Income Taxes - Reconciliation Between Income Taxes Computed at the Standard Irish Statutory Tax Rate and the Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Irish Tax Rate	12.50%	12.50%	12.50%
Taxes at the Irish statutory tax rate of 12.5%	$ (792)	$ (5,073)	$ (5,176)
Income tax at rates other than applicable statutory rate	705	(3,169)	4
Change in valuation allowance	2,444	10,365	5,176
Share-based payments	74	164	0
Tax credits	(1,643)	(1,921)	0
Other	23	49	2
Provision for income taxes	$ 811	$ 415	$ 6