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Debt - Insurance Premium Financing (Details) - USD ($)
1 Months Ended 9 Months Ended
May 31, 2020
Sep. 30, 2020
Dec. 31, 2016
Short-term Debt [Line Items]      
Principal amount     $ 12,500,000
Insurance Premium Financing      
Short-term Debt [Line Items]      
Principal amount $ 873,000    
Debt term 9 months    
Interest rate (as a percent) 4.15%    
Outstanding balance   $ 582,000  
Principal and interest paid on debt   $ 193,000