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Significant Accounting Policies - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2017 | Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 USD ($) Customer
Revenue, Major Customer [Line Items] |  |  |  |
Gross deferred revenue |  | $ 3,337,000 | $ 2,042,000 |
Gross deferred cost of revenue |  | $ 1,445,000 | $ 882,000 |
Revenue recognized under multi-element |  | 3.00% | 3.00% | 3.00%
Foreign currency losses, net |  | $ (268,000) | $ (161,000) | $ (196,000)
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 |
Number of customers | Customer |  | 1 | 1 | 1
Cost of advertising |  | $ 1,818,000 | $ 1,762,000 | $ 1,832,000
Product warranty period |  | 2 years |  |
Percentage likelihood of tax benefit settlement |  | 50.00% |  |
Recognition period of non performance based stock options |  | 5 years |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of total net revenues |  | 16.40% | 16.20% | 14.70%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of total net revenues |  | 59.40% | 59.60% | 60.50%
Sales Revenue, Net [Member] | China [Member] | Geographic Concentration Risk [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of total net revenues |  | 32.10% | 34.20% | 32.30%
Military Grade Products [Member] | Subsequent Event [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Extended warranty period | 3 years |  |  |
Customer One [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Percentage of trade account receivable |  | 14.20% | 21.90% |
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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