Annual report pursuant to Section 13 and 15(d)

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

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NET INCOME (LOSS) PER SHARE - Antidilutive Shares (Details) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive shares 25,225,000 28,105,000
Stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive shares 20,225,000 18,105,000
Performance stock options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive shares 5,000,000 10,000,000
Unvested Stock Options    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive shares 8,000,000 8,000,000