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Revenue Recognition - Additional Information (Detail) - USD ($) |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation Of Revenue [Line Items] |  |  |
Revenue disaggregated by service type |  | $ 26,406,000 | $ 21,896,000
Revenue recognozed |  | $ 349,000 |
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 |  | $ 247,000 |
Amortization associated with deferred contract costs |  | $ 108,000 |
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 |  | $ 25,200,000 | 19,900,000
Local Leads Revenue |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Revenue disaggregated by service type |  | $ 1,200,000 | $ 2,000,000
ASC 606 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Decrease to accumulated deficit for cumulative impact of adoption | $ 189,000 |  |

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