STOCK BASED COMPENSATION (Details 3)	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share Based Compensation Stock Options Activity [Line Items]
Number of Underlying Shares, Outstanding as of January 1, 2015 (in shares) | shares	3,675,634
Number of Underlying Shares, Granted (in shares) | shares	1,845,822
Number of Underlying Shares, Forfeited (in shares) | shares	(1,557,512)
Number of Underlying Shares, Expired (in shares) | shares	(350,000)
Number of Underlying Shares, Outstanding as of December 31, 2015 (in shares) | shares	3,613,944
Number of Underlying Shares, Exercisable as of December 31, 2015 (in shares) | shares	1,726,781
Number of Underlying Shares, Vested and expected to vest (in shares) | shares	3,391,660	[1]
Weighted-Average Exercise Price Per Share, Outstanding as of January 1, 2015 (in dollars per share) | $ / shares	$ 2.86
Weighted-Average Exercise Price Per Share, Granted (in dollars per share) | $ / shares	1.43
Weighted-Average Exercise Price Per Share, Forfeited (in dollars per share) | $ / shares	1.78
Weighted-Average Exercise Price Per Share, Expired (in dollars per share) | $ / shares	5.00
Weighted-Average Exercise Price Per Share, Outstanding as of December 31, 2015 (in dollars per share) | $ / shares	2.4
Weighted-Average Exercise Price Per Share, Exercisable as of December 31, 2015 (in dollars per share) | $ / shares	3.14
Weighted-Average Exercise Price Per Share, Vested and expected to vest (in dollars per share) | $ / shares	$ 2.45	[1]
Weighted-Average Contractual Life Remaining in Years, Outstanding as of December 31, 2015	8 years 4 months 24 days
Weighted-Average Contractual Life Remaining in Years, Exercisable as of December 31, 2015	7 years 9 months 18 days
Weighted-Average Contractual Life Remaining in Years, Vested and expected to vest	8 years 4 months 2 days	[1]
Aggregate Intrinsic Value, Outstanding as of January 1, 2015 | $	$ 344,000
Aggregate Intrinsic Value, Granted (in dollars) | $	0
Aggregate Intrinsic Value, Forfeited (in dollars) | $	63,223
Aggregate Intrinsic Value, Expired (in dollars) | $	0
Aggregate Intrinsic Value, Outstanding as of December 31, 2015 | $	0
Aggregate Intrinsic Value, Exercisable as of December 31, 2015 | $	0
Aggregate Intrinsic Value, Vested and expected to vest | $	$ 0	[1]

[1] vested shares and unvested shares after a forfeiture rate is applied