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Summary of Significant Accounting Policies (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
Sep. 30, 2021
USD ($)
Segment
Sep. 30, 2020
Summary Of Significant Accounting Policies [Line Items]        
Percentage of revenue specific to customer from net revenue 6.00% 8.00% 9.00% 12.00%
ASC 606 [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Number of reporting segment | Segment     2  
Deferred revenue | $ $ 104,000   $ 104,000  
ASC 606 [Member] | Maximum [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Percentage of service revenue that is recognized over a period of time against total revenue     1.00%