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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)
May. 07, 2015
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
May. 28, 2014
May. 07, 2014
Apr. 18, 2014
Class Of Warrant Or Right [Line Items]              
Number of warrants issued to purchase of common stock   0   0 1,650,000 200,000 1,441,000
Warrants Vested 100,000         100,000  
Warrant liability during the period   $ 0 $ 34,857        
Reclassification of fair value warrants to equity $ 35,001            
Black-Scholes-Merton Valuation Model [Member]              
Class Of Warrant Or Right [Line Items]              
Fair value assumption, expected volatility 88.50%            
Fair value assumption, risk free interest rate 0.63%            
Fair value assumption, expected term 2 years            
Fair value assumption, expected dividend yield 0.00%            
Grant date fair value of the initial warrant valuation $ 0.35