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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 10, 2021
USD ($)
Dec. 31, 2021
USD ($)
tranche
Dec. 31, 2021
USD ($)
tranche
Dec. 31, 2020
USD ($)
Jul. 30, 2021
USD ($)
Concentration Risk [Line Items]          
Deferred offering costs reclassified to stockholders equity         $ 4,865,000
Advertising costs     $ 42,964,000 $ 27,352,000  
Volunteer program, one-time payment to contributors   $ 4,220,000 4,220,000    
Volunteer program, transaction fees $ 526,000        
Compensation expense     40,804,000 17,031,000  
Impairment     $ 0 0  
Capitalized Software          
Concentration Risk [Line Items]          
Estimated useful life     3 years    
Sales and marketing          
Concentration Risk [Line Items]          
Compensation expense     $ 881,000 348,000  
General and administrative          
Concentration Risk [Line Items]          
Compensation expense     30,617,000 13,904,000  
Research and development          
Concentration Risk [Line Items]          
Compensation expense     9,298,000 $ 2,773,000  
Vested RSUs          
Concentration Risk [Line Items]          
Compensation expense   $ 2,035,000 2,035,000    
Vested RSUs | Sales and marketing          
Concentration Risk [Line Items]          
Compensation expense     210,000    
Vested RSUs | General and administrative          
Concentration Risk [Line Items]          
Compensation expense     493,000    
Vested RSUs | Research and development          
Concentration Risk [Line Items]          
Compensation expense     $ 1,332,000    
Performance Based RSUs | Founders          
Concentration Risk [Line Items]          
Number of tranches | tranche   10 10    
Performance Based RSUs | Tranche One          
Concentration Risk [Line Items]          
Compensation expense     $ 16,463,000    
Accounts Receivable | Customer Concentration Risk | Apple          
Concentration Risk [Line Items]          
Concentration risk, percentage     51.10% 47.80%  
Accounts Receivable | Customer Concentration Risk | Google          
Concentration Risk [Line Items]          
Concentration risk, percentage     27.90% 28.90%  
Accounts Receivable | Customer Concentration Risk | Stripe          
Concentration Risk [Line Items]          
Concentration risk, percentage     10.10% 13.80%  
Revenue Benchmark | Customer Concentration Risk | Apple          
Concentration Risk [Line Items]          
Concentration risk, percentage     50.50% 51.30%  
Revenue Benchmark | Customer Concentration Risk | Google          
Concentration Risk [Line Items]          
Concentration risk, percentage     29.00% 26.90%  
Revenue Benchmark | Customer Concentration Risk | Stripe          
Concentration Risk [Line Items]          
Concentration risk, percentage     10.10%