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Stockholders' Equity - Additional Information - Sale of Common Stock and Warrants (Detail) - USD ($)
 6 Months Ended
Apr. 18, 2014
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2014
May. 28, 2014
May. 07, 2014
Equity [Abstract]            
Warrant conversion, shares 1,192,500          
Warrant conversion, amount $ 2,385,000 $ 29,001        
Warrant to purchase common stock, per share $ 2.00          
Additional warrants issued to purchase common stock 248,500          
Common stock, shares issued 1,192,500   111,714,938 111,601,304    
Number of warrants issued to purchase of common stock 1,441,000 0 0   1,650,000 200,000