NET INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator for basic and diluted loss per share
Net loss	$ (7,597)	$ (22,164)	$ (47,206)	$ (33,977)
Denominator
Weighted Average Number of Shares Outstanding, Basic (shares)		37,312	39,540	37,171
Earnings Per Share, Basic	$ (0.19)	$ (0.59)	$ (1.19)	$ (0.91)