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