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Debt instrument percentage of par value owned by supporting holders.

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Debt instrument principal amount redeemable.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Long-term Debt - Additional Information (Details) $ / shares in Units, shares in Thousands	1 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares	Feb. 28, 2018	Jan. 31, 2018 USD ($) shares	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2018 USD ($) Trading $ / shares	Sep. 30, 2017 USD ($)	Jul. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Gain on extinguishment of debt					$ 53,000	$ 0
Maximum borrowing capacity							$ 30,000,000
Line of credit facility, amount borrowed							10,000,000
Purchase Money Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 23,400,000
Debt stated interest rate percentage							10.25%
Credit agreement maturity month and year					2018-10
Prepayment fees	$ 500,000
Credit Facility
Debt Instrument [Line Items]
Debt, face amount	15,000,000			$ 15,000,000	$ 15,000,000			$ 5,000,000
Debt issuance costs allocated to the equity component	157,000			157,000	157,000			599,000
Prepayment fees	300,000
Amended And Restated Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 30,000,000			30,000,000	30,000,000
Debt Instrument maturity date	Aug. 01, 2021
Borrowings under credit facility	$ 15,000,000			$ 15,000,000	$ 15,000,000
Amended And Restated Credit Facility \| Interest Rate Through and Including August 2020
Debt Instrument [Line Items]
Debt stated interest rate percentage	11.75%			11.75%	11.75%
Amended And Restated Credit Facility \| Interest Rate August 2020 Thereafter
Debt Instrument [Line Items]
Debt stated interest rate percentage	12.75%			12.75%	12.75%
Second Lien Notes
Debt Instrument [Line Items]
Debt, face amount	$ 6,961,000			$ 6,961,000	$ 6,961,000			$ 85,239,000
Debt stated interest rate percentage	10.00%			10.00%	10.00%			10.00%
Debt issuance costs allocated to the equity component	$ 7,000			$ 7,000	$ 7,000			$ 189,000
Senior Notes
Debt Instrument [Line Items]
Debt, face amount								$ 1,872,000
Debt stated interest rate percentage	10.00%			10.00%	10.00%			10.00%
Debt issuance costs allocated to the equity component								$ 25,000
Senior Loan Facility
Debt Instrument [Line Items]
Debt, face amount	$ 29,000,000			$ 29,000,000	$ 29,000,000			$ 29,995,000
Senior Loan Facility \| Credit Facility
Debt Instrument [Line Items]
Debt instrument extended maturity period		2020-01
2023 Notes
Debt Instrument [Line Items]
Debt, face amount	$ 60,000,000			$ 60,000,000	$ 60,000,000
Debt stated interest rate percentage	6.00%			6.00%	6.00%			6.00%
Debt Instrument maturity date					Sep. 26, 2023
Debt instrument frequency of interest payments					The 2023 Notes mature on September 26, 2023, and interest is payable quarterly in arrears on March 15, June 15, September 15 and December 15 of each year
Debt instrument conversion, consecutive trading days \| Trading					30
Debt instrument, redemption price, percentage					100.00%
Debt instrument redeemable for cash	$ 1,000			$ 1,000	$ 1,000
Fundamental change repurchase price	$ 1,000			$ 1,000	$ 1,000
Percentage of principal amount of debt redeemed.					100.00%
Debt instrument principal of accrued and unpaid interest payable default percentage	100.00%			100.00%	100.00%
Debt instrument, conversion principal amount	$ 47,500,000			$ 47,500,000	$ 47,500,000
Debt issuance costs allocated to the equity component	$ 300,000			300,000	$ 300,000
Closing price of common stock \| $ / shares					$ 10.30
Interest expense					$ 100,000
Contractual interest expense				$ 50,000	$ 50,000
2023 Notes \| Common Stock
Debt Instrument [Line Items]
Debt instrument, conversion price					173.91304
Exercise price of warrants \| $ / shares	$ 0.0001			$ 0.0001	$ 0.0001
Debt instrument, conversion principal amount	$ 1,000			$ 1,000	$ 1,000
Conversion price per share \| $ / shares	$ 5.75			$ 5.75	$ 5.75
Debt instrument, conversion description					The initial conversion rate is 173.91304 shares of common stock or warrants per $1,000 principal amount, representing an initial conversion price of approximately $5.75 per share.
2023 Notes \| Additional Paid-In Capital
Debt Instrument [Line Items]
Carrying amount of the equity component	$ 15,400,000			$ 15,400,000	$ 15,400,000
2023 Notes \| Minimum
Debt Instrument [Line Items]
Debt instrument, conversion price					150
Debt instrument principal Percentage	25.00%			25.00%	25.00%
2023 Notes \| Maximum
Debt Instrument [Line Items]
Debt instrument conversion trading days \| Trading					20
Restructuring Support Agreement \| Supporting Holders \| Secured Debt \| Second Lien Notes
Debt Instrument [Line Items]
Percentage of par value of debt owned by holders			85.00%
Exchange Offer \| Second Lien Notes and Senior Secured Notes
Debt Instrument [Line Items]
Gain on extinguishment of debt			$ 100,000
Exchange Offer \| Secured Debt \| Second Lien Notes
Debt Instrument [Line Items]
Debt, face amount			78,000,000
Exchange Offer \| Secured Debt \| Senior Notes
Debt Instrument [Line Items]
Debt, face amount			$ 7,000
Exchange Offer \| Secured Debt \| Common Stock \| Second Lien Notes and Senior Secured Notes
Debt Instrument [Line Items]
Issuance of preferred stock (in shares) \| shares			40
Exchange Offer \| Secured Debt \| Series A Preferred Stock \| Second Lien Notes and Senior Secured Notes
Debt Instrument [Line Items]
Issuance of preferred stock (in shares) \| shares			30
Exchange Offer \| Secured Debt \| Series B Preferred Stock \| Second Lien Notes and Senior Secured Notes
Debt Instrument [Line Items]
Issuance of preferred stock (in shares) \| shares			900
Exchange Offer \| Secured Debt \| Series C Warrants \| Second Lien Notes and Senior Secured Notes
Debt Instrument [Line Items]
Issuance of preferred stock (in shares) \| shares			8,300