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Stockholders' Equity - Additional Information - Warrants (Detail) - shares
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
May. 28, 2014
May. 07, 2014
Apr. 18, 2014
Schedule Of Stockholders Equity [Line Items]          
Warrants issued 0 0 1,650,000 200,000 1,441,000
Number of exercised warrants 0        
Number of warrants expired   0      
Warrants outstanding 11,791,000        
Contingent Warrants [Member]          
Schedule Of Stockholders Equity [Line Items]          
Warrants forfeited 1,200,000        
Exercisable Warrants [Member]          
Schedule Of Stockholders Equity [Line Items]          
Warrants outstanding 11,791,000