Debt - Narrative (Details)							1 Months Ended					3 Months Ended			16 Months Ended
	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 ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) $ / shares	Dec. 22, 2014 USD ($)	Dec. 16, 2014 USD ($)
Debt Instrument [Line Items]
Non cash interest expense												$ 1,984,000		$ 2,020,000
Partial extinguishment of equity component												(7,600,000)
Debt partial extinguishment												0		185,000
Proceeds from Revolver												0		$ 5,000,000
Derivative liability												5,300,000			$ 5,300,000
Remeasured derivative liability							$ 6,776,000					8,034,000			8,034,000
Subsequent Event
Debt Instrument [Line Items]
Pre-reverse stock split shares (in shares) | shares	5,389,949
Exercise price (dollars per share) | $ / shares	$ 0.01
Period warrants are exercisable	5 years
Convertible Notes Payable
Debt Instrument [Line Items]
Face amount of the Notes							213,959,000					216,341,000			216,341,000
Carrying value of original debt							186,370,000					190,347,000			190,347,000
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
Derivative liability												13,500,000			13,500,000
Remeasured derivative liability												2,800,000			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]
Proceeds from Revolver											$ 52,800,000
Line of Credit | Subsequent Event
Debt Instrument [Line Items]
Interest rate, effective percentage	4.25%
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
Debt issuance costs												300,000			300,000
Unamortized discount												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
Remeasured derivative liability							0					$ 5,253,000			$ 5,253,000
Repayment fee								$ 100,000
Line of Credit | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Interest rate, effective percentage												6.20%			6.20%
Line of Credit | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Interest rate, effective percentage												9.10%			9.10%
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 | Subsequent Event
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Line of Credit | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum | Subsequent Event
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												2.75%
Line of Credit | Revolving Credit Facility | Base Rate | Subsequent Event
Debt Instrument [Line Items]
Basis spread on variable rate	4.50%
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
Unamortized discount												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 | Subsequent Event
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR) | Maximum | Subsequent Event
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												7.75%
Line of Credit | Term Loan | Base Rate | Subsequent Event
Debt Instrument [Line Items]
Basis spread on variable rate	12.00%
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
Debt partial extinguishment						$ 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						$ 4.45
Settlement conversion price (dollars per share) | $ / shares						$ 280.90
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												$ 2,400,000			10,900,000
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
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												9.10%			9.10%
Delayed Draw Term Loan A | Term Loan | Maximum
Debt Instrument [Line Items]
Interest rate, effective percentage												12.20%			12.20%
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
Debt partial extinguishment							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					$ 34,405,000			$ 34,405,000
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
Stated interest rate		7.00%
Conversion price | $ / shares		$ 0.72					$ 0.72					$ 0.72			$ 0.72
Debt issuance costs		$ 2,300,000
Gross cash proceeds		$ 34,400,000
PIK interest		8.00%
Net proceeds from the offering		$ 26,900,000
Remeasured derivative liability							$ 6,776,000					$ 2,781,000			$ 2,781,000
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
Exchanged amount		5,100,000										5,100,000
Carrying value of original debt												7,200,000			7,200,000
Fair value of embedded derivative liability												2,000,000.0			2,000,000.0
Future undiscounted cash flows												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%
Senior Notes, due February 2023 | Convertible Notes Payable
Debt Instrument [Line Items]
Face amount of the Notes							$ 88,464,000					$ 90,846,000			$ 90,846,000