v2.4.0.8
Property and Equipment, Net (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Property and equipment $ 57,927,000 $ 44,812,000  
Less: accumulated depreciation and amortization (34,852,000) (26,664,000)  
Property and equipment, net 23,075,000 18,148,000  
Capital lease 3,100,000 3,800,000  
Capital lease, accumulated depreciation 1,200,000 1,200,000  
Depreciation and amortization expense 9,200,000 6,900,000 4,900,000
Computer equipment
      
Property, Plant and Equipment [Line Items]      
Property and equipment 27,464,000 18,798,000  
Computer software
      
Property, Plant and Equipment [Line Items]      
Property and equipment 9,277,000 6,327,000  
Furniture, fixtures and equipment
      
Property, Plant and Equipment [Line Items]      
Property and equipment 2,031,000 1,545,000  
Scanner appliances
      
Property, Plant and Equipment [Line Items]      
Property and equipment 17,055,000 16,470,000  
Scanner appliances and other computer equipment subject to subscription
      
Property, Plant and Equipment [Line Items]      
Property and equipment, net 4,700,000 5,500,000  
Scanner appliances and other computer equipment not placed in service
      
Property, Plant and Equipment [Line Items]      
Property and equipment 600,000 1,500,000  
Leasehold improvements
      
Property, Plant and Equipment [Line Items]      
Property and equipment 2,100,000 1,672,000  
Other fixed assets not placed in service
      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 1,600,000 $ 1,700,000