured notes
Debt Instrument [Line Items]
Interest Rate		2.50%	2.50%	2.50%
Long-term debt, current maturities			$ 0	$ 0
Unpaid Principal Balance		$ 230,000,000	$ 230,000,000	230,000,000
Debt instrument, unamortized discount		6,900,000
Debt other issuance costs, net		3,000,000
Proceeds from debt, net of issuance costs		$ 220,100,000
Convertible, conversion ratio			0.0616808
Contractual interest expense			$ 7,700,000	2,900,000
Amortization of debt issuance costs			$ 2,000,000	$ 800,000
2.5% Green Convertible Senior Notes due August 2025 | Senior secured notes | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Accumulated deficit						$ 5,300,000
Decrease in additional paid-in capital						126,800,000
Non-recourse long term debt, non-current						$ 121,500,000
2.5% Green Convertible Senior Notes due August 2025 | Senior secured notes | Class A common stock
Debt Instrument [Line Items]
Convertible stock price (in dollars per share) | $ / shares		$ 16.21

[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).