Annual report pursuant to Section 13 and 15(d)

NET INCOME (LOSS) PER COMMON SHARE (Details)

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NET INCOME (LOSS) PER COMMON SHARE (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential common stock shares issuable (in shares) 0.5 0.5 0.7
Stock Options      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potential common stock shares issuable (in shares) 0.5