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Supplemental lease information (Details) - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]      
Right-of-use asset $ 10,337,577   $ 10,109,154
Short-term operating lease liability (included in Other current liabilities) 2,107,413   1,501,539
Long-term operating lease liability $ 9,307,361   $ 9,145,049
Weighted average remaining term 9 years   9 years
Weighted average discount rate 8.30%   8.25%
Cash paid for amounts included in the measurement of lease liabilities for operating lease $ 670,793 $ 564,092  
Right-of-use assets obtained in exchange for lease obligation $ 998,821 $ 3,760,171