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Description of Business and Summary of Significant Accounting Policies and Practices - Additional Information (Detail)
shares in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Entity
shares
Dec. 31, 2019
USD ($)
shares
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Percentage of equity interest 10.00%  
Maximum exposure to loss in significant unconsolidated VIEs, equity investments $ 341,000,000  
Property and equipment, estimated useful lives 3 years  
Goodwill $ 17,558,000 $ 32,330,000
Revenue recognized 932,000 1,500,000
Allowances for advertiser credits 206,000 274,000
Deferred revenue $ 1,400,000 866,000
Revenue, Practical expedient description terms The majority of the Company’s total revenue is derived from contracts that include consideration that is variable in nature. The variable elements of these contracts primarily include the number of transactions (for example, the number qualified phone calls). For contracts with an effective term greater than one year, the Company applies the standard’s practical expedient that permits the exclusion of disclosure of the value of unsatisfied performance obligations for these contracts as the Company’s right to consideration corresponds directly to the value provided to the customer for services completed to date and all future variable consideration is allocated to wholly unsatisfied performance obligations. A term for purposes of these contracts has been estimated at 24 months. In addition, the Company applies the standard’s optional exemption to disclose information about performance obligations for contracts that have original expected terms of one year or less  
Advertising costs $ 1,300,000 $ 1,500,000
Number of financial institution | Entity 2  
Equity Option | Class B    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Anti-dilutive shares | shares 3,460 4,782
Restricted Stock | Class B    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Anti-dilutive shares | shares 1,007 1,030
Restricted Stock Units    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Anti-dilutive shares | shares 617 756
Customer Relationships    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Estimated life 24 months  
Customer Contracts    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Deferred contract costs, net $ 167,000 $ 287,000
Amortization associated with deferred contract costs $ 989,000 $ 688,000
Maximum | Customer Contracts    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Threshold amortization period when company obtains a contact 1 year  
Leasehold Improvements | Minimum    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Property and equipment, estimated useful lives 5 years  
Leasehold Improvements | Maximum    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Property and equipment, estimated useful lives 8 years