Outstanding Loans and Security Agreements - Recourse Debt Facilities (Additional Information) (Details) - USD ($)			1 Months Ended			3 Months Ended		19 Months Ended
	May 01, 2020	Mar. 31, 2020	Nov. 30, 2019	Jul. 31, 2018	May 31, 2013	Mar. 31, 2020	Mar. 31, 2019	Jun. 30, 2016	Apr. 01, 2020	Dec. 31, 2019	Jan. 18, 2018	Jul. 01, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Sep. 10, 2016	Dec. 31, 2014
Debt Instrument [Line Items]
Indebtedness in excess of		$ 300,000				$ 300,000
Unpaid Principal Balance		680,687,000				680,687,000				$ 658,083,000
Long-term debt		696,001,000				696,001,000				636,812,000
Loss on extinguishment of debt						14,098,000	$ 0
Current portion of debt		26,226,000				26,226,000				337,583,000
Long-term portion of debt		$ 669,775,000				$ 669,775,000				$ 299,229,000
Credit facility | LIBOR 4% term loan due November 2020
Debt Instrument [Line Items]
Debt face amount					$ 5,000,000.0									$ 5,000,000.0
Term loan | LIBOR 4% term loan due November 2020
Debt Instrument [Line Items]
Debt face amount					$ 12,000,000
Debt term					90 months
Weighted average interest rate (as a percentage)		5.70%				5.70%				6.30%
Indebtedness in excess of		$ 100,000				$ 100,000
Unpaid Principal Balance		1,143,000				1,143,000				$ 1,571,000
Long-term debt		1,117,000				1,117,000				1,536,000
Current portion of debt		1,117,000				1,117,000				1,536,000
Long-term portion of debt		$ 0				$ 0				0
Convertible promissory notes | 8% Convertible Promissory Notes
Debt Instrument [Line Items]
Debt term								3 years
Unpaid Principal Balance				$ 221,600,000
Interest rate percentage		10.00%				10.00%
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%
Write off of deferred debt issuance cost						$ 3,800,000
Long-term debt										$ 36,482,000
Current portion of debt										36,482,000
Long-term portion of debt										$ 0
Convertible promissory notes | 10% convertible promissory Constellation notes due December 2021
Debt Instrument [Line Items]
Unpaid Principal Balance		$ 36,940,000				$ 36,940,000
Interest rate percentage		10.00%				10.00%
Covenant, interest coverage ratio, minimum		18.00%				18.00%
Long-term debt		$ 40,709,000				$ 40,709,000
Current portion of debt		0				0
Long-term portion of debt		40,709,000				40,709,000
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Debt face amount																$ 260,000,000
Unpaid Principal Balance		289,299,000				289,299,000
Interest rate percentage										6.00%
Convertible stock price (in dollars per share)			$ 11.25
Long-term debt										$ 273,410,000
Debt conversion, shares issued (in 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]
Debt face amount		290,000,000				290,000,000
Unpaid Principal Balance		$ 319,299,000				$ 319,299,000
Interest rate percentage		10.00%				10.00%
Convertible stock price (in dollars per share)		$ 8.00				$ 8.00
Long-term debt		$ 338,944,000				$ 338,944,000
Current portion of debt		0				0
Long-term portion of debt		338,944,000				338,944,000
Convertible debt | Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse
Debt Instrument [Line Items]
Extinguishment of debt, amount		33,100,000
Long-term debt, fair value		40,700,000				40,700,000
Write off of deferred debt issuance cost		3,800,000
Convertible debt | 10% convertible promissory Constellation notes due December 2021
Debt Instrument [Line Items]
Debt face amount		36,900,000				36,900,000
Unamortized premium		3,800,000				3,800,000
Convertible debt | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Debt face amount		289,300,000				289,300,000
Unamortized uiscount		10,700,000				10,700,000
Unamortized debt issuance costs		1,000,000				1,000,000
Accrued and unpaid interest		1,400,000				1,400,000
Payments of debt issuance costs						1,200,000
Long-term debt, fair value		340,700,000				340,700,000
Long-term debt		279,000,000				279,000,000
Loss on extinguishment of debt						10,300,000
Convertible debt | Additional Convertible Notes
Debt Instrument [Line Items]
Debt face amount		30,000,000				30,000,000
Convertible debt | 10% convertible promissory notes due December 2021
Debt Instrument [Line Items]
Debt face amount		319,300,000				319,300,000
Debt issuance costs, noncurrent		1,800,000				1,800,000
Long-term debt		338,900,000				338,900,000
Unamortized premium		21,400,000				21,400,000
Notes | Notes due July 2024, Recourse
Debt Instrument [Line Items]
Debt face amount													$ 100,000,000
Unpaid Principal Balance		$ 86,000,000				$ 86,000,000				$ 93,000,000
Interest rate percentage		10.00%				10.00%				10.00%
Long-term debt		$ 83,230,000				$ 83,230,000				$ 89,962,000
Current portion of debt		14,000,000				14,000,000				14,000,000
Long-term portion of debt		69,230,000				69,230,000				75,962,000
Affiliated entity
Debt Instrument [Line Items]
Unpaid Principal Balance		87,033,000				87,033,000				59,138,000
Long-term debt		85,822,000				85,822,000				55,771,000
Current portion of debt		2,439,000				2,439,000				24,683,000
Long-term portion of debt		$ 83,383,000				$ 83,383,000				31,088,000
Affiliated entity | Convertible promissory notes | 8% Convertible Promissory Notes
Debt Instrument [Line Items]
Debt face amount								$ 193,200,000.0
Interest rate percentage																	8.00%
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes Interest Rate 5% Due December 2020, Recourse
Debt Instrument [Line Items]
Convertible stock price (in dollars per share)		$ 38.64				$ 38.64
Affiliated entity | Convertible promissory notes | 10% convertible promissory Constellation notes due December 2021
Debt Instrument [Line Items]
Convertible stock price (in dollars per share)									$ 8.00
Affiliated entity | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Unpaid Principal Balance										20,801,000
Interest rate percentage												6.00%			5.00%
Long-term debt										20,801,000
Fair value of embedded derivative		$ 24,000,000		$ 178,000,000		$ 24,000,000
Current portion of debt										20,801,000
Long-term portion of debt										$ 0
Affiliated entity | Convertible promissory notes | 10% convertible promissory notes due December 2021
Debt Instrument [Line Items]
Unpaid Principal Balance		$ 50,801,000				$ 50,801,000
Interest rate percentage		10.00%				10.00%
Long-term debt		$ 52,786,000				$ 52,786,000
Covenant, proceeds used for certain transactions		50.00%				50.00%
Redemption price, percentage of principal amount redeemed						100.00%
Current portion of debt		$ 0				$ 0
Long-term portion of debt		$ 52,786,000				$ 52,786,000
Class B common stock
Debt Instrument [Line Items]
Debt conversion, shares issued (in shares)				5,734,440
LIBOR | LIBOR 4% term loan due November 2020
Debt Instrument [Line Items]
LIBOR margin (as a percentage)						4.00%
LIBOR | Term loan | LIBOR 4% term loan due November 2020
Debt Instrument [Line Items]
LIBOR margin (as a percentage)						4.00%
Subsequent Event | Convertible debt | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse
Debt Instrument [Line Items]
Repayments of convertible debt	$ 70,000,000
Subsequent Event | Convertible debt | 10% convertible promissory notes due December 2021
Debt Instrument [Line Items]
Repayments of convertible debt	$ 70,000,000
New Enterprise Associates 10, Limited Partnership | Convertible debt | Additional Convertible Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt						$ 20,000,000
Foris Ventures LLC | Convertible debt | Additional Convertible Notes
Debt Instrument [Line Items]
Proceeds from issuance of debt						$ 10,000,000