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NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK
Net loss	$ (9,154)	$ (8,600)
Basic loss attributable to common stock	(9,154)	(8,600)
Diluted loss attributable to common stock	$ (9,154)	$ (8,600)
Weighted average common shares outstanding:
Basic	21,659,539	21,629,817
Diluted	21,659,539	21,629,817
Basic loss per share attributable to common stock	$ (0.42)	$ (0.40)
Diluted loss attributable to a share of common stock	$ (0.42)	$ (0.40)

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