STOCK-BASED COMPENSATION (Details) - RSA	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Number of unvested RSA shares
Unvested shares as of January 1, 2015 | shares	2,063,100
Granted on March 12, 2015 | shares	73,194
Granted on August 18, 2015 | shares	2,155,538
Granted on September 30, 2015 | shares	75,000
Granted on October 5, 2015 | shares	295,586
Vested on January 25, 2015 | shares	(65,638)
Vested on April 1, 2015 | shares	(1,272,834)
Vested on May 1, 2015 | shares	(6,232)
Vested on May 20, 2015 | shares	(76,744)
Vested on July 14, 2015 | shares	(29,789)
Vested on October 15, 2015 | shares	(48,747)
Vested on November 1, 2015 | shares	(6,232)
Vested on November 30, 2015 | shares	(16,157)
Vested on December 31, 2015 | shares	(106,280)
Forfeited | shares	(690,392)
Unvested shares as of December 31, 2015 | shares	2,343,373
Weighted Average Grant-Date Fair Value
Unvested per shares as of January 1, 2015 | $ / shares	$ 3.40
Granted on March 12, 2015 | $ / shares	1.38
Granted on August 18, 2015 | $ / shares	0.61
Granted on September 30, 2015 | $ / shares	0.48
Granted on October 5, 2015 | $ / shares	0.50
Vested on January 25, 2015 | $ / shares	3.14
Vested on April 1, 2015 | $ / shares	3.16
Vested on May 1, 2015 | $ / shares	2.39
Vested on May 20, 2015 | $ / shares	3.96
Vested on July 14, 2015 | $ / shares	3.89
Vested on October 15, 2015 | $ / shares	2.74
Vested on November 1, 2015 | $ / shares	2.39
Vested on November 30, 2015 | $ / shares	3.88
Vested on December 31, 2015 | $ / shares	3.88
Forfeited | $ / shares	1.72
Unvested per shares as of December 31, 2015 | $ / shares	$ 0.98