STOCK-BASED COMPENSATION - RSUs (Details) - RSU's - 2012 Equity Incentive Plan - USD ($) $ / shares in Units, $ in Millions							3 Months Ended		9 Months Ended
	May 16, 2017	Dec. 07, 2016	Sep. 09, 2016	Dec. 03, 2015	Jun. 24, 2015	May 06, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restricted stock units
Granted (in shares)					1,663,660				45,000
Share price (in dollars per share)					$ 14.00
Vesting percentage					20.00%
Shares forfeited to date									44,919
Shares remaining to be issued in future years (in shares)							635,518		635,518
Incremental compensation cost						$ 22.0
Issuance of common stock for vested 2015 and 2016 restricted stock units (in shares)		278,483
Number of RSU's
Outstanding at the beginning of period									664,000
Granted (in shares)					1,663,660				45,000
Vested (in shares)									(29,000)
Outstanding at the end of period							680,000		680,000
Weighted average exercise price:
Weighted average remaining period									1 year 1 month 6 days
General and administrative expense.
Restricted stock units
Stock-based compensation expense							$ 0.8	$ 1.4	$ 2.3	$ 4.2
Share-based Compensation Award, Tranche One
Restricted stock units
Period for shares vested expected to be issued				3 days
Share-based Compensation Award, Tranche Two
Restricted stock units
Period for shares vested expected to be issued				3 days
Non Employee Director
Restricted stock units
Granted (in shares)	44,856		28,752
Granted (in dollars per share)	$ 5.35		$ 6.26
Vesting period of shares	30 days
Amortized over period from the grant date	1 year
Issuance of common stock for vested 2015 and 2016 restricted stock units (in shares)	28,752		28,752
Number of RSU's
Granted (in shares)	44,856		28,752