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Balance Sheet Details - Additional Information (Detail) (USD $)
 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Dec. 31, 2012
Oct. 31, 2013
Subsequent Event [Member]
Sep. 30, 2013
Minimum [Member]
Sep. 30, 2013
Maximum [Member]
Balance Sheet Details [Line Items]            
Net unrealized loss $ 10,000 $ 10,000        
Investments in marketable securities with unrealized loss position 0 0 0      
Marketable securities held at bank 9,200,000 9,200,000        
Amount borrowed against the facility 3,400,000 13,400,000        
Line of credit facility 2,400,000 2,400,000   3,500,000    
Restricted marketable securities $ 2,441,000 $ 2,441,000 $ 0      
Product warranty description   One to three years of coverage for products following the date of purchase        
Product warranty period         1 year 3 years