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Summary of Warrant (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Shares [Abstract] |  |
Number of warrants, Outstanding | 3,648,541 |
Number Of Warrants Granted | 0 |
Number Of Warrants Exercised | (191,625) |
Class Of Warrant Or Right Cancelled In Period | (11,250) |
Number of warrants, Outstanding | 3,445,666 | 3,648,541
Weighted Average Exercise Price [Abstract] |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 9.75 |
Class Of Warrants Or Right, Exercise Price Of Warrants Grant In Period | 0 |
Class Of Warrants Or Right, Exercise Price Of Warrants Exercised In Period | 7.55 |
Class Of Warrants Or Right, Exercise Price Of Warrants Forfeited In Period | 0 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 9.88 | $ 9.75
Weighted Average Remaining Contractual Term Years [Abstract] |  |
Class Of Warrant Or Rights Grant In Period Weighted Average Remaining Contractual Term | 0 years |
Class Of Warrant Or Rights Exercised Weighted Average Remaining Contractual Term | 0 years |
Class Of Warrant Or Rights Forfeited Weighted Average Remaining Contractual Term | 0 years |
Class Of Warrant Or Rights Outstanding Weighted Average Remaining Contractual Term | 3 years 8 months 8 days | 3 years 8 months 26 days
Aggregate Intrinsic Value [Abstract] |  |
Class Of Warrants Or Right, Outstanding, Aggregate Intrinsic Value | $ 14.25 |
Class Of Warrants Or Right, Grant In Period, Aggregate Intrinsic Value | 0 |
Class Of Warrants Or Right, Exercises In Period, Aggregate Intrinsic Value | 9.96 |
Class Of Warrants Or Right, Forfeitures In Period, Aggregate Intrinsic Value | 0 |
Class Of Warrants Or Right, Outstanding, Aggregate Intrinsic Value | $ 6.07 | $ 14.25

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