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NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK (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
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK        
Net loss $ (2,759) $ (12,416) $ (26,722) $ (32,605)
Basic loss attributable to common stock (2,759) (12,416) (26,722) (32,605)
Diluted loss attributable to common stock $ (2,759) $ (12,416) $ (26,722) $ (32,605)
Weighted average common shares outstanding:        
Basic 21,701,662 21,622,349 21,681,474 21,603,065
Diluted 21,701,662 21,622,349 21,681,474 21,603,065
Basic loss per share attributable to common stock $ (0.13) $ (0.57) $ (1.23) $ (1.51)
Diluted loss attributable to a share of common stock $ (0.13) $ (0.57) $ (1.23) $ (1.51)