v3.3.1.900
The Company and Summary of Significant Accounting Policies (Details)
€ in Millions, £ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2015
GBP (£)
customer
contract
Dec. 31, 2015
EUR (€)
customer
contract
Dec. 31, 2015
USD ($)
customer
contract
Dec. 31, 2014
GBP (£)
customer
Dec. 31, 2014
EUR (€)
customer
Dec. 31, 2014
USD ($)
customer
Goodwill and Intangible Assets                    
Impairment of intangible assets   $ 255,000 $ 0 $ 0            
Software Development Costs                    
Capitalized software development costs   99,000 98,000 0            
Cost of intangible assets             $ 3,469,000     $ 3,469,000
Accumulated amortization of intangible assets             $ 2,149,000     1,763,000
Derivative Financial Instruments                    
Derivative, number of instruments held | contract         2 2 2      
Foreign currency contract, asset, fair value disclosure             $ 0     0
Foreign currency transaction loss, before tax   1,000,000 1,400,000              
Advertising Expenses                    
Advertising expense   6,100,000 5,300,000 4,200,000            
Foreign exchange losses   $ (444,000) (664,000) $ (679,000)            
Income Taxes                    
Noncurrent deferred tax assets             16,079,000     22,639,000
Effect of early adoption of accounting guidance                    
Income Taxes                    
Current deferred tax assets                   (8,500,000)
Noncurrent deferred tax assets                   8,500,000
Minimum                    
Property Equipment, Net                    
Property, plant and equipment, useful life   3 years                
Goodwill and Intangible Assets                    
Finite-lived intangible asset, useful life 3 years                  
Maximum                    
Property Equipment, Net                    
Property, plant and equipment, useful life   5 years                
Goodwill and Intangible Assets                    
Finite-lived intangible asset, useful life 14 years                  
Scanner appliances                    
Property Equipment, Net                    
Property, plant and equipment, useful life   3 years                
Forward contracts                    
Derivative Financial Instruments                    
Derivative, notional amount         £ 2.6 € 6.1   £ 2.1 € 6.0  
Foreign currency contract, asset, fair value disclosure             0     0
Derivative instruments not designated as hedging instruments, gain   $ 600,000 $ 700,000              
Software and software development costs                    
Software Development Costs                    
Cost of intangible assets             400,000     300,000
Accumulated amortization of intangible assets             $ 300,000     $ 300,000
Customer concentration risk | Accounts receivable                    
Concentration of Credit Risk                    
Concentration risk, number of customers | customer         0 0 0 0 0 0