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Income Taxes - Expiry Dates of Federal and State Income Tax Credit Carryforwards (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
U.S. federal |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | $ 56,285
U.S. federal | U.S. Foreign Tax Credit |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | $ 46,639
U.S. federal | U.S. Foreign Tax Credit | Minimum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, expiration year | 2021
U.S. federal | U.S. Foreign Tax Credit | Maximum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, expiration year | 2026
U.S. federal | U.S. research tax credit |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | $ 9,623
U.S. federal | U.S. research tax credit | Minimum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, expiration year | 2031
U.S. federal | U.S. research tax credit | Maximum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, expiration year | 2036
U.S. federal | U.S. business tax credits |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | $ 23
U.S. federal | U.S. business tax credits | Minimum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, expiration year | 2031
U.S. federal | U.S. business tax credits | Maximum |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards, expiration year | 2036
California (U.S.) |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | $ 15,499
California (U.S.) | State investment tax credits |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | 858
California (U.S.) | State research tax credits |
Tax Credit Carryforward [Line Items] |
Tax credit carryforwards | $ 14,641

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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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