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Commitments and Contingencies - Operating Leases (Detail)
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
sqft
Bedford, Massachusetts
   
Operating Leased Assets [Line Items]    
Lease expiration date 2014-09  
Billerica Massachusetts [Member]
   
Operating Leased Assets [Line Items]    
Lease expiration date 2014-09  
Woburn, Massachusetts
   
Operating Leased Assets [Line Items]    
Lease expiration date 2014-12  
Singapore
   
Operating Leased Assets [Line Items]    
Lease expiration date 2015-07  
FLORIDA
   
Operating Leased Assets [Line Items]    
Lease expiration date 2014-12  
New York State
   
Operating Leased Assets [Line Items]    
Lease expiration date 2015-04  
Billerica Massachusetts, New Location [Member]
   
Operating Leased Assets [Line Items]    
Area of Real Estate Property   90,000
Lease expiration date 2022-10