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Components of leases expense (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($)
Operating lease cost	$ 1,102,684
Finance lease cost
Amortization of lease expense	25,150
Interest on lease liabilities	4,579
Sublease income	(100,180)
Total finance lease cost, net	$ 1,032,233

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Amount of interest expense on finance lease liability.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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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 sublease income excluding finance and operating lease expense.

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