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Description of Business and Significant Accounting Policies (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
segment
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Description Of Business And Significant Accounting Policies [Line Items]      
AAA-rated money market funds $ 82,400,000    
Number of Money Market Funds | item 5    
Balance at Beginning of Period $ 425,000 $ 475,000 $ 433,000
Bad Debt Expense   199,000 149,000
Write-offs, Net of Recoveries (13,000) (249,000) (107,000)
Balance at End of Period $ 412,000 425,000 475,000
Number of reportable segments | segment 1    
Other income (expense)—net      
Description Of Business And Significant Accounting Policies [Line Items]      
Foreign currency (loss)/gain $ (594,000) $ (471,000) $ 242,000
Customer concentration risk | Reseller | Total revenue      
Description Of Business And Significant Accounting Policies [Line Items]      
Concentration risk, percentage 10.00% 11.00% 14.00%
Customer concentration risk | Reseller | Net accounts receivable      
Description Of Business And Significant Accounting Policies [Line Items]      
Concentration risk, percentage 5.00% 7.00%  
Customer concentration risk | As an end customer | Total revenue      
Description Of Business And Significant Accounting Policies [Line Items]      
Concentration risk, percentage 1.00% 1.00% 1.00%