Revenue - Additional Information (Detail) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Contract liabilities	$ 3,342,000	$ 2,807,000
Contract with customer assets	977,000	1,124,000
Accounts receivables	$ 483,561	$ 1,129,572

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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