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Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 12 Months Ended
Jul. 28, 2021
USD ($)
$ / shares
shares
Sep. 30, 2023
shares
Dec. 31, 2023
USD ($)
vote
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
shares
Aug. 31, 2023
USD ($)
Dec. 31, 2020
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Overstatement of deferred contract acquisition costs     $ (15,562,000) $ (14,383,000) $ (10,365,000)   $ (6,263,000)
Understatement of accumulated deficit     411,569,000 352,534,000 247,829,000    
Sale of stock, consideration received on transaction $ 386,600,000            
Payments of stock issuance costs     0 204,000 5,302,000    
Payments of other stock issuance costs $ 5,700,000            
Stock split conversion ratio 0.5            
Foreign currency transaction gain (loss)     1,400,000 2,500,000 200,000    
Accounts receivable, allowance for credit loss     $ 515,000 487,000      
Guarantee obligations, term     six        
Contract term with merchant     1 year        
Capitalized contract cost, amortization period     4 years        
Capitalized contract cost, impairment loss     $ 0 0 0    
Chargeback expense     (25,000,000) (20,300,000) (14,300,000)    
Advertising expense     4,900,000 6,000,000 5,200,000    
Total share-based compensation expense     $ 62,410,000 67,467,000 $ 33,358,000    
Number of operating segments | segment     1        
Number of reportable segments | segment     1        
Operating lease right-of-use assets     $ 29,742,000 35,158,000      
Present value of operating lease liabilities     $ 31,309,000        
Series E-1 Convertible Preferred Stock [Member]              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Issuance of convertible preferred stock (in shares) | shares   962,940     962,940    
Common Class A              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Votes per common share | vote     1        
Authorized amounts under repurchase program           $ 75,000,000  
Common Class B              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Votes per common share | vote     10        
Software Development              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Capitalized software costs     $ 3,500,000 5,000,000      
Amortization of intangible assets     1,500,000 700,000 $ 400,000    
Cloud Computing Arrangement Implementation Costs              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Capitalized software costs     700,000 200,000      
Amortization of intangible assets     $ 200,000 $ 200,000 $ 200,000    
Software and Software Development Costs              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Property and equipment, useful life     4 years        
IPO              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Sale of stock, number of shares issued in transaction (in shares) | shares 19,925,000            
Sale of stock, price per share (in dollars per share) | $ / shares $ 21.00            
Payments of stock issuance costs $ 26,200,000            
Stock issued, conversion of convertible securities (in shares) | shares 32,291,470            
Over-Allotment Option              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Sale of stock, number of shares issued in transaction (in shares) | shares 2,625,000            
Restricted Stock Units (RSUs) | Minimum              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Award vesting period     4 years        
Restricted Stock Units (RSUs) | Maximum              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Award vesting period     5 years        
Restricted Stock Units (RSUs) | Share-based Payment Arrangement, Tranche Two              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Award vesting period     6 months