Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business - Additional Information (Detail)

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Organization and Description of Business - Additional Information (Detail) (USD $)
0 Months Ended 1 Months Ended 9 Months Ended
Aug. 01, 2014
Aug. 31, 2014
Sep. 30, 2014
Organization And Description Of Business [Line Items]      
Net proceeds from initial public offering $ 35,000,000 $ 35,000,000 $ 41,281,998
Initial Public Offering [Member]
     
Organization And Description Of Business [Line Items]      
Securities converted into common stock   11,971,956