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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - Stock options
3 Months Ended
Mar. 31, 2022
$ / shares
shares
Options to purchase shares of common stock activity  
Outstanding at December 31, 2021 44,940,169
Exercised (1,935,844)
Forfeited (763,984)
Outstanding at March 31, 2022 42,240,341
Exercisable at March 31, 2022 31,023,032
Weighted average exercise price | $ / shares $ 4.14