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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Taxes [Line Items]    
Provision for income taxes $ 181 $ 266
Revenue Commissioners, Ireland [Member]    
Income Taxes [Line Items]    
Effective Income Tax Rate, Ireland Statutory, percent 12.50% 12.50%