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Balance Sheet Details - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Balance Sheet Details [Line Items]      
Marketable securities held at bank $ 11,700,000 $ 11,700,000  
Amount borrowed against the facility 3,000,000 10,000,000  
Outstanding borrowings under the credit facility 1,600,000 1,600,000  
Restricted marketable securities 1,583,000 1,583,000 0
Investments in marketable securities with unrealized loss position 0 0 0
Product warranty description   One to three years of coverage for products following the date of purchase  
Minimum [Member]
      
Balance Sheet Details [Line Items]      
Net unrealized loss 24,000 24,000  
Product warranty period   1 year  
Maximum [Member]
      
Balance Sheet Details [Line Items]      
Net unrealized loss $ 36,000 $ 36,000  
Product warranty period   3 years