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Summary of Significant Accounting Policies - Additional Information (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Customer
Supplier
ReportingUnit
Segment
Dec. 31, 2019
USD ($)
Customer
Supplier
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Line Items]                      
Standard payment terms                 The Company’s standard payment terms are 30-60 days    
Allowance for doubtful accounts $ 400,000       $ 300,000       $ 400,000 $ 300,000  
Revenue 190,205,000 $ 151,548,000 $ 123,616,000 $ 119,445,000 126,148,000 $ 110,397,000 $ 89,111,000 $ 82,349,000 584,814,000 408,005,000 $ 296,910,000
Accounts receivable 96,295,000       56,012,000       96,295,000 56,012,000  
Cost of revenue                 499,434,000 342,909,000 247,670,000
Accounts payable 98,249,000       40,455,000       $ 98,249,000 40,455,000  
Number of reporting unit | ReportingUnit                 1    
Impairments for goodwill or intangible assets                 $ 0 0  
Impairments for long-lived assets                 0 0  
Proceeds from initial public offering, net of underwriting discounts and commissions                 12,200,000 0.0 0.0
Deferred offering costs 0       0       $ 0 0  
Number of operating segment | Segment                 1    
Payments to suppliers                 $ 417,700,000 284,500,000 210,100,000
Traffic acquisition costs                 74,400,000 54,200,000 34,000,000
Other costs                 7,400,000 4,200,000 $ 3,500,000
Liabilities for uncertain tax positions 2,300               $ 2,300    
Tax Receivables Agreement                      
Significant Accounting Policies [Line Items]                      
Percentage of amount to pay for tax benefits that actually realize                 85.00%    
QLH Class B-1 Unit Holders                      
Significant Accounting Policies [Line Items]                      
Percentage of amount to pay for tax benefits that actually realize                 85.00%    
Internal-use Software                      
Significant Accounting Policies [Line Items]                      
Estimated useful life                 3 years    
Capitalized software development costs 0       0       $ 0 $ 0  
Customer Concentration Risk | Revenue from Contract with Customer Benchmark                      
Significant Accounting Policies [Line Items]                      
Number of major customer | Customer                 1 1  
Revenue                 $ 132,300,000 $ 78,800,000  
Concentration risk percentage                 23.00% 19.00%  
Customer Concentration Risk | Accounts Receivable                      
Significant Accounting Policies [Line Items]                      
Number of major customer | Customer                 2 1  
Concentration risk percentage                   8.00%  
Accounts receivable         4,700,000         $ 4,700,000  
Supplier Concentration Risk | Purchases                      
Significant Accounting Policies [Line Items]                      
Concentration risk percentage                 11.00% 24.00%  
Number of major supplier | Supplier                 1 2  
Cost of revenue                 $ 60,000,000 $ 84,600,000  
Supplier Concentration Risk | Accounts Payable Benchmark                      
Significant Accounting Policies [Line Items]                      
Concentration risk percentage                 25.00% 36.00%  
Number of major supplier | Supplier                 2 2  
Accounts payable 24,500,000       $ 14,700,000       $ 24,500,000 $ 14,700,000  
Minimum                      
Significant Accounting Policies [Line Items]                      
Duration to cancel agreements                 30 days    
Amortization period of finite-lived intangible assets                 2 years    
Minimum | Customer Concentration Risk | Accounts Receivable                      
Significant Accounting Policies [Line Items]                      
Concentration risk percentage                 10.00%    
Accounts receivable 9,800,000               $ 9,800,000    
Maximum                      
Significant Accounting Policies [Line Items]                      
Duration to cancel agreements                 60 days    
Amortization period of finite-lived intangible assets                 10 years    
Maximum | Customer Concentration Risk | Accounts Receivable                      
Significant Accounting Policies [Line Items]                      
Concentration risk percentage                 24.00%    
Accounts receivable $ 23,700,000               $ 23,700,000