Annual report pursuant to Section 13 and 15(d)

Organization and Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.6
Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended
Mar. 31, 2010
Dec. 31, 2012
Customer
Segment
Product
Dec. 31, 2011
Dec. 31, 2010
Organization And Significant Accounting Policies [Line Items]        
Gross proceeds in the IPO $ 82,900,000      
Net proceeds after deducting underwriting discounts commissions and other offering costs 72,900,000     75,550,000
Underwriting discounts and commissions 5,800,000      
Other offering costs 4,200,000      
Liquid investments maturity   All liquid investments with a maturity of three months or less when purchased to be cash equivalents.    
Allowance for doubtful accounts   100,000    
Percentage of revenues from the Company's distributors   40.00% 71.00%  
Term of Invoice of the distributor   30 days    
Warranty period   1 year    
Accrual of warranty costs   $ 0 $ 0  
Number of segment   1    
Number of class of products   1    
Number of types of customers   1    
Minimum [Member]
        
Organization And Significant Accounting Policies [Line Items]        
Estimated useful lives of the assets   2 years    
Percentage representing net revenue by customers   Less than 10% of net revenue Less than 10% of net revenue Less than 10% of net revenue
Percentage representing accounts receivable   Less than 10% of accounts receivables Less than 10% of accounts receivables Less than 10% of accounts receivables
Maximum [Member]
        
Organization And Significant Accounting Policies [Line Items]        
Estimated useful lives of the assets   5 years    
Estimated useful life of intangible assets   3 years    
Percentage representing net revenue by customers   Greater than 10% of net revenue Greater than 10% of net revenue Greater than 10% of net revenue
Percentage representing net revenue by products shipped to international destinations   Greater than 10% of net revenue Greater than 10% of net revenue Greater than 10% of net revenue
Percentage representing accounts receivable   Greater than 10% of accounts receivable Greater than 10% of accounts receivable Greater than 10% of accounts receivable
Class A common stock [Member]
        
Organization And Significant Accounting Policies [Line Items]        
Common stock shares issued 5,900,000     5,920,000
Common stock at an issue price $ 14.00      
Class B common stock [Member]
        
Organization And Significant Accounting Policies [Line Items]        
Preferred stock converted to common stock 14,500,000