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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares 26,661,000 0 26,661,000 25,618,000
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares 21,661,000 0 21,661,000 18,368,000
Performance stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares 5,000,000 0 5,000,000 7,250,000
Unvested stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive shares 8,000,000 10,750,000 8,000,000 10,750,000