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Leases - Components of lease expense (Details)	3 Months Ended
	Mar. 31, 2019 USD ($)
Components of lease expense
Operating lease cost	$ 231,989
Variable lease cost	91,758
Total operating lease cost	323,747
Related cash flows
Operating cash flows from operating leases	$ 253,387

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- References

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- Definition

Amount of lease cost recognized by lessee for lease contract.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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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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