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Benefit from Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
Federal-U.S. $ 1,053 $ 660 $ 122
State-U.S. 113 117 118
Total current 1,166 777 240
Deferred:      
Federal-U.S. (3,343) (3,689) (4,065)
State-U.S. (605) (226) 631
Ireland and United Kingdom (9,023) 3,335 (33,106)
Change in valuation allowance 8,719 (3,034) 33,106
Total deferred (4,252) (3,614) (3,434)
Benefit from income taxes $ (3,086) $ (2,837) $ (3,194)