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Summary of Warrant Activity (Detail) - $ / shares
 1 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Warrants And Rights Note Disclosure [Abstract]      
Number of Shares Underlying Warrants, Outstanding   1,751,708 12,039
Number of Shares Underlying Warrants, Issued     2,070,000
Number of Shares Underlying Warrants, Exercised   (1,735,419) (330,331)
Number of Shares Underlying Warrants, Outstanding   10,194 1,751,708
Number of Shares Underlying Warrants, Forfeited/Cancelled (4,250) (6,095)  
Warrants Outstanding, Exercise Price     $ 145.11
Warrants Issued, Exercise Price     5.50
Warrants Exercised, Exercise Price   $ 5.50 $ 5.50
Warrants Outstanding, Exercise Price   155.73  
Warrants Forfeited/Cancelled, Exercise Price   $ 5.50