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Significant Accounting Policies - Schedule of Cumulative Effect of Changes on Consolidated Balance Sheet for Adoption of ASC 606 (Detail) - USD ($)	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Current Assets
Trade and other receivables	$ 2,888,496	$ 3,286,147	$ 3,853,992
Other current assets	134,301	293,664
Liabilities
Deferred income	5,191,654	4,432,056	4,362,056
Stockholders' equity
Retained earnings	$ 80,849,086	$ 93,125,606	93,469,787
Accounting Standards Update 2014-09 [Member]
Current Assets
Trade and other receivables			(567,845)
Other current assets			293,664
Liabilities
Deferred income			70,000
Stockholders' equity
Retained earnings			$ (344,181)

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Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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