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Summary of Significant Accounting Policies - Schedule of Anti-dilutive Securities (Detail) - shares
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Class of Stock [Line Items]    
Anti-dilutive securities 7,133,606 5,515,547
Options [Member]    
Class of Stock [Line Items]    
Anti-dilutive securities 27,831 230,464
Restricted Stock Units [Member]    
Class of Stock [Line Items]    
Anti-dilutive securities 206,934 779,881
Warrants [Member]    
Class of Stock [Line Items]    
Anti-dilutive securities 6,898,841 4,505,202