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Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Customer | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |
Gross deferred revenue | $ 3,820,000 | $ 5,015,000 | $ 3,820,000 | $ 5,015,000 |  |  |
Gross deferred cost of revenue |  | 2,135,000 |  | 2,135,000 |  |  |
Foreign currency gains (losses) |  |  | $ (260,000) | 323,000 | $ (268,000) |  |
Maturity period of cash and cash equivalents |  |  | Less than three months |  |  |  |
Available-for-sale securities, failed auction, value | $ 3,000,000 |  | $ 3,000,000 |  |  |  |
Number of customers accounted for trade account receivable | Customer | 1 |  | 1 |  |  |  |
Cost of advertising |  |  | $ 2,610,000 | 2,150,000 | $ 1,818,000 |  |
Percentage likelihood of tax benefit settlement |  |  | 50.00% |  |  |  |
Retained Earnings (Accumulated Deficit) | $ 129,000,000 | 93,605,000 | $ 129,000,000 | $ 93,605,000 |  |  |
Finance Lease, Liability |  |  |  |  |  | $ 4,500,000 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |
Gross deferred revenue | (1,195,000) |  | (1,195,000) |  |  |  |
Deferred revenue current |  |  | 991,000 |  |  |  |
Accounting Standards Update 2014-09 [Member] | Adjustments [Member] |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) | (5,408,000) |  | $ (5,408,000) |  |  |  | $ 3,670,000
Increase in revenue | $ 14,949 | $ 14,949 |  |  |  |  |
Customer One [Member] |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |
Percentage of trade account receivable |  |  | 14.30% | 17.50% |  |  |
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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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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