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Revenue Recognition - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation Of Revenue [Line Items]          
Allowance for advertiser credits $ 227,000   $ 227,000   $ 219,000
Deferred revenue 1,300,000   1,300,000   1,400,000
Revenue recognized 176,000 $ 166,000 $ 1,300,000 $ 974,000  
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.    
Customer Relationships          
Disaggregation Of Revenue [Line Items]          
Estimated life     24 months    
Customer Contracts          
Disaggregation Of Revenue [Line Items]          
Deferred contract costs, net $ 122,000   $ 122,000   167,000
Amortization associated with deferred contract costs     $ 1,100,000   $ 989,000
Maximum | Customer Contracts          
Disaggregation Of Revenue [Line Items]          
Threshold amortization period when company obtains a contact     1 year