Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Additional Information (Detail)

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Stockholders' Equity - Additional Information (Detail) (USD $)
9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Stockholders Equity [Line Items]    
Common stock, shares issued 36,623,781 36,600,897
Common stock, shares outstanding 36,623,781 36,600,897
Common stock share, par value $ 0.0001 $ 0.0001
Preferred stock, shares authorized 25,000,000 25,000,000
Preferred stock, par value $ 0.0001 $ 0.0001
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Restricted Stock [Member] | Non-employee directors [Member]
   
Stockholders Equity [Line Items]    
Common stock issued 52,884 30,000