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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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