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Summary of Significant Accounting Policies - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 22, 2023
shares
Jul. 28, 2022
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
Dec. 31, 2025
USD ($)
segment
$ / shares
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Number of operating segments | segment       1      
Number of reportable segments | segment       1      
Number of days of advance notice for contract termination for monthly billing cycles       5 days      
Number of days of advance notice for contract termination       30 days      
Deferred contract acquisition costs, current       $ 29,634 $ 20,544    
Deferred contract acquisition costs, non-current       47,769 32,527    
Selling and marketing       506,241 404,209 $ 394,369  
Accrued expenses       125,159 99,828    
Accounts payable       $ 29,072 $ 14,579    
Warrants, exercise price (in dollars per share) | $ / shares       $ 0.01 $ 0.01    
Stock and warrants issued       $ 15 $ 14 62  
Capitalized prepaid marketing expense       32,400 32,400    
Prepaid marketing expense       132,849 153,346    
Advertising costs       51,800 45,900 41,600  
Uncertain tax positions     $ 0 1,345 1,334 0 $ 0
Unbilled accounts receivable     1,479 2,256 1,030 1,479 $ 2,253
Cash equivalents       325,900 278,200    
Restricted cash       738 375    
Restricted cash, non-current       0 739    
Cash and cash equivalents       $ 1,064,875 881,473    
Property, plant and equipment, useful life       5 years      
Operating lease, option to extend, renewal term (up to)       10 years      
Foreign currency translation gains (losses)       $ 1,600 1,000 0  
Impairment of long-lived assets       $ 0 $ 0 $ 0  
Capitalized internal-use software              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Property, plant and equipment, useful life       3 years      
Total Expenditures Benchmark | Customer One | Customer Concentration Risk              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Customer concentration risk, percentage       18.00% 17.00% 19.00%  
Total Expenditures Benchmark | Customer Two | Customer Concentration Risk              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Customer concentration risk, percentage       14.00% 16.00% 14.00%  
Total Expenditures Benchmark | Customer Three | Customer Concentration Risk              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Customer concentration risk, percentage       13.00% 12.00% 12.00%  
Interest-Bearing Deposits              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Cash and cash equivalents       $ 150,000      
Unbilled Revenues              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Unbilled accounts receivable       $ 3,300 $ 1,700    
Conversion of Redeemable Common Stock Into Series B Common Stock | Series A Common Stock              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Conversion of common stock (in shares) | shares 64,046,223            
ESPP              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
ESPP purchase discount       15.00%      
ESPP | Call Option              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Percent look-back feature, portion covered by option       0.85      
ESPP | Put Option              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Percent look-back feature, portion covered by option       0.15      
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Conversion of common stock (in shares) | shares 3,935,793            
Increase in prepaid marketing expense     $ 92,600        
Shopify | Private Placement              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Shares issued under purchase agreement (in shares) | shares   2,951,846          
Issuance price per share (in dollars per share) | $ / shares   $ 33.88          
Shopify | Investment Option              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Issuance price per share (in dollars per share) | $ / shares   $ 88.93          
Additional shares available for purchase (in shares) | shares   15,743,174          
Shopify | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Collaborative arrangement, term   7 years          
Collaborative arrangement, renewal term   1 year          
Maximum number of common stock shares in which warrants may be converted (in shares) | shares   15,743,174          
Warrants, exercise price (in dollars per share) | $ / shares   $ 0.01          
Stock and warrants issued   $ 370,300          
Marketing expense       $ 52,900 52,900 $ 52,900  
Prepaid marketing expense       132,800 153,300    
Unrecognized marketing expense       $ 189,500      
Warrants, cost not yet recognized, period for recognition       3 years 7 months 6 days      
Shopify | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Class of Warrant or Right, Vesting Period One              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Warrants, vesting percentage 0.25 0.25          
Shopify | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Class of Warrant or Right, Vesting Periods Two Through Twenty-One              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Warrants, vesting percentage   0.75          
Shopify | Revenue Sharing Agreement              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Revenue from collaborative arrangement exceeding threshold, percentage to be shared   0.15          
Revenue from collaborative arrangement, threshold   $ 1,000          
Selling and marketing       $ 33,200 27,400 $ 21,900  
Accrued expenses       3,000 2,600    
Accounts payable       $ 3,000 $ 2,500    
Minimum              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Deferred contract acquisition costs, capitalized, amortization period       18 months      
Operating lease, term of contract       1 year      
Maximum              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Deferred contract acquisition costs, capitalized, amortization period       60 months      
Operating lease, term of contract       8 years