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Leases - Components of lease expense (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Components of lease expense    
Operating lease cost $ 231,989 $ 695,968
Variable lease cost 148,353 324,834
Total operating lease cost 380,342 1,020,802
Related cash flows    
Operating cash flows from operating leases $ 259,014 $ 767,894