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Stock-Based Compensation - Unearned Stock-based Compensation Expense (Detail) $ in Thousands | Dec. 31, 2018 USD ($)
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Share Based Compensation [Abstract] |
Unearned stock-based compensation expense | $ 3,319

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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