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Revenue Recognition - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Disaggregation Of Revenue [Line Items]            
Revenue disaggregated by service type $ 26,492,000 $ 24,794,000 $ 77,124,000 $ 77,541,000    
Allowance for advertiser credits 280,000   280,000   $ 370,000 $ 346,000
Deferred revenue 1,500,000   1,500,000   1,200,000 $ 1,800,000
Revenue recognized 166,000 367,000 $ 974,000 1.2    
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 216,000   $ 216,000   $ 287,000  
Amortization associated with deferred contract costs 72,000   $ 229,000      
Maximum | Customer Contracts            
Disaggregation Of Revenue [Line Items]            
Threshold amortization period when company obtains a contact     1 year      
Advertising Services            
Disaggregation Of Revenue [Line Items]            
Revenue disaggregated by service type 25,800,000 23,800,000 $ 75,000,000.0 74,300,000    
Local Leads Revenue            
Disaggregation Of Revenue [Line Items]            
Revenue disaggregated by service type $ 645,000 $ 956,000 $ 2,100,000 $ 3,300,000