Outstanding Loans and Security Agreements - Recourse Debt Facilities Narrative (Details)		1 Months Ended	3 Months Ended
		Aug. 31, 2020 USD ($) $ / shares	Mar. 31, 2022 USD ($) d	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)	Jan. 01, 2021 USD ($)	May 01, 2020 USD ($)	Jul. 01, 2017
Debt Instrument [Line Items]
Long-term debt, current maturities			$ 30,291,000		$ 25,831,000
Unpaid Principal Balance			534,895,000		539,669,000
Accumulated deficit			(3,341,434,000)		(3,263,075,000)
Decrease in additional paid-in capital			3,251,128,000		3,219,081,000
Non-recourse debt, non-current	[1]		212,465,000		$ 217,416,000
Contractual interest expense			$ 14,087,000	$ 14,731,000
10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Interest rate percentage							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 | Notes
Debt Instrument [Line Items]
Interest rate percentage			10.25%		10.25%
Debt face amount							$ 70,000,000
Secured long-term debt, noncurrent			$ 57,600,000
Long-term debt, current maturities			12,355,000		$ 8,348,000
Unpaid Principal Balance			$ 70,000,000		$ 70,000,000
10.25% Senior Secured Notes due March 2027 | Convertible debt
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 70,000,000
Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse | Convertible debt | Affiliated entity
Debt Instrument [Line Items]
Interest rate percentage								6.00%
2.5% Green Convertible Senior Notes due August 2025 | Senior Secured Notes
Debt Instrument [Line Items]
Interest rate percentage		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
Threshold trading day | d			26
Contractual interest expense			$ 1,900,000
Amortization of debt issuance costs			$ 500,000
2.5% Green Convertible Senior Notes due August 2025 | Senior Secured Notes | Minimum
Debt Instrument [Line Items]
Threshold consecutive trading days | d			20
2.5% Green Convertible Senior Notes due August 2025 | Senior Secured Notes | Maximum
Debt Instrument [Line Items]
Threshold consecutive trading days | d			30
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 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 condensed consolidated balance sheets (see Note 11 - Portfolio Financings).