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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 |  |

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- Definition The amount of expense recognized in the current period for the periodic realization of capitalized fees that were paid to salespeople, distributors, brokers, and agents at the time of the conclusion of the sale. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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