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Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
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