Revenue - Additional Information (Detail) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Contract liabilities	$ 2,229,000	$ 3,845,000
Accounts receivables	$ 1,051,228	$ 1,319,156

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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