Consolidated Balance Sheet Details - Property and Equipment, Net by Region (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 9,254	$ 10,618
United States [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	796	796
United Kingdom [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	3,764	4,645
Ireland [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	2,390	2,608
Germany [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	2,249	2,506
Other Countries [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, net	$ 55	$ 63