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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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