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Gross Unrecognized Tax Liabilities (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |
Balance at beginning of year | $ 2,007 | $ 1,958
Additions for tax positions related to the current year | 65 | 85
Additions for tax positions related to the prior year | 86 | 86
Deletion for tax positions related to the prior year | (265) | (122)
Balance at end of year | $ 1,893 | $ 2,007

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- Definition Gross amount of unrecognized tax benefits excluding interest and penalties pertaining to uncertain tax positions. + References No definition available. + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 + Details
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