Geographic Information - Schedule of Long-Lived Assets by Geographic Areas (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 43,275	$ 41,369
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	21,531	23,609
Republic of Ireland
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	9,805	5,019
Other EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	4,147	5,007
EMEA
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	13,952	10,026
APAC
Revenues From External Customers And Long Lived Assets [Line Items]
Long-lived assets	$ 7,792	$ 7,734