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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jul. 02, 2021
USD ($)
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2022
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Accounting Policies [Line Items]                
Number of operating segments | segment   1            
Foreign currency transaction gains (losses)   $ (943,000) $ 1,755,000 $ 2,572,000        
Cash equivalents   30,200,000 5,200,000          
Restricted cash equivalent balance   0 25,000,000 25,000,000     $ 25,000,000  
Personal loan     50,000,000       $ 50,000,000  
Reclassification of restricted cash equivalent to unrestricted cash equivalent           $ 25,000,000    
Other than temporary impairment of available for sale debt security recognized in statement of operations     4,900,000          
Other than temporary impairment of available for sale debt security recognized in other comprehensive loss     94,000          
Loss on debt extinguishment   7,748,000 0 0        
Capitalized deferred offering costs $ 5,600,000 5,636,000 0 0        
Total stockholders’ equity (deficit)   197,551,000 (550,632,000) (556,991,000)       $ (556,535,000)
Advertising expense   $ 195,400,000 119,200,000 67,200,000        
Forecast                
Accounting Policies [Line Items]                
Operating lease assets         $ 5,000,000      
Operating lease liabilities         $ 7,000,000      
Minimum                
Accounting Policies [Line Items]                
Remaining Weighted average useful life (in years)   2 years            
Maximum                
Accounting Policies [Line Items]                
Remaining Weighted average useful life (in years)   6 years            
Purchased and internal-use software                
Accounting Policies [Line Items]                
Estimated useful life   3 years            
Cumulative Effect, Period of Adoption, Adjustment                
Accounting Policies [Line Items]                
Total stockholders’ equity (deficit)               $ 996,000
Cost of revenue                
Accounting Policies [Line Items]                
Filing fees   $ 79,800,000 64,500,000 50,700,000        
Other Nonoperating Income (Expense)                
Accounting Policies [Line Items]                
Other than temporary impairment of available for sale debt security recognized in statement of operations     4,800,000          
Other Noncurrent Assets                
Accounting Policies [Line Items]                
Deferred offering costs non current   0 0 $ 3,700,000        
Prepaid Expenses and Other Current Assets                
Accounting Policies [Line Items]                
Deferred cost of revenue   $ 1,800,000 $ 2,000,000          
Customer One | Accounts Receivable | Customer Concentration Risk                
Accounting Policies [Line Items]                
Concentration risk percentage     20.00%          
Outside United States | Revenue Benchmark | Geographic Concentration Risk                
Accounting Policies [Line Items]                
Concentration risk percentage   1.00% 1.00% 4.00%        
Outside United States | Property, Plant and Equipment | Geographic Concentration Risk                
Accounting Policies [Line Items]                
Property plant and equipment percent   1.00% 1.00%