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Accrued Expenses - Schedule of Accrued Expenses (Parenthetical) (Detail) | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Payables and Accruals [Abstract] |  |  |
Maximum percentage of current liabilities accrued (in hundredths) | 5.00% | 5.00% | 5.00%

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Period Type: | instant

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- References No definition available. + Details
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