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The Company and Summary of Significant Accounting Policies (Details)
£ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
GBP (£)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
GBP (£)
segment
Dec. 31, 2018
USD ($)
customer
Dec. 31, 2017
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2018
USD ($)
Jan. 01, 2017
USD ($)
The company and qualitative disclosure about market risk [Line Items]                        
Number of operating segments (in segment)         1   1          
Payments to Acquire Investments           $ 625,000            
Retained earnings               $ 27,964,000   $ 23,194,000    
Capitalized Computer Software, Gross     $ 400,000         1,300,000 $ 400,000 1,000,000.0    
Capitalized Computer Software, Unamortized               1,200,000   2,000,000.0    
General and administrative           40,765,000   39,049,000 35,334,000      
Cost of revenues           69,517,000   66,185,000 51,580,000      
Research and development           68,239,000   53,255,000 42,816,000      
Sales and marketing           70,833,000   70,039,000 63,855,000      
Goodwill and Intangible Assets                        
Finite-lived intangible asset, useful life       3 years                
Software Development Costs                        
Capitalized software development costs                 0      
Cost of intangible assets               26,844,000   27,743,000    
Accumulated amortization of intangible assets               4,907,000   10,988,000    
Derivative Financial Instruments                        
Derivative, notional amount | £       £ 4.8 £ 4.8   £ 4.8          
Total foreign exchange loss, net           (354,000)   (577,000) (355,000)      
Advertising Expenses                        
Advertising expense           74,000   87,000 482,000      
Income Taxes                        
Tax Cuts and Jobs Act of 2017, Provisional income tax expense (benefit)     10,400,000                  
Noncurrent deferred tax assets               26,387,000   18,830,000    
Provision for (benefit from) income taxes           $ 10,647,000   (1,836,000) (1,062,000)      
Restricted cash               1,200,000   1,200,000    
Operating Lease, Right-of-Use Asset               $ 0   40,551,000    
Operating lease, liability                   51,678,000    
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                
Customer concentration risk | Accounts receivable                        
Concentration of Credit Risk                        
Concentration risk, number of customers | customer               0        
Accounting Standards Update 2016-09                        
Income Taxes                        
Cumulative effect adjustment                       $ 7,745,000
Accounting Standards Update 2016-09 | Retained earnings                        
Income Taxes                        
Cumulative effect adjustment                       $ 7,745,000
Accounting Standards Update 2014-09                        
Income Taxes                        
Cumulative effect adjustment                     $ 2,711,000  
Accounting Standards Update 2014-09 | Retained earnings                        
Income Taxes                        
Cumulative effect adjustment                     $ 2,711,000  
Deferred Compensation, Share-based Payments [Member]                        
The company and qualitative disclosure about market risk [Line Items]                        
Capitalized Computer Software, Gross     $ 0         $ 200,000 $ 0 $ 200,000    
privately-held companies [Member] | Preferred Stock                        
The company and qualitative disclosure about market risk [Line Items]                        
Payments to Acquire Investments   $ 600,000           $ 2,500,000        
privately-held companies [Member] | Convertible Debt Securities [Member]                        
The company and qualitative disclosure about market risk [Line Items]                        
Payments to Acquire Investments $ 600,000