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Leases - Schedule of Supplemental Cash Flow Information (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash used in operating activities        
Operating leases $ 439,595      
Finance leases 41,778      
Cash used in financing activities        
Finance leases 235,600 $ 107,871 $ 292,722 $ 205,085
ROU assets obtained in exchange for lease obligations        
Finance leases $ 355,536