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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2021 USD ($) Customer | Dec. 31, 2020 USD ($) Customer | Dec. 31, 2019 USD ($)
Revenue, Major Customer [Line Items] |  |  |
Foreign currency gains (losses) | $ (336,000) | $ 181,000 | $ (108,000)
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 | $ 2,994,000 | $ 2,637,000 | $ 2,749,000
Percentage likelihood of tax benefit settlement | 50.00% |  |
Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Deferred revenue current | $ 4,087,000 | $ 3,550,000 |
Customer One [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of trade account receivable | 10.00% | 24.10% |
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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