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STOCK-BASED COMPENSATION - Summary of RSU activity (Details)
3 Months Ended
Mar. 31, 2022
shares
Restricted stock units  
RSUs activity  
Outstanding December 31, 2021 9,725,027
Awarded 12,626,426
Vested (276,366)
Forfeited (377,996)
Outstanding March 31, 2022 21,697,091
Vesting period (in years) 4 years
Stock options  
RSUs activity  
Vesting period (in years) 3 years 6 months