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Summary of Significant Accounting Policies - Concentrations of Credit and Other Risks (Details) - Customer Concentration Risk
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Revenue          
Concentration Risk [Line Items]          
Concentration risk percentage 13.00% 12.00% 14.00% 12.00%  
Two Customers | Accounts Receivable          
Concentration Risk [Line Items]          
Concentration risk percentage         10.00%
One Customer [Member] | Accounts Receivable          
Concentration Risk [Line Items]          
Concentration risk percentage     10.00%