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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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