STOCK-BASED COMPENSATION - RESTRICTED UNITS (Details) - Restricted stock units $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
The 2004 Plan
Stock-based compensation
Vesting period	4 years
Annual vesting percentage	25.00%
Number of Shares
Non-vested restricted stock units at the beginning of the period (in shares) | shares	521,286
Vested (in shares) | shares	(218,404)
Forfeited (in shares) | shares	(33,768)
Non-vested restricted stock units at the end of the period (in shares) | shares	269,114
Weighted Average Grant Date Fair Value Per Share
Non-vested restricted stock units at the beginning of the period (in dollars per share) | $ / shares	$ 8.67
Vested (in dollars per share) | $ / shares	9.26
Forfeited (in dollars per share) | $ / shares	10.54
Non-vested restricted stock units at the end of the period (in dollars per share) | $ / shares	$ 10.90
Weighted Average Remaining Contractual Term
Non-vested restricted stock units at the end of the period	1 year 3 months 7 days
Additional disclosures
Total fair value of awards vested | $	$ 2.0
The 2014 Plan
Stock-based compensation
Vesting period	4 years
Annual vesting percentage	25.00%
Number of Shares
Non-vested restricted stock units at the beginning of the period (in shares) | shares	23,178
Granted (in shares) | shares	522,216
Vested (in shares) | shares	(121,429)
Forfeited (in shares) | shares	(12,850)
Non-vested restricted stock units at the end of the period (in shares) | shares	411,115
Weighted Average Grant Date Fair Value Per Share
Non-vested restricted stock units at the beginning of the period (in dollars per share) | $ / shares	$ 15.53
Granted (in dollars per share) | $ / shares	18.27
Vested (in dollars per share) | $ / shares	17.21
Forfeited (in dollars per share) | $ / shares	18.16
Non-vested restricted stock units at the end of the period (in dollars per share) | $ / shares	$ 18.43
Weighted Average Remaining Contractual Term
Non-vested restricted stock units at the end of the period	1 year 6 months 26 days
Additional disclosures
Total fair value of awards vested | $	$ 2.1