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Significant Accounting Policies - Schedule of Cash and Cash Equivalents (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash And Cash Equivalents [Abstract]      
Cash $ 255,943 $ 10,974  
Money market fund 12,082,332 6,251,471  
Cash and cash equivalents $ 12,338,275 $ 6,262,445 $ 303,020