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Supplemental lease information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]      
Right-of-use asset $ 9,757,167   $ 10,109,154
Short-term operating lease liability (included in Other current liabilities) 1,753,499   1,501,539
Long-term operating lease liability $ 8,782,274   $ 9,145,049
Operating Lease, Weighted Average Remaining Lease Term 9 years   9 years
Weighted average discount rate 8.25%   8.25%
Cash paid for amounts included in the measurement of lease liabilities for operating lease $ 327,386 $ 279,742  
Right-of-use assets obtained in exchange for lease obligation $ 3,760,171