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Leases - Components of lease expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Components of lease expense
Operating lease cost	$ 231,989	$ 231,989	$ 463,979	$ 463,979
Variable lease cost	51,608	144,009	198,029	305,955
Total operating lease cost	283,597	375,998	662,008	769,934
Related cash flows
Operating cash outflows from operating leases	$ 267,001	$ 260,489	$ 533,216	$ 520,211

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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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