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Benefit from Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Current: |  |  |
United States—Federal | $ 4 | $ 1,769 | $ 1,033
United States—State | 92 | 196 | 138
Total current | 96 | 1,965 | 1,171
Deferred: |  |  |
United States—Federal | (1,968) | 5,760 | (4,001)
United States—State | (1,325) | (487) | (334)
Ireland and United Kingdom | (5,435) | (16,306) | (143)
Change in valuation allowance | 8,728 | 22,115 | 13,276
Total deferred |  | 11,082 | 8,798
Provision for income taxes | $ 96 | $ 13,047 | $ 9,969

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