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Leases - Components of lease expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of lease expense
Operating lease cost	$ 231,989	$ 231,989	$ 695,968	$ 695,968
Variable lease cost	146,421	144,009	344,450	449,964
Total operating lease cost	378,410	375,998	1,040,418	1,145,932
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$ 271,383	$ 264,764	$ 804,599	$ 784,975

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Amount of lease cost recognized by lessee for lease contract.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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