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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Country
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Accounting Policies [Line Items]      
Number of Countries in which Entity Operates 14    
Loss on foreign currency transactions $ 624 $ 410 $ 760
Percent of renewals within median VSOE range 80.00%    
Range within median renewal percentage rate 15.00%    
Software development costs were capitalized $ 0 $ 0 $ 0
Patents [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of assets 20 years    
DigiNotar B.V. [Member]
      
Schedule Of Accounting Policies [Line Items]      
Percentage of stock acquired by the company 100.00%    
Minimum [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of assets 3 years    
Warranty for hardware purchase 1 year    
Extended product warranty period 1 year    
Minimum [Member] | Software Development Costs [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated economic life of product 2 years    
Minimum [Member] | Proprietary Technology [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of assets 3 years    
Maximum [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of assets 7 years    
Warranty for hardware purchase 2 years    
Extended product warranty period 4 years    
Maximum [Member] | Software Development Costs [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated economic life of product 5 years    
Maximum [Member] | Proprietary Technology [Member]
      
Schedule Of Accounting Policies [Line Items]      
Estimated useful lives of assets 7 years