STOCK-BASED COMPENSATION (Details) - Service-based stock options - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stock-Based Compensation
Vesting period					4 years
Expiration period					10 years
Grant date fair value			$ 2.43	$ 3.11	$ 2.22	$ 2.85
Net compensation expense related to employees and directors (in dollars)			$ 700	$ 200	$ 1,600	$ 500
Weighted average assumptions used to estimate fair value of each service-based stock option grant
Expected dividend rate (as a percent)					0.00%
Options
Outstanding at the beginning of the period (in shares)					477,530
Granted (in shares)			69,750		2,018,850
Exercised (in shares)					874
Expired (in shares)					(4,392)
Forfeited (in shares)					(92,875)
Outstanding at the end of the period (in shares)	2,398,239	477,530	2,398,239		2,398,239
Exercisable at the end of the period (in shares)	419,375		419,375		419,375
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)					$ 21.74
Granted (in dollars per share)					3.10
Exercised (in dollars per share)					3.02
Expired (in dollars per share)					48.27
Forfeited (in dollars per share)					3.44
Outstanding at the end of the period (in dollars per share)	$ 6.72	$ 21.74	$ 6.72		6.72
Exercisable at the end of the period (in dollars per share)	$ 20.73		$ 20.73		$ 20.73
Weighted Average Remaining Contractual Term (Years)
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	9 years 1 month 26 days	8 years 15 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	9 years 1 month 26 days	8 years 15 days
Exercisable at the end of the period	7 years 8 months 25 days
Aggregate Intrinsic Value
Exercised					$ 528
Outstanding at the end of the period	$ 921,571		$ 921,571		921,571
Exercisable at end of period	56,702		56,702		56,702
Additional disclosures
Total unrecognized compensation cost (in dollars)	$ 3,500		$ 3,500		$ 3,500
Weighted average period over which unrecognized compensation is expected to be recognized (in years)					3 years 5 months
Total fair value of options vested (in dollars)					$ 900	$ 1,000
Minimum
Weighted average assumptions used to estimate fair value of each service-based stock option grant
Expected stock price volatility (as a percent)					78.80%	82.40%
Risk-free interest rate (as a percent)					1.50%	1.70%
Expected life (in years)					5 years 6 months	5 years 6 months
Maximum
Weighted average assumptions used to estimate fair value of each service-based stock option grant
Expected stock price volatility (as a percent)					88.10%	88.20%
Risk-free interest rate (as a percent)					2.00%	2.20%
Expected life (in years)					6 years 3 months 18 days	6 years 3 months 18 days