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Summary of Warrant Activity (Detail) | 9 Months Ended
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Sep. 30, 2018 $ / shares shares
Warrants And Rights Note Disclosure [Abstract] |
Number of Shares Underlying Warrants, Outstanding | shares | 1,751,708
Number of Shares Underlying Warrants, Exercised | shares | (1,735,419)
Number of Shares Underlying Warrants, Forfeited | shares | (4,250)
Number of Shares Underlying Warrants, Outstanding | shares | 12,039
Warrants Outstanding, Weighted Average Exercise Price | $ / shares | $ 6.46
Warrants Exercised, Weighted Average Exercise Price | $ / shares | 5.50
Warrants Forfeited, Weighted Average Exercise Price | $ / shares | 5.50
Warrants Outstanding, Weighted Average Exercise Price | $ / shares | $ 145.11

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