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STOCK INCENTIVE PLANS - Stock Option Roll-forward (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Shares    
Beginning balance (shares) 13,512,820 15,545,850
Options granted (shares) 962,080 1,638,020
Options exercised (shares) (6,965,767) (2,777,010)
Options cancelled/forfeited/expired (shares) (315,940) (894,040)
Ending balance (shares) 7,193,193 13,512,820
Options exercisable (shares) 7,001,403 13,222,800
Weighted average exercise price per share    
Beginning balance (usd per share) $ 0.78  
Options granted (usd per share) 8.90 $ 2.11
Options exercised ( usd per share) 0.94 0.47
Options cancelled/forfeited/expired (usd per share) 1.61 2.57
Ending balance (usd per share) 1.87 0.78
Options exercisable (usd per share) $ 1.81 $ 0.78
Weighted average remaining contractual life (in years) 6 years 5 months 12 days 6 years 4 months 6 days
Weighted average remaining contractual life, options exercisable (in years) 6 years 3 months 21 days 6 years 3 months 21 days