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Summary of Outstanding Warrants Issued (Detail) - $ / shares
12 Months Ended
Dec. 31, 2015
Aug. 14, 2013
Nov. 30, 2010
Class Of Warrant Or Right [Line Items]      
Shares Issuable Pursuant to the Exercise of Warrants 371,878    
Weighted Average Exercise Price   $ 10.00 $ 26.50
Consultant Warrant      
Class Of Warrant Or Right [Line Items]      
Shares Issuable Pursuant to the Exercise of Warrants 85,000    
Weighted Average Exercise Price $ 10.70    
Issue Date Aug. 13, 2014    
Expiration Date Aug. 13, 2019    
Opus Warrant      
Class Of Warrant Or Right [Line Items]      
Shares Issuable Pursuant to the Exercise of Warrants 100,000    
Weighted Average Exercise Price $ 9.90    
Issue Date Mar. 31, 2014    
Expiration Date Mar. 31, 2019    
2013 Private Placement Warrants      
Class Of Warrant Or Right [Line Items]      
Shares Issuable Pursuant to the Exercise of Warrants 186,878    
Weighted Average Exercise Price $ 10.00    
Issue Date Aug. 14, 2013    
Expiration Date Aug. 14, 2017