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NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK
Net loss	$ (14,809)	$ (11,589)	$ (23,963)	$ (20,189)
Basic loss attributable to common stock	(14,809)	(11,589)	(23,963)	(20,189)
Diluted loss attributable to common stock	$ (14,809)	$ (11,589)	$ (23,963)	$ (20,189)
Weighted average common shares outstanding:
Basic	21,682,757	21,605,262	21,671,212	21,593,317
Diluted	21,682,757	21,605,262	21,671,212	21,593,317
Basic loss per share attributable to common stock	$ (0.68)	$ (0.54)	$ (1.11)	$ (0.93)
Diluted loss attributable to a share of common stock	$ (0.68)	$ (0.54)	$ (1.11)	$ (0.93)

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