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Leases - Components of lease expense (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Components of lease expense    
Operating lease cost $ 232,036 $ 464,026
Variable lease cost 84,723 176,481
Total operating lease cost 316,759 640,507
Related cash flows    
Operating cash flows from operating leases $ 255,493 $ 508,880