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Leases - Maturities of lease liability (Details) - USD ($)
Sep. 30, 2019
Jan. 01, 2019
Maturities of lease liability due    
October 1, 2019 - December 31, 2019 $ 259,722  
2020 1,052,580  
2021 1,078,895  
2022 1,105,867  
2023 846,825  
Thereafter  
Total 4,343,889  
Present value adjustment (622,637)  
Present value of lease payments $ 3,721,252 $ 4,300,000