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Summary of Warrant (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Shares [Abstract] |  |  |
Number of warrants, Outstanding | 3,648,541 | 0 |
Warrants assumed in the Merger |  | 1,898,541 |
Warrants granted | 0 | 1,750,000 |
Warrants exercised | (286,357) |  |
Warrants forfeited | (30,189) |  |
Number of warrants, Outstanding | 3,331,995 | 3,648,541 |
Weighted Average Exercise Price [Abstract] |  |  |
Warrants outstanding Balance | $ 9.75 | $ 0 |
Warrants assumed in the Merger |  | 9.06 |
Warrants granted | 0 | 10.49 |
Warrants exercised | 7.84 |  |
Warrants forfeited | 4.50 |  |
Warrants outstanding Balance | $ 9.93 | $ 9.75 |
Weighted Average Remaining Contractual Term Years [Abstract] |  |  |
Warrants assumed in the Merger |  | 2 years 8 months 8 days |
Warrants granted |  | 5 years |
Warrants outstanding Balance | 2 years 11 months 19 days | 3 years 8 months 26 days |
Aggregate Intrinsic Value [Abstract] |  |  |
Warrants outstanding Balance | $ 33.1 | $ 52.0 | $ 0.0
Warrants assumed in the Merger |  | 1.8 |
Warrants granted | 0.0 | $ 0.0 |
Warrants exercised | 3.0 |  |
Warrants forfeited | $ 0.0 |  |

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