STOCK-BASED COMPENSATION - Summary of Stock Options Under All Plans (Details) - Time-based stock options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Total Options
Outstanding at the beginning of the period (in shares)	913,960
Granted (in shares)	2,298,093
Exercised (in shares)	0
Forfeited and Expired (in shares)	(606,886)
Outstanding at the end of the period (in shares)	2,605,167	913,960
Exercisable at the end of the period (in shares)	374,294
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 26.53
Granted (in dollars per share)	8.53
Exercised (in dollars per share)	0.00
Forfeited/Expired (in dollars per share)	21.60
Outstanding at the end of the period (in dollars per share)	11.84	$ 26.53
Exercisable at the end of the period (in dollars per share)	$ 22.17
Weighted Average Remaining Contractual Term (in years)
Outstanding at the end of the period	8 years 4 months 1 day
Exercisable at the end of the period	2 years 9 months 18 days
Aggregate Intrinsic Value (in thousands)
Outstanding at beginning of period	$ 71
Exercised	0	$ 300	$ 2,000
Outstanding at the end of the period	0	$ 71
Exercisable at the end of the period	$ 0