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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 USD ($) Customer | Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Revenue, Major Customer [Line Items] |  |  |  |  |
Operating leases right of use assets | $ 4,261,000 |  |  | $ 4,329,000 |
Operating Lease, Liability | 4,375,000 |  |  | $ 4,455,000 |
Foreign currency gains (losses) | $ (108,000) | $ (260,000) | $ 323,000 |  |
Maturity period of cash and cash equivalents | less than three months |  |  |  |
Available-for-sale securities, failed auction, value | $ 3,000,000 |  |  |  |
Number of customers accounted for trade account receivable | Customer | 1 | 1 |  |  |
Cost of advertising | $ 2,749,000 | $ 2,610,000 | $ 2,150,000 |  |
Percentage likelihood of tax benefit settlement | 50.00% |  |  |  |
Retained Earnings (Accumulated Deficit) | $ 143,098,000 | 129,000,000 |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Deferred revenue current | $ 76,000 | 991,000 |  |  |
Accounting Standards Update 2014-09 [Member] | Adjustments [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  | $ (5,408,000) |  |  | $ 3,670,000
Customer One [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Percentage of trade account receivable | 14.30% | 14.30% |  |  |
Maximum [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Estimated useful life of intangible assets | 20 years |  |  |  |
Customer Payments Period | 60 days |  |  |  |
Minimum [Member] |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |
Customer Payments Period | 30 days |  |  |  |

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