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Stockholders' Equity - Schedule of Common Stock Shares Issued (Detail) - USD ($)
 6 Months Ended
May. 15, 2015
Apr. 18, 2014
Jun. 30, 2015
Jun. 30, 2014
Equity [Abstract]        
Shares issued for vested restricted stock units, Shares     56,500  
Shares issued for Employee Stock Purchase Plan options, Shares 57,134   57,134  
Sale of common stock and warrants, common stock Shares       1,192,500
Shares issued upon conversion of note, Shares       23,201
Common stock issued for services, Shares     0 20,408
Total common stock shares     113,634 1,236,109
Shares issued for Employee Stock Purchase Plan options, Value     $ 60,705  
Sale of common stock and warrants, Amount       $ 2,385,000
Shares issued upon conversion of note, Amount   $ 2,385,000   29,001
Common stock issued for services, Value       50,000
Total common stock amount     $ 60,705 $ 2,464,001