Outstanding Loans and Security Agreements - Recourse Debt Facilities (Additional Information) (Details)				1 Months Ended			3 Months Ended	12 Months Ended
	Jun. 18, 2020 USD ($) shares $ / shares	May 01, 2020 USD ($)	Mar. 31, 2020 USD ($) $ / shares	Oct. 31, 2020 USD ($) shares	Aug. 31, 2020 USD ($) $ / shares shares	Nov. 30, 2019 $ / shares shares	Mar. 31, 2020 USD ($) $ / shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 30, 2020 $ / shares	Jul. 01, 2017
Debt Instrument [Line Items]
Unpaid Principal Balance								$ 527,054,000	$ 658,083,000
Long-term debt carrying value								390,899,000	636,812,000
Loss on extinguishment of debt								12,878,000	0	$ 0
Payments of debt issuance costs								13,247,000	0	0
Current portion of debt								120,846,000	337,583,000
Long-term portion of debt								270,053,000	299,229,000
Interest expense								78,800,000	94,200,000	105,900,000
Contractual interest expense								$ 76,276,000	$ 87,480,000	$ 97,021,000
10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Interest rate percentage		10.25%
Redemption price, percentage								101.00%
Term loan | Term Loan due November 2020, Recourse
Debt Instrument [Line Items]
Weighted average interest rate (as a percentage)									6.30%
Unpaid Principal Balance								$ 0	$ 1,571,000
Interest rate percentage								4.00%	4.00%
Long-term debt carrying value									$ 1,536,000
Current portion of debt									1,536,000
Long-term portion of debt									0
Term loan | Term Loan due November 2020, Recourse | LIBOR
Debt Instrument [Line Items]
LIBOR margin (as a percentage)								4.00%
Term loan | Term Loan due December 2021, Non-Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance								$ 114,761,000	$ 121,784,000
Interest rate percentage								2.50%	2.50%
Long-term debt carrying value								$ 114,138,000	$ 120,437,000
Current portion of debt								114,138,000	5,122,000
Long-term portion of debt								$ 0	115,315,000
Convertible promissory notes | Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance									$ 33,104,000
Interest rate percentage								5.00%	5.00%		5.00%
Debt make-whole expense							$ 3,800,000
Long-term debt carrying value									$ 36,482,000
Current portion of debt									36,482,000
Long-term portion of debt									0
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance									$ 289,299,000
Interest rate percentage								10.00%	6.00%
Convertible stock price (in dollars per share) | $ / shares						$ 11.25
Long-term debt carrying value									$ 273,410,000
Debt conversion, shares issued (in shares) | shares						616,302
Current portion of debt									273,410,000
Long-term portion of debt									$ 0
Convertible promissory notes | 10% Convertible Promissory Notes due December 2021
Debt Instrument [Line Items]
Interest rate percentage			10.00%				10.00%	10.00%	10.00%	10.00%
Convertible promissory notes | Convertible Promissory Notes Interest Rate 10% Due December 2021
Debt Instrument [Line Items]
Convertible stock price (in dollars per share) | $ / shares			$ 8.00				$ 8.00
Converted instrument, amount								$ 252,797,000	$ 0	$ 0
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse, Amendment
Debt Instrument [Line Items]
Convertible, number of equity instruments (in shares) | shares	4,700,000
Debt instrument, unamortized premium	$ 3,400,000
Convertible debt | Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse
Debt Instrument [Line Items]
Extinguishment of debt amount			$ 33,100,000
Debt make-whole expense			3,800,000
Long-term debt, fair value			40,700,000				$ 40,700,000
Convertible debt | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Long-term debt, fair value			340,700,000				340,700,000
Debt instrument, unamortized premium		$ 4,300,000
Long-term debt carrying value			279,000,000.0				279,000,000.0
Debt face amount			289,300,000				289,300,000
Loss on extinguishment of debt							10,300,000
Accrued and unpaid interest			1,400,000				1,400,000
Debt issuance costs, net			1,000,000.0				1,000,000.0
Payments of debt issuance costs							1,200,000
Repayments of convertible debt		70,000,000.0
Debt instrument, unamortized discount			10,700,000				10,700,000
Convertible debt | Additional Convertible Notes
Debt Instrument [Line Items]
Debt face amount			30,000,000.0				30,000,000.0
Convertible debt | Convertible Promissory Notes Interest Rate 10% Due December 2021
Debt Instrument [Line Items]
Repayments of convertible debt		70,000,000.0
Maximum borrowing capacity		150,000,000.0
Current borrowing capacity		80,000,000.0
Notes | 10% Senior Secured notes due July 2024
Debt Instrument [Line Items]
Unpaid Principal Balance									$ 93,000,000
Interest rate percentage								10.00%	10.00%
Debt instrument, unamortized premium								$ 3,200,000
Long-term debt carrying value									$ 89,962,000
Accrued and unpaid interest								2,100,000
Debt issuance costs, net								2,000,000.0
Current portion of debt								$ 79,000,000.0	14,000,000
Premium percentage								0.04
Redemption price, percentage of principal amount redeemed								104.00%
Long-term portion of debt									$ 75,962,000
Notes | 10.25% Senior Secured Notes due March 2027
Debt Instrument [Line Items]
Unpaid Principal Balance								$ 70,000,000.0
Interest rate percentage								10.25%	10.25%
Long-term debt carrying value								$ 68,614,000
Debt face amount		$ 70,000,000.0
Current portion of debt								0
Long-term portion of debt								68,614,000
Senior secured notes | 2.5% Green Convertible Senior Notes due August 2025
Debt Instrument [Line Items]
Unpaid Principal Balance					$ 230,000,000.0			$ 230,000,000
Interest rate percentage					2.50%			2.50%	2.50%
Long-term debt carrying value								$ 99,394,000
Debt issuance costs, net					$ 9,900,000
Current portion of debt								0
Long-term portion of debt								$ 99,394,000
Debt instrument, unamortized discount					6,900,000
Debt other issuance costs, net					3,000,000.0
Proceeds from debt, net of issuance costs					220,100,000
Convertible, conversion ratio								0.0616808
Debt issuance costs, attributable to liability component, net					4,200,000
Debt issuance costs, attributable to equity component, net					5,700,000
Convertible, carrying amount of liability component					93,300,000
Convertible, carrying amount of equity component					138,100,000
Interest expense								$ 8,300,000
Amortization of debt discount (premium)					5,900,000
Amortization of debt issuance costs					200,000
Interest rate percentage, attributable to liability component								0.219
Debt instrument, term								4 years 8 months 12 days
Contractual interest expense					$ 2,200,000
Affiliated entity
Debt Instrument [Line Items]
Unpaid Principal Balance								$ 59,138,000
Long-term debt carrying value								55,771,000
Current portion of debt								24,683,000
Long-term portion of debt								31,088,000
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Interest rate percentage												6.00%
Embedded derivative, fair value, net			$ 24,000,000.0				$ 24,000,000.0
Affiliated entity | Convertible promissory notes | 10% Convertible Promissory Notes due December 2021
Debt Instrument [Line Items]
Convertible stock price (in dollars per share) | $ / shares	$ 8.00		$ 8.00				$ 8.00				$ 38.64
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes Interest Rate 10% Due December 2021
Debt Instrument [Line Items]
Interest rate percentage			10.00%				10.00%
Affiliated entity | Convertible debt | Convertible Promissory Notes Interest Rate 10% Due December 2021
Debt Instrument [Line Items]
Unpaid Principal Balance				$ 96,200,000
Interest rate percentage			10.00%				10.00%
Debt instrument, unamortized premium				$ 3,200,000
Converted instrument, amount								$ 153,100,000
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
Class A common stock | Affiliated entity | Convertible debt | Convertible Promissory Notes Interest Rate 10% Due December 2021
Debt Instrument [Line Items]
Conversion of notes (in shares) | shares				12,000,000.0
Class B common stock | Convertible promissory notes | Convertible Promissory Notes Interest Rate 10% Due December 2021
Debt Instrument [Line Items]
Conversion of notes (in shares) | shares								19,100,000
Class B common stock | Foris Ventures LLC
Debt Instrument [Line Items]
Converted instrument, amount					$ 10,000,000.0
Conversion of notes (in shares) | shares					1,300,000
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%