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Basis of Presentation - Additional Information (Detail) (USD $)
0 Months Ended 9 Months Ended
Aug. 15, 2014
Sep. 30, 2014
Basis Of Presentation [Line Items]    
Issue of common stock in a private placement   $ 5,291,000
Cash, cash equivalents and short term investments   12,700,000
Private Placement [Member]
   
Basis Of Presentation [Line Items]    
Issue of common stock in a private placement $ 5,300,000 $ 5,300,000