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Significant Accounting Policies - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 USD ($)
Revenue, Major Customer [Line Items] |  |  |  |
Gross deferred revenue |  | $ 4,659,000 | $ 3,337,000 |
Gross deferred cost of revenue |  | $ 2,135,000 | $ 1,445,000 |
Revenue recognized under multi-element |  | 3.00% | 3.00% | 3.00%
Foreign currency gains (losses) |  | $ 323,000 | $ (268,000) | $ (161,000)
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 |  | $ 2,150,000 | $ 1,818,000 | $ 1,762,000
Product warranty period |  | 2 years |  |
Percentage likelihood of tax benefit settlement |  | 50.00% |  |
Recognition period of non performance based stock options |  | 5 years |  |
Military Grade Products [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Extended warranty period | 3 years |  |  |
Customer One [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of trade account receivable |  | 17.50% | 14.20% |
Maximum [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Recognition period |  | 12 months |  |
Estimated useful life of intangible assets |  | 20 years |  |
Minimum [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Recognition period |  | 6 months |  |
Estimated useful life of intangible assets |  | 3 years |  |

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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.3) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780 + Details
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