Segment Information (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment		1
Total long-lived assets		$ 60,525	$ 31,932
United States
Segment Reporting Information [Line Items]
Total long-lived assets		10,393	6,609
Ireland
Segment Reporting Information [Line Items]
Total long-lived assets		50,132	$ 25,323
Property, Plant and Equipment
Segment Reporting Information [Line Items]
Amount of property, plant and equipment and build-out facility	$ 4,200	24,800
Property, Plant and Equipment | Ireland
Segment Reporting Information [Line Items]
Amount of property, plant and equipment and build-out facility		$ 4,200