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Summary of Warrant (Detail) - Warrant [Member] - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Shares |  |
Number of warrants, Outstanding | 3,648,541 |
Number of Warrants granted | 0 |
Number of Warrants exercised | (268,663) |
Number of Warrants expired/forfeited | (11,250) |
Number of warrants, Outstanding | 3,368,628 | 3,648,541
Weighted Average Exercise Price |  |
Warrants outstanding Balance | $ 9.75 |
Warrants granted | 0 |
Warrants exercised | 7.82 |
Warrants expired/forfeited | 0 |
Warrants outstanding Balance | $ 9.92 | $ 9.75
Weighted Average Remaining Contractual Term (Years) |  |
Warrants granted | 0 months |
Warrants exercised | 0 months |
Warrants expired/forfeited | 0 months |
Warrants outstanding Balance | 3 years 2 months 16 days | 3 years 8 months 26 days
Aggregate Intrinsic Value |  |
Warrants outstanding Balance | $ 14.25 |
Warrants granted | 0 |
Warrants exercised | 10.58 |
Warrants expired/forfeited | 0 |
Warrants outstanding Balance | $ 12.15 | $ 14.25

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