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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Cash and Cash Equivalents [Line Items] |  |
Percentage of fixed interest rate | 6.89% | 13.64%
Bank certificates of deposit [member] | Bottom of range [member] |  |
Cash and Cash Equivalents [Line Items] |  |
Percentage of accrued interest on certificate of deposits | 50.00% | 75.00%
Bank certificates of deposit [member] | Top of range [member] |  |
Cash and Cash Equivalents [Line Items] |  |
Percentage of accrued interest on certificate of deposits | 106.00% | 106.00%

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- Details
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- Details
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- Details
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