Quarterly report pursuant to Section 13 or 15(d)

NET INCOME (LOSS) PER SHARE - Antidilutive Shares (Details)

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NET INCOME (LOSS) PER SHARE - Antidilutive Shares (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares 6,168,000 3,868,000 7,154,000 8,470,000
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares 5,392,000 3,160,000 6,943,000 6,985,000
Performance stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares 776,000 698,000 211,000 1,465,000
Warrants        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares 0 10,000 0 20,000
Options Outside the Amended 2013 Plan | Amended 2013 Plan        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Unvested stock options excluded from anti-dilutive shares 10,750,000 10,750,000 10,750,000 10,750,000