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Income Taxes - Additional Information (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |
Federal statutory income tax rate | 21.00% | 35.00%
Percentage of disallowance of entertainment expense | 100.00% |

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