Summary of Significant Accounting Policies - Schedule of Distribution of Total Operating Expenses by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Operating expenses	$ 23,178	$ 30,999	$ 27,378	$ 20,503	$ 24,183	$ 25,240	$ 15,611	$ 12,394	$ 102,058	$ 77,428	$ 29,963
Ireland
Segment Reporting Information [Line Items]
Operating expenses									90,792	66,552	24,619
U.S.
Segment Reporting Information [Line Items]
Operating expenses									$ 11,266	$ 10,876	$ 5,344