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Summary of Warrant Activity (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2017
Apr. 12, 2017
Dec. 31, 2016
Warrants And Rights Note Disclosure [Abstract]      
Number of Shares Underlying Warrants, Outstanding 12,039    
Number of Shares Underlying Warrants, Issued 2,070,000    
Number of Shares Underlying Warrants, Exercised 330,331    
Number of Shares Underlying Warrants, Outstanding 1,751,708    
Warrants Outstanding, Exercise Price   $ 5.50 $ 145.11
Warrants Issued, Exercise Price $ 5.50    
Warrants Exercised, Exercise Price $ 5.50