Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Schedule of Cash and Cash Equivalents (Detail)

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Significant Accounting Policies - Schedule of Cash and Cash Equivalents (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Cash and Cash Equivalents [Abstract]        
Cash $ 218,084 $ 10,974    
Money market funds 9,025,069 6,251,471    
Cash and cash equivalents $ 9,243,153 $ 6,262,445 $ 8,504,172 $ 303,020