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Leases - Cash flows of operating lease liabilities (Details) - USD ($)
Sep. 30, 2019
Jan. 01, 2019
Leases    
2019 (excluding the quarters ended September 30, 2019) $ 4,050  
2020 18,550  
Total minimum lease payments 22,600  
Lease amount representing interest (600)  
Total lease liabilities $ 22,000 $ 53,000