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NET INCOME (LOSS) PER COMMON SHARE - Narrative (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2020
Earnings Per Share [Abstract]      
Options to purchase common stock (in shares) 3.2 0.5 0.4