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Description of Business and Significant Accounting Policies (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
item
Jun. 30, 2019
USD ($)
item
Jun. 30, 2020
USD ($)
segment
item
Jun. 30, 2019
USD ($)
item
Dec. 31, 2019
USD ($)
Description Of Business And Significant Accounting Policies [Line Items]          
AAA-rated money market funds $ 51,800,000   $ 51,800,000    
Number of Money Market Funds | item 2   2    
Accounts receivable, allowance $ 472,000   $ 472,000   $ 412,000
Bad Debt Expense     $ 94,000    
Number of reportable segments | segment     1    
Other income (expense)-net          
Description Of Business And Significant Accounting Policies [Line Items]          
Foreign currency (loss)/gain $ (20,000) $ 18,000 $ (425,000) $ (193,000)  
Customer concentration risk | Reseller | Total revenue          
Description Of Business And Significant Accounting Policies [Line Items]          
Concentration risk, number of resellers | item   1   1  
Concentration risk, percentage   10.00%   10.00%  
Customer concentration risk | Reseller | Net accounts receivable          
Description Of Business And Significant Accounting Policies [Line Items]          
Concentration risk, number of resellers | item     1    
Concentration risk, percentage     10.00%