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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 |

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