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Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 Customer Distributor | Dec. 31, 2012 Customer | Dec. 31, 2011
Revenue, Major Customer [Line Items] |  |  |
Number of distributors | 2 |  |
Gross deferred revenue | $ 1,269,000 | $ 625,000 |
Gross deferred cost of revenue | 516,000 | 249,000 |
Revenue recognized under multi-element | 3.00% | 3.00% | 3.00%
Foreign currency losses, net | (94,000) | (46,000) | (326,000)
Maturity period of cash and cash equivalents | less than three months |  |
Auction rate securities | 6,000,000 |  |
Number of customers accounted for trade account receivable | 2 | 2 |
Number of customers | 2 |  |
Cost of advertising | $ 1,884,000 | $ 1,910,000 | $ 1,645,000
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] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues |  | 10.10% | 14.90%
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 59.50% | 51.10% | 56.90%
Hong Kong [Member] | Sales Revenue, Net [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 16.20% | 12.50% | 11.80%
CHINA | Sales Revenue, Net [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 11.30% |  |
TAIWAN, PROVINCE OF CHINA | Sales Revenue, Net [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues |  | 9.00% | 15.30%
Customer One [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of trade account receivable | 12.90% | 12.70% |
Customer One [Member] | Sales Revenue, Net [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 | 12.50% | 10.60% |
Customer Two [Member] | Sales Revenue, Net [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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