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Leases - Components of lease expense (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Components of lease expense
Operating lease cost	$ 231,989	$ 232,036	$ 463,979	$ 464,026
Variable lease cost	144,009	84,723	305,955	176,481
Total operating lease cost	375,998	316,759	769,934	640,507
Related cash flows
Operating cash flows from operating leases	$ 260,489	$ 255,493	$ 520,211	$ 508,880

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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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