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Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 USD ($) Customer | Dec. 31, 2013 USD ($) Customer
Revenue, Major Customer [Line Items] |  |  |
Gross deferred revenue | $ 2,042,000 | $ 1,769,000 |
Gross deferred cost of revenue | $ 882,000 | $ 808,000 |
Revenue recognized under multi-element | 3.00% | 3.00% | 3.00%
Foreign currency losses, net | $ (161,000) | $ (196,000) | $ (94,000)
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 | 2 |
Number of customers | Customer | 1 | 1 | 2
Cost of advertising | $ 1,762,000 | $ 1,832,000 | $ 1,884,000
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 | 16.20% | 14.70% |
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 59.60% | 60.50% | 59.50%
Sales Revenue, Net [Member] | Hong Kong [Member] | Geographic Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 21.80% | 20.20% | 16.20%
Sales Revenue, Net [Member] | China [Member] | Geographic Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 12.40% | 12.00% | 11.30%
Customer One [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of trade account receivable | 21.90% | 14.90% |
Customer One [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues |  |  | 10.90%
Customer Two [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of trade account receivable |  | 11.60% |
Customer Two [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues |  |  | 10.10%
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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