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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock reserved for future issuance (in shares)   40,086,137   33,769,619
Unrecognized compensation cost related to unvested share-based compensation arrangements granted   $ 24.3    
Weighted-average fair value of options granted (in dollars per share)   $ 0.46 $ 2.23  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost, period for recognition   2 years 3 months    
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost, period for recognition   3 years 3 months 18 days    
Award vesting period   4 years    
Award cliff vesting pperiod   1 year    
Unrecognized compensation costs   $ 7.7    
2021 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, period for increase in shares 10 years      
Percent of outstanding shares 4.00%      
2021 Equity Incentive Plan | Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock reserved for future issuance (in shares) 21,062,853      
Stock-based compensation, maximum number of shares available for issue on the exercise of incentive stock options (in shares) 100,000,000      
2021 Employee Stock Purchase Plan | 2021 ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation, period for increase in shares 10 years      
Percent of outstanding shares 1.00%      
Stock-based compensation, number of additional shares allowable under the plan (in shares) 2,850,000      
Stock-based compensation, purchase period 6 months      
2021 Employee Stock Purchase Plan | Class A Common Stock | 2021 ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock reserved for future issuance (in shares) 4,402,757      
Stock-based compensation, discount percentage from market price, beginning of period 85.00%