Debt - Narrative (Details)								1 Months Ended					3 Months Ended				6 Months Ended		19 Months Ended
	May 28, 2020 USD ($) $ / shares	Apr. 06, 2020 USD ($) $ / shares shares	Oct. 31, 2019 USD ($) $ / shares	Sep. 18, 2019 USD ($)	Dec. 21, 2018 USD ($)	Dec. 13, 2018 USD ($) loan	Apr. 27, 2018 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Nov. 30, 2019 USD ($)	Apr. 30, 2019 USD ($)	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jun. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) $ / shares shares	Jul. 20, 2020 $ / shares shares	May 15, 2020	Dec. 22, 2014 USD ($)	Dec. 16, 2014 USD ($)
Debt Instrument [Line Items]
Stated interest rate																					1.00%
Non cash interest expense																	$ 6,171,000	$ 4,228,000
Partial extinguishment of equity component																	(7,600,000)
Partial extinguishment of Convertible 3.75% Senior Notes													$ 0			$ 0	0	185,000
Proceeds from Revolver																	0	$ 10,000,000
Reverse stock split, conversion ratio	0.10
Derivative liability	$ 6,300,000												5,600,000				5,600,000		$ 5,600,000
Remeasured derivative liability								$ 6,776,000					5,571,000		$ 6,776,000		5,571,000		$ 5,571,000
Mark-to-market loss recognized													$ 3,500,000				$ 3,500,000
Pre-reverse stock split shares (in shares) | shares		538,995
Exercise price (dollars per share) | $ / shares		$ 0.01
Estimated fair value of the Warrants	2,200,000	$ 1,400,000
Period warrants are exercisable		5 years
Warrants outstanding (in shares) | shares													538,995				538,995		538,995
Subsequent Event
Debt Instrument [Line Items]
Exercise price (dollars per share) | $ / shares																				$ 0.01
Exerciseable warrants (in shares) (up to) | shares																				134,667
Convertible Notes Payable
Debt Instrument [Line Items]
Face amount of the Notes								213,959,000					$ 222,544,000		213,959,000		$ 222,544,000		$ 222,544,000
Carrying value of original debt								186,370,000					195,808,000		186,370,000		195,808,000		195,808,000
2023 Series A Unsecured Convertible Notes for Series B Senior Unsecured Convertible Notes
Debt Instrument [Line Items]
Debt issuance costs													1,400,000				1,400,000		1,400,000
Derivative liability			$ 13,500,000
Remeasured derivative liability														$ 2,800,000
Gain on change in fair value of derivative														$ 4,000,000.0
Loss on restructuring																	900,000
Line of Credit
Debt Instrument [Line Items]
Interest rate, effective percentage		4.25%
Proceeds from Revolver												$ 52,800,000
Liquidity covenant compliance		$ 10,000,000.0
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Face amount of the Notes								25,000,000					25,000,000		25,000,000		25,000,000		25,000,000
Debt issuance costs													300,000				300,000		300,000
Unamortized discount													500,000				500,000		500,000
Proceeds from Revolver				$ 2,500,000		$ 15,000,000.0				$ 5,000,000.0	$ 5,000,000.0
Line of credit maximum borrowing capacity						25,000,000.0							25,000,000.0				$ 25,000,000.0		25,000,000.0
Repayment fee									$ 100,000
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate																	3.75%
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		5.50%
Line of Credit | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		4.50%															2.75%
Line of Credit | Term Loan
Debt Instrument [Line Items]
Face amount of the Notes						$ 80,000,000.0
Debt issuance costs													800,000				$ 800,000		800,000
Unamortized discount													1,800,000				1,800,000		1,800,000
Covenant, revenue required to attain																	$ 125,000,000.0
Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate																	8.75%
Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR) | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%
Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR) | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate		13.00%
Line of Credit | Term Loan | Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		12.00%															7.75%
Qualified Institutional Buyers
Debt Instrument [Line Items]
Face amount of the Notes																						$ 18,750,000	$ 125,000,000.0
Convertible Note 2019
Debt Instrument [Line Items]
Non cash interest expense																	$ 2,500,000
Convertible Note 2019 | Convertible Notes Payable
Debt Instrument [Line Items]
Stated interest rate																						3.75%	3.75%
Debt, transfer							$ 75,100,000
Partial extinguishment of Convertible 3.75% Senior Notes							$ 75,100,000
Convertible Note 2023 | Convertible Notes Payable
Debt Instrument [Line Items]
Stated interest rate							4.75%
Debt, transfer							$ 75,100,000
Conversion price | $ / shares							$ 44.50
Settlement conversion price (dollars per share) | $ / shares							$ 35.60
Debt issuance costs							$ 1,600,000
Unamortized discount							$ 19,000,000.0
Interest rate, effective percentage							11.90%
Senior Notes, due December 2019
Debt Instrument [Line Items]
Partial extinguishment of equity component												2,900,000
Loss on extinguishment of debt												1,700,000			200,000
Senior Notes, due December 2019 | Convertible Notes Payable
Debt Instrument [Line Items]
Gross cash proceeds			$ 29,300,000
Senior Notes, due December 2019 | Convertible Notes Payable
Debt Instrument [Line Items]
Transaction costs												$ 300,000
Repayments of notes								13,000,000.0							2,700,000
2023 Term Loans | Line of Credit | Term Loan
Debt Instrument [Line Items]
Number of term loans | loan						3
Initial Term Loan
Debt Instrument [Line Items]
Paid-in-kind interest option term																	24 months
Increase to principal balance													$ 4,800,000						$ 15,700,000
Initial Term Loan | Minimum
Debt Instrument [Line Items]
Interest rate, effective percentage													16.60%				16.60%		16.60%
Initial Term Loan | Maximum
Debt Instrument [Line Items]
Interest rate, effective percentage													17.70%				17.70%		17.70%
Initial Term Loan | Line of Credit | Term Loan
Debt Instrument [Line Items]
Face amount of the Notes						$ 50,000,000.0
Delayed Draw Term Loan A | Term Loan
Debt Instrument [Line Items]
Debt issuance costs													$ 500,000				$ 500,000		$ 500,000
Proceeds from Revolver								10,000,000.0
Amount drawn					$ 20,000,000.0
Delayed Draw Term Loan A | Term Loan | Minimum
Debt Instrument [Line Items]
Interest rate, effective percentage													9.60%				9.60%		9.60%
Delayed Draw Term Loan A | Term Loan | Maximum
Debt Instrument [Line Items]
Interest rate, effective percentage													10.90%				10.90%		10.90%
Delayed Draw Term Loan A | Line of Credit | Term Loan
Debt Instrument [Line Items]
Face amount of the Notes						30,000,000.0
Delayed Draw Term Loan B | Line of Credit | Term Loan
Debt Instrument [Line Items]
Face amount of the Notes						$ 15,000,000.0
Partial extinguishment of Convertible 3.75% Senior Notes								15,000,000.0
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable
Debt Instrument [Line Items]
Face amount of the Notes								34,405,000					$ 35,789,000		34,405,000		$ 35,789,000		$ 35,789,000
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable
Debt Instrument [Line Items]
Face amount of the Notes	$ 34,405,000							$ 34,405,000					$ 34,405,000		$ 34,405,000		$ 34,405,000		$ 34,405,000
Stated interest rate			7.00%
Conversion price | $ / shares	$ 7.20		$ 7.20					$ 7.20					$ 7.20		$ 7.20		$ 7.20		$ 7.20
Debt issuance costs			$ 2,300,000
Increase to principal balance																	$ 1,400,000
Gross cash proceeds			34,400,000
Net proceeds from the offering			$ 26,900,000
PIK interest			8.00%
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable | 2023 Series A Unsecured Convertible Notes for Series B Senior Unsecured Convertible Notes
Debt Instrument [Line Items]
Debt issuance costs													$ 200,000				200,000		$ 200,000
Exchanged amount			$ 5,100,000														5,100,000
Carrying value of original debt													7,200,000				7,200,000		7,200,000
Fair value of embedded derivative liability			2,000,000.0										2,000,000.0				2,000,000.0		2,000,000.0
Future undiscounted cash flows													$ 6,800,000				6,800,000		$ 6,800,000
Series A Unsecured Convertible Notes due 2023 | Convertible Notes Payable | 2023 Series A Unsecured Convertible Notes for Series B Senior Unsecured Convertible Notes
Debt Instrument [Line Items]
Original exchange amount			$ 9,000,000.0														$ 9,000,000.0
Senior Notes, Due 2023 [Member]
Debt Instrument [Line Items]
Interest rate at period end													27.40%				27.40%		27.40%
Senior Notes, due February 2023 | Convertible Notes Payable
Debt Instrument [Line Items]
Face amount of the Notes								$ 88,464,000					$ 95,665,000		$ 88,464,000		$ 95,665,000		$ 95,665,000