Geographical Information - Schedule of Percentage of Long-lived Assets by Geographic Area (Details)	Dec. 31, 2018	Dec. 31, 2017
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of property and equipment, net by geographic area	94.00%	99.00%
Percentage of intangible assets, net by geographic area	82.00%	82.00%
Canada
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of property and equipment, net by geographic area	5.00%
Ireland
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of intangible assets, net by geographic area	18.00%	18.00%
Rest of World
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of property and equipment, net by geographic area	1.00%	1.00%
Percentage of intangible assets, net by geographic area	0.00%	0.00%