STOCK-BASED COMPENSATION (Details) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015 USD ($) period $ / shares shares	Mar. 31, 2015 $ / shares shares	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) $ / shares shares	Jun. 30, 2014 USD ($)	Nov. 09, 2010 shares
Stock-based compensation, additional disclosure
Closing stock price (in dollars per share) | $ / shares	$ 1.19			$ 1.19
Stock-based compensation plans
Stock-based compensation expense | $	$ 222		$ 88	$ 375	$ 701
Term of U.S. Treasury zero-coupon strip		10 years
ESPP
Stock-based compensation plans
Shares reserved for issuance under stock purchase plan						166,667
Discount rate (as a percent)	10.00%
Number of Offering periods | period	4
Stock-based compensation expense | $	$ 1		$ 1	$ 1	$ 1
Number of shares available for grant or purchase	165,720			165,720
2009 Equity Incentive Plan
Stock-based compensation
Number of shares reserved for issuance	4,133,133			4,133,133
Stock-based compensation plans
Number of shares available for grant or purchase	1,365,452			1,365,452
Employee stock option
Stock-based compensation
Expiration period	10 years
Assumptions used to estimate the fair values of the stock options granted
Risk-free interest rate (as a percent)		1.80%
Expected volatility (as a percent)		68.40%
Expected life (in years)		6 years 10 months 24 days
Forfeiture rate		5.00%
Number of Shares
Options granted (in shares)		1,964,665		1,964,665
Outstanding at the end of the period (in shares)	1,964,665			1,964,665
Vested and exercisable at the end of the period and expected to vest thereafter (in shares)	1,811,132			1,811,132
Weighted-Average Exercise Price
Options granted (in dollars per share) | $ / shares		$ 1.52		$ 1.52
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 1.52			1.52
Vested and exercisable at the end of the period and expected to vest thereafter (in dollars per share) | $ / shares	1.52			$ 1.52
Weighted-Average Remaining Contractual Term (in years)
Outstanding at the end of the period				9 years 7 months 10 days
Vested and exercisable at the end of the period and expected to vest thereafter				9 years 7 months 10 days
Weighted-Average Grant-Date Fair Value
Options granted (in dollars per share) | $ / shares		$ 0.99		$ 0.99
Outstanding at the end of the period (in dollars per share) | $ / shares	0.99			0.99
Vested and exercisable at the end of the period and expected to vest thereafter (in dollars per share) | $ / shares	$ 0.99			$ 0.99
Aggregate Intrinsic Value
Options granted | $	$ (648)			$ (648)
Vested and exercisable at the end of the period and expected to vest thereafter | $	(598)			(598)
Unrecognized compensation cost
Unrecognized compensation cost | $	$ 1,675			1,675
Weighted-average remaining vesting period of recognition	1 year 4 months 24 days
Employee stock option | Maximum
Stock-based compensation
Vesting period	3 years
Restricted common stock
Unrecognized compensation cost
Unrecognized compensation cost | $	$ 150			$ 150
Number of units
Unvested at the beginning of the period (in shares)		7,379		7,379
Granted (in shares)				184,761
Vested (in shares)				(36,967)
Unvested at the end of the period (in shares)	155,173			155,173
Expected to vest at the end of the period (in shares)	155,173			155,173
Weighted-Average Grant-Date Fair Value
Vested (in dollars per share) | $ / shares				$ 1.92
Restricted common stock | Maximum
Unrecognized compensation cost
Weighted-average remaining vesting period of recognition				1 year