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Stockholders' Equity - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
May. 15, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Equity [Abstract]            
Preferred stock, shares authorized   10,000,000   10,000,000   10,000,000
Preferred stock, par value   $ 0.001   $ 0.001   $ 0.001
Preferred stock, shares issued   0   0   0
Preferred stock, shares outstanding   0   0   0
Common stock, shares authorized   200,000,000   200,000,000   200,000,000
Common stock, par value   $ 0.001   $ 0.001   $ 0.001
Common stock, shares issued   111,714,938   111,714,938   111,601,304
Common stock, shares outstanding   111,714,938   111,714,938   111,601,304
Employee stock purchase plan expense   $ 17,723 $ 0 $ 54,647 $ 0  
Shares issued for Employee Stock Purchase Plan options, Shares 57,134     57,134