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Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Balance of gross unrecognized tax benefits, beginning of period | $ 1,806 | $ 1,407
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in the current period | 1,062 | 199
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in the prior period | 0 | 679
Gross amounts of decrease due to release | (16) | (479)
Balance of gross unrecognized tax benefits, end of period | $ 2,852 | $ 1,806

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=84176650&loc=SL37586934-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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