Leases - Lease costs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases
Operating lease expense	$ 245,615	$ 34,801	$ 293,289	$ 70,151
Short-term lease expense	95,254	18,044	123,716	35,047
Total lease cost	$ 340,869	$ 52,845	$ 417,005	$ 105,198