STOCK BASED COMPENSATION - Restricted Stock Units (Details) - Restricted Stock Units - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Restricted Stock Units
Vesting period	5 years
Restricted Stock Units
Restricted stock units at the beginning of the period (in shares)	165
Awarded (in shares)
Released (in shares)
Restricted stock units at the end of the period (in shares)	165	165
Weighted-Average Grant Date Fair Value
Restricted stock units at the beginning of the period (in dollars per share)	$ 3.54
Awarded (in dollars per share)
Released (in dollars per share)
Restricted stock units at the end of the period (in dollars per share)	$ 3.54	$ 3.54
Weighted Average Remaining Contractual Life
Restricted stock units	2 years 1 month 2 days	2 years 3 months 29 days
Aggregate Intrinsic Value
Restricted stock units	$ 1,485	$ 1,158
Stock price	$ 9.00	$ 7.02
Vested (in shares)
First installment
Restricted Stock Units
Vesting (as a percent)	50.00%
Second installment
Restricted Stock Units
Vesting (as a percent)	50.00%