STOCKHOLDERS' EQUITY - Securities Authorized for Issuance Under Compensation Plans (Details 3) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Securities authorized for issuance under compensation plans
Weighted average exercise price (in dollars per share)	$ 2.26		$ 2.26
Incentive options
Outstanding at the end of the period (in shares)	3,593,589
Weighted Average Exercise Price
Outstanding at the end of the period (in dollars per share)	$ 2.26
Exercise price 0.36
Compensation plan
Exercise Price (in dollars per share)			0.36
Exercise price 1.23
Compensation plan
Exercise Price (in dollars per share)			1.23
Exercise price 3.01
Compensation plan
Exercise Price (in dollars per share)				$ 3.01
Exercise price 6.66
Compensation plan
Exercise Price (in dollars per share)				6.66
Employee stock options
Securities authorized for issuance under compensation plans
Weighted average exercise price (in dollars per share)	$ 4.37	$ 2.65	$ 2.26	$ 4.37
Compensation plan
Exercisable period	5 years
Vesting period	3 years
Incentive options
Outstanding at the beginning of the period (in shares)	1,987,159	1,490,574
Issued (in shares)	2,730,400	1,372,920
Exercised (in shares)		(649,002)
Expired (in shares)	(89,100)
Forfeited (in shares)	(1,034,870)	(227,333)
Outstanding at the end of the period (in shares)	3,593,589	1,987,159
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 4.37	$ 2.65
Issued (in dollars per share)	0.88	5.18
Exercise price (in dollars per share)		2.27
Expired (in dollars per share)	2.61
Forfeited (in dollars per share)	2.64	3.98
Outstanding at the end of the period (in dollars per share)	$ 2.26	$ 4.37
Restricted Stock
Compensation plan
Granted (in shares)	1,669,655	525,296
2010 Stock Incentive Plan
Securities authorized for issuance under compensation plans
Number of Shares Authorized for Issuance under plan			9,950,000
Number of securities to be issued upon exercise of outstanding options and restricted stock (in shares)			4,871,057
Weighted-average exercise price of outstanding options and restricted stock (in dollars per share)	$ 1.85		$ 1.85
Number of securities remaining available for future issuance under equity compensation plans (in shares)			2,828,050
Weighted Average Exercise Price
Weighted-average exercise price of outstanding options and restricted stock (in dollars per share)	$ 1.85