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Summary of Significant Accounting Policies (Narrative) (Details) - ASC 606 [Member]
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
Jun. 30, 2020
USD ($)
Segment
Jun. 30, 2019
Summary Of Significant Accounting Policies [Line Items]        
Number of reporting segment | Segment     1  
Percentage of service revenue that is recognized over a period of time against total revenue     0.00%  
Deferred revenue | $ $ 5,500   $ 5,500  
Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Revenues Specific To One Customer 12.00% 11.00% 15.00% 12.00%