STOCK BASED COMPENSATION - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
STOCK BASED COMPENSATION
Stock options granted (in shares)	645,000	2,733,000
Exercise price of options granted (in dollars per share)	$ 3.99	$ 1.03
Exercisable period of options	2 years 10 months 24 days
Number of common stock reserved for issuance	17,500,000
Number of shares of common stock reserved for issuance	5,294,563
Shares
Balance at the beginning of the period (in shares)	6,954,000	4,651,000
Granted (in shares)	645,000	2,733,000
Exercised (in shares)	(1,457,000)
Forfeited (in shares)	(1,422,000)	(272,000)
Expired (in shares)		(158,000)
Balance at the end of the period (in shares)	4,720,000	6,954,000	4,651,000
Exercisable at the end of the period (in shares)	2,257,000
Weighted Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 2.49	$ 3.35
Granted (in dollars per share)	3.99	1.03
Exercised (in dollars per share)	2.51	1.29
Forfeited (in dollars per share)	2.48	2.82
Expired (in dollars per share)	3.45	2.12
Balance at the end of the period (in dollars per share)	2.41	$ 2.49	$ 3.35
Exercisable (in dollars per share)	$ 2.74
Weighted Average Remaining Contractual Life
Outstanding at the end of the period	3 years 4 months 24 days	4 years 1 month 6 days	4 years 4 months 24 days
Exercisable period of options	2 years 10 months 24 days
Intrinsic Value
Exercised (in dollars)	$ 1,601
Outstanding at the end of the period (in dollars)	4,388	$ 98
Exercisable at the end of the period (in dollars)	$ 1,697
Granted (in shares)	645,000	2,733,000
Maximum
STOCK BASED COMPENSATION
Maximum number of shares that may be subject to grants of options to an individual in a calendar year	1,000,000
Certain employees and directors
STOCK BASED COMPENSATION
Stock options granted (in shares)	700,000	2,700,000	1,700,000
Exercise price of options granted (in dollars per share)	$ 3.99	$ 1.00	$ 2.90	$ 3.00
Shares
Granted (in shares)	700,000	2,700,000	1,700,000
Weighted Average Exercise Price
Granted (in dollars per share)	$ 3.99	$ 1.00	$ 2.90	$ 3.00
Intrinsic Value
Granted (in shares)	700,000	2,700,000	1,700,000
Vesting period of options	3 years
Exercise period of options	5 years