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Face (par) amount of debt instrument at time of issuance.

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DEBT - Narrative (Details)			1 Months Ended					12 Months Ended
DEBT - Narrative (Details)	Jan. 28, 2019 USD ($)	Feb. 28, 2018 USD ($) $ / shares shares	Aug. 31, 2018 USD ($) $ / shares	Feb. 28, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)	Feb. 28, 2017 USD ($)	Jul. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2018 shares	Nov. 30, 2012 USD ($)
Short-term Debt [Line Items]
Proceeds from debt, net of issuance costs								$ 68,024,000	$ 26,442,000	$ 23,989,000
Payments under revolving credit facility								0	10,100,000	$ 16,900,000
Warrants issued in connection with debt		$ 1,400,000		$ 1,400,000
Value of future purchase option					$ 700,000				700,000
Measurement Input, Quoted Price \| Cashless Exercise Warrants
Short-term Debt [Line Items]
Warrants and rights, measurement input \| $ / shares		1.05		1.05
Measurement Input, Share Price \| Cashless Exercise Warrants
Short-term Debt [Line Items]
Warrants and rights, measurement input \| $ / shares		1.56		1.56
Measurement Input, Price Volatility \| Cashless Exercise Warrants
Short-term Debt [Line Items]
Warrants and rights, measurement input		0.859		0.859
Measurement Input, Risk Free Interest Rate \| Cashless Exercise Warrants
Short-term Debt [Line Items]
Warrants and rights, measurement input		0.0223		0.0223
Measurement Input, Expected Dividend Rate \| Cashless Exercise Warrants
Short-term Debt [Line Items]
Warrants and rights, measurement input		0.00		0.00
Measurement Input, Expected Term \| Cashless Exercise Warrants
Short-term Debt [Line Items]
Warrants and rights outstanding, term		7 years		7 years
Tennenbaum Capital Partners, LLC \| Secured Debt
Short-term Debt [Line Items]
Proceeds from debt, net of issuance costs							$ 25,000,000
Interest rate during period							10.25%
Commitment fee percentage							3.30%
Closing fee							10.00%
Tennenbaum Capital Partners, LLC \| Secured Debt \| Minimum
Short-term Debt [Line Items]
Prepayment fee							1.00%
Tennenbaum Capital Partners, LLC \| Secured Debt \| Maximum
Short-term Debt [Line Items]
Prepayment fee							3.00%
Tennenbaum Capital Partners, LLC \| Secured Debt \| LIBOR
Short-term Debt [Line Items]
Interest rate during period							9.5625%
Reduction of interest rate during period							1.00%
Amended Term Loan Agreement, February 2017 \| Tennenbaum Capital Partners, LLC \| Secured Debt
Short-term Debt [Line Items]
Debt instrument face amount						$ 25,000,000
Second Amendment To Term Loans \| Secured Debt
Short-term Debt [Line Items]
Percent decrease in principal payments		(50.00%)
Convertible Notes Payable \| Convertible Senior Notes Due 2023
Short-term Debt [Line Items]
Debt instrument face amount			$ 60,000,000
Proceeds from issuance of debt			62,400,000
Debt underwriter fees			2,000,000
Debt issuance costs			$ 600,000
Interest rate			4.00%
Principal amount multiples			$ 1,000
Conversion rate of common stock (in dollars per share)			0.1800180
Debt conversion price (in usd per share) \| $ / shares			$ 5.5600
Redemption price percentage			100.00%
Unamortized issuance costs and debt discounts					0			2,361,000	0
Secured Debt \| Amended Term Loan Agreement, February 2017 \| Closing Date to March 31, 2018
Short-term Debt [Line Items]
Liquidity ratio required				1.5
Secured Debt \| Amended Term Loan Agreement, February 2017 \| April 1, 2018 and Thereafter
Short-term Debt [Line Items]
Liquidity ratio required				1.75
Secured Debt \| Amended Term Loan Agreement, February 2017 \| Tennenbaum Capital Partners, LLC
Short-term Debt [Line Items]
Interest rate during period						10.3125%
Commitment fee percentage						3.00%
Closing fee						4.00%
Unrestricted cash				$ 10,000,000
Number of securities called by warrants (in shares) \| shares		1,220,000		1,220,000							912,067
Class of warrant term year				7 years
Secured Debt \| Amended Term Loan Agreement, February 2017 \| Tennenbaum Capital Partners, LLC \| Measurement Input, Quoted Price
Short-term Debt [Line Items]
Warrants and rights, measurement input \| $ / shares		1.05		1.05
Secured Debt \| Amended Term Loan Agreement, February 2017 \| Tennenbaum Capital Partners, LLC \| Minimum
Short-term Debt [Line Items]
Prepayment fee						1.00%
Secured Debt \| Amended Term Loan Agreement, February 2017 \| Tennenbaum Capital Partners, LLC \| Maximum
Short-term Debt [Line Items]
Prepayment fee						3.00%
Secured Debt \| Amended Term Loan Agreement, February 2017 \| Tennenbaum Capital Partners, LLC \| LIBOR
Short-term Debt [Line Items]
Basis spread on variable rate						9.25%
Secured Debt \| Term Loan Agreement, July 2016
Short-term Debt [Line Items]
Unamortized issuance costs and debt discounts					2,111,000			1,059,000	$ 2,111,000
Secured Debt \| Term Loan Agreement, July 2016 \| Tennenbaum Capital Partners, LLC
Short-term Debt [Line Items]
Debt instrument face amount							$ 25,000,000
Line of Credit \| Wells Fargo Bank \| Revolving Credit Facility
Short-term Debt [Line Items]
Payments under revolving credit facility						$ 10,300,000
Maximum borrowing capacity												$ 50,000,000
Financing Receivable \| Financing Receivable Recorded as Debt
Short-term Debt [Line Items]
Proceeds from debt, net of issuance costs					$ 2,800,000			5,600,000
Thurman John Rodgers \| Convertible Notes Payable \| Convertible Senior Notes Due 2023
Short-term Debt [Line Items]
Debt instrument face amount								$ 5,000,000
Subsequent Event
Short-term Debt [Line Items]
Repayments of debt	$ 39,500,000