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Description of Business and Summary of Significant Accounting Policies and Practices - Additional Information (Detail)
shares in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Entity
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Dec. 31, 2020
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
Proceeds from sale of equity $ 400,000,000    
Property and equipment, estimated useful lives   3 years  
Capitalized software development costs   $ 1,000,000.0  
Goodwill   17,558,000 17,558,000
Revenue recognized   1,400,000 932,000
Allowances for advertiser credits   157,000 662,000
Deferred revenue   $ 2,000,000.0 1,400,000
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   $ 1,400,000 $ 1,300,000
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   3,601 3,460
Restricted Stock | Class B      
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]      
Anti-dilutive shares | shares   965 1,007
Restricted Stock Units      
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]      
Anti-dilutive shares | shares   553 617
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   $ 128,000 $ 167,000
Amortization associated with deferred contract costs   $ 1,200,000 $ 989,000
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  
Software and Software Development Costs      
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]      
Estimated life   3 years