LOSS PER COMMON SHARE - EPS Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Shares
Basic net loss per share (in shares)	38,654,086	36,980,356	38,301,893	36,728,911
Weighted average common shares outstanding, diluted (in shares)	38,654,086	36,980,356	38,301,893	36,728,911
Net Loss
Net loss	$ (17,794)	$ (37,113)	$ (42,113)	$ (39,300)
Dilutive net earnings (loss) per share	$ (17,794)	$ (37,113)	$ (42,113)	$ (39,300)
Net earnings (loss) per common share, basic (in dollars per share)	$ (0.46)	$ (1.00)	$ (1.10)	$ (1.07)
Net earnings (loss) per common share, diluted (in dollars per share)	$ (0.46)	$ (1.00)	$ (1.10)	$ (1.07)