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Liquidity and Financial Condition - Additional Information (Detail) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Dec. 31, 2014
Variable Interests And Equity Method Investments Disclosure [Abstract]        
Cash and cash equivalents $ 5,178,076 $ 14,178,902 $ 18,883,662 $ 17,391,601