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Summary of Warrant Activity (Detail)
 3 Months Ended
Mar. 31, 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