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EARNINGS PER SHARE (Details) - shares
shares in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Common stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 1,505 1,862
Common stock warrants    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 13 868
Unvested restricted stock units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 1,737 1,200
Common stock issuable pursuant to the ESPP    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities (in shares) 49 151