RETIREMENT PLAN (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Retirement plan
Percentage of employers matching contribution for participants' contributions	100.00%
Employer contributions	$ 0.8	$ 0.7	$ 0.4
Maximum
Retirement plan
Percentage of employers matching contribution for participants' pay	5.00%