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Income Taxes - Benefit from Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current: |  |  |
United States—Federal |  | $ 4 | $ 1,769
United States—State | $ 164 | 92 | 196
Total current | 164 | 96 | 1,965
Deferred: |  |  |
United States—Federal | 1,777 | (1,968) | 5,760
United States—State | (914) | (1,325) | (487)
Ireland and United Kingdom | 1,278 | (5,435) | (16,306)
Change in valuation allowance | (2,141) | 8,728 | 22,115
Total deferred |  |  | 11,082
Provision for income taxes | $ 164 | $ 96 | $ 13,047

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