Outstanding Loans and Security Agreements - Recourse Debt Facilities (Additional Information) (Details)	1 Months Ended			12 Months Ended	19 Months Ended
	Nov. 30, 2019 shares	Jul. 31, 2018 USD ($) shares	May 31, 2013 USD ($)	Dec. 31, 2019 USD ($) day $ / shares	Jun. 30, 2016 USD ($)	Dec. 31, 2018 USD ($)	Jan. 18, 2018	Jul. 01, 2017 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 10, 2016 USD ($)	Jan. 29, 2016 USD ($)	Dec. 15, 2015 USD ($) $ / shares	Dec. 31, 2014
Debt Instrument [Line Items]
Long-term debt carrying value				$ 636,812,000		$ 741,281,000
Interest rate percentage				6.00%
Unpaid principal balance				$ 658,083,000		786,495,000
Long-term portion of debt				299,229,000		711,433,000
Indebtedness in excess of				300,000
Current portion of debt				337,583,000		29,848,000
Credit facility | Term Loan due November 2020, Recourse
Debt Instrument [Line Items]
Debt face amount			$ 5,000,000.0							$ 5,000,000.0
Term loan | Term Loan due December 2021, Non-Recourse
Debt Instrument [Line Items]
Long-term debt carrying value				120,437,000		123,384,000
Unpaid principal balance				121,784,000		125,456,000
Long-term portion of debt				115,315,000		119,712,000
Current portion of debt				$ 5,122,000		$ 3,672,000
Term loan | Term Loan due November 2020, Recourse
Debt Instrument [Line Items]
Debt face amount			$ 12,000,000
Debt term			90 months
Weighted average interest rate (as a percentage)				6.30%		5.90%
Long-term debt carrying value				$ 1,536,000		$ 3,214,000
Unpaid principal balance				1,571,000		3,286,000
Long-term portion of debt				0		1,528,000
Indebtedness in excess of				100,000
Current portion of debt				$ 1,536,000		1,686,000
Convertible promissory notes | Convertible Promissory Notes due December 2019 and 2020, Recourse
Debt Instrument [Line Items]
Interest rate percentage				5.00%
Unpaid principal balance		$ 221,600,000
Convertible promissory notes | Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse
Debt Instrument [Line Items]
Long-term debt carrying value				$ 36,482,000
Interest rate percentage				5.00%
Unpaid principal balance				$ 33,104,000
Long-term portion of debt				0
Current portion of debt				$ 36,482,000
Convertible promissory notes | Convertible Promissory Notes Interest Rate 8% Due December 2019
Debt Instrument [Line Items]
Debt term					3 years
Long-term debt carrying value						34,706,000
Interest rate percentage				8.00%
Unpaid principal balance						33,104,000
Long-term portion of debt						34,706,000
Current portion of debt						0
Convertible promissory notes | Convertible Promissory Notes due December 2020, Recourse
Debt Instrument [Line Items]
Debt face amount											$ 260,000,000	$ 75,000,000	$ 25,000,000	$ 160,000,000
Interest rate percentage				6.00%
Convertible stock price (in dollars per share) | $ / shares				$ 20.61										$ 11.25
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Debt face amount												$ 260,000,000
Long-term debt carrying value				$ 273,410,000		263,284,000
Interest rate percentage				6.00%
Convertible stock price (in dollars per share) | $ / shares				$ 11.25
Unpaid principal balance				$ 289,299,000		296,233,000
Debt conversion, shares issued (in shares) | shares	616,302
Long-term portion of debt				0		263,284,000
Current portion of debt				273,410,000		0
Notes | Notes due July 2024, Recourse
Debt Instrument [Line Items]
Debt face amount									$ 100,000,000
Long-term debt carrying value				$ 89,962,000		95,555,000
Interest rate percentage				10.00%
Unpaid principal balance				$ 93,000,000		100,000,000
Long-term portion of debt				75,962,000		88,555,000
Current portion of debt				14,000,000		7,000,000
Affiliated entity
Debt Instrument [Line Items]
Long-term debt carrying value				55,771,000		64,053,000
Unpaid principal balance				59,138,000		68,272,000
Long-term portion of debt				31,088,000		61,853,000
Current portion of debt				$ 24,683,000		2,200,000
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes due December 2019 and 2020, Recourse
Debt Instrument [Line Items]
Debt face amount					$ 193,200,000.0
Interest rate percentage				8.00%			8.00%								8.00%
Convertible stock price (in dollars per share) | $ / shares				$ 38.64
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes due December 2020, Recourse
Debt Instrument [Line Items]
Interest rate percentage								6.00%			5.00%
Percentage of debt outstanding to maintain as collateral								200.00%
Holders of debt, percentage subject to cross-acceleration provision								25.00%
Indebtedness in excess of								$ 15,000,000.0
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Long-term debt carrying value				$ 20,801,000		27,734,000
Unpaid principal balance				20,801,000		27,734,000
Long-term portion of debt				0		27,734,000
Current portion of debt				$ 20,801,000		$ 0
Class B common stock
Debt Instrument [Line Items]
Debt conversion, shares issued (in shares) | shares		5,734,440
On or after July 27, 2020 | Affiliated entity | Convertible promissory notes | Convertible Promissory Notes due December 2020, Recourse
Debt Instrument [Line Items]
Last reported sale price of common stock (at least) (in dollars per share) | $ / shares				$ 22.50
Trading days (at least) | day				20
Period of consecutive trading days | day				30
Trading days immediately preceding redemption date | day				3
LIBOR | Term loan | Term Loan due December 2021, Non-Recourse
Debt Instrument [Line Items]
LIBOR margin (as a percentage)				2.50%
LIBOR | Term loan | Term Loan due November 2020, Recourse
Debt Instrument [Line Items]
LIBOR margin (as a percentage)				4.00%
LIBOR | Affiliated entity | Term Loan due December 2021, Non-Recourse
Debt Instrument [Line Items]
LIBOR margin (as a percentage)				2.50%
LIBOR | Affiliated entity | Term Loan due November 2020, Recourse
Debt Instrument [Line Items]
LIBOR margin (as a percentage)				4.00%