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Stockholders' Equity - Additional Information - Restricted Stock Units (Detail) - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Schedule Of Stockholders Equity [Line Items]        
Stock-based compensation expense     $ 0  
Shares issued for vested restricted stock units, Shares   56,500    
Potentially dilutive securities include options, restricted stock units, warrants, and convertible promissory notes   16,908,173 19,287,215  
Restricted Stock Units [Member]        
Schedule Of Stockholders Equity [Line Items]        
Fair value of restricted stock unit   $ 3.75    
Fair value of restricted stock unit, forfeiture rate   0.00%    
Stock-based compensation expense   $ 0    
Potentially dilutive securities include options, restricted stock units, warrants, and convertible promissory notes   76,100   132,600
2012 Incentive Compensation Plan [Member] | Restricted Stock Units [Member]        
Schedule Of Stockholders Equity [Line Items]        
Shares granted 132,600