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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, 2023
USD ($)
Entity
shares
Dec. 31, 2022
USD ($)
shares
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Property and equipment, estimated useful lives 3 years  
Capitalized software development costs $ 400,000 $ 1,400,000
Lease term (in months) 12 months  
Goodwill $ 17,558,000 17,558,000
Impairment 0 0
Revenue recognized 1,300,000 1,100,000
Allowances for customer credits 111,000 84,000
Revenue recognized but not yet invoiced (unbilled AR) 1,500,000 2,100,000
Deferred revenue $ 1,200,000 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 $ 700,000 $ 900,000
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 5,367 3,766
Restricted Stock | Class B    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Anti-dilutive shares | shares 720 1,105
Restricted Stock Units    
Description Of Business And Summary Of Significant Accounting Policies And Practices [Line Items]    
Anti-dilutive shares | shares 63 535
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 $ 300,000 $ 200,000
Amortization associated with deferred contract costs $ 1,600,000 $ 1,500,000
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