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Summary of Warrant Activity (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Warrants And Rights Note Disclosure [Abstract] |  |
Number of Shares Underlying Warrants, Outstanding | 10,194 | 1,751,708
Number of Shares Underlying Warrants, Exercised |  | (1,735,419)
Number of Shares Underlying Warrants, Forfeited/Cancelled | (2,337) | (6,095)
Number of Shares Underlying Warrants, Outstanding | 7,857 | 10,194
Warrants Outstanding, Weighted Average Exercise Price | $ 155.73 | $ 6.46
Warrants Exercised, Weighted Average Exercise Price |  | 5.50
Warrants Forfeited/Cancelled, Weighted Average Exercise Price | 499.50 | 5.50
Warrants Outstanding, Weighted Average Exercise Price | $ 53.61 | $ 155.73

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