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Segment and Enterprise-Wide Disclosures - Net Sales to Unaffiliated Customers by Geography (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]        
Net sales $ 18,161 $ 15,951 $ 34,915 $ 31,333
United States [Member]
       
Segment Reporting Information [Line Items]        
Net sales 10,615 9,579 20,616 19,314
Germany [Member]
       
Segment Reporting Information [Line Items]        
Net sales 1,882 1,802 3,762 3,361
Japan [Member]
       
Segment Reporting Information [Line Items]        
Net sales 567 610 1,123 1,169
Other Countries [Member]
       
Segment Reporting Information [Line Items]        
Net sales $ 5,097 $ 3,960 $ 9,414 $ 7,489