Revenue Recognition - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Disaggregation Of Revenue [Line Items]
Allowance for advertiser credits	$ 169,000		$ 169,000		$ 157,000
Deferred revenue	1,500,000		1,500,000		2,000,000.0
Revenue recognized	219,000	$ 392,000	$ 643,000	$ 1.1
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	$ 84,000		$ 84,000		128,000
Amortization associated with deferred contract costs			$ 1,400,000		$ 1,200,000
Maximum | Customer Contracts
Disaggregation Of Revenue [Line Items]
Threshold amortization period when company obtains a contact			1 year