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NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCK        
Net loss $ (12,416,000) $ (2,870,000) $ (32,605,000) $ (21,339,000)
Basic loss attributable to common stock (12,416,000) (2,870,000) (32,605,000) (21,339,000)
Diluted loss attributable to common stock $ (12,416,000) $ (2,870,000) $ (32,605,000) $ (21,339,000)
Weighted average common shares outstanding:        
Basic 21,622,349 21,571,513 21,603,065 20,386,202
Diluted 21,622,349 21,571,513 21,603,065 20,386,202
Basic loss attributable to a share of common stock $ (0.57) $ (0.13) $ (1.51) $ (1.05)
Diluted loss attributable to a share of common stock $ (0.57) $ (0.13) $ (1.51) $ (1.05)