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Segment, Customer and Geographic Information - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2013
Segment
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]        
Number of operating segments   1    
Government grants and cooperative agreements revenue $ 91 $ 0 $ 91 $ 2,442
Government Grants And Cooperative Agreements
       
Segment Reporting Information [Line Items]        
Government grants and cooperative agreements revenue   $ 0    
Government Grants And Cooperative Agreements | Total Revenue
       
Segment Reporting Information [Line Items]        
Company's total product revenue from significant customers     1.00% 7.00%