Supplemental lease information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Aug. 31, 2019	Jan. 02, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Operating Lease, Right-of-Use Asset	$ 10,459,635	$ 7,400,000	$ 3,800,000
Operating Lease, Liability, Current	1,242,290
Operating Lease, Liability, Noncurrent	$ 9,500,133
Operating Lease, Weighted Average Remaining Lease Term	9 years
Operating Lease, Weighted Average Discount Rate, Percent	8.25%
Operating Lease, Payments	$ 849,440
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 11,171,471