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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 |  |

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