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NET LOSS PER COMMON 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:        
Net loss $ (5,407) $ (6,675) $ (17,573) $ (13,369)
Dividends accumulated on convertible preferred stock 0 (1,931) 0 (5,591)
Net loss attributable to common shareholders $ (5,407) $ (8,606) $ (17,573) $ (18,960)
Denominator:        
Weighted-average common shares outstanding (in shares) 33,667 22,744 32,783 22,678
Net loss per share attributable to common shareholders (basic and diluted) (in dollars per share) $ (0.16) $ (0.38) $ (0.54) $ (0.84)
Aggregate number of common equivalent shares (related to options, warrants and preferred stock) that have been excluded from computations of diluted net loss per common share (in shares)     5,400 6,500