Summary of Significant Accounting Policies - Schedule of Distribution of Total Operating Expenses by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Operating expenses	$ 4,874	$ 6,335	$ 17,708	$ 27,482
Ireland
Segment Reporting Information [Line Items]
Operating expenses	3,056	4,859	11,166	19,931
U.S.
Segment Reporting Information [Line Items]
Operating expenses	1,817	$ 1,476	6,495	$ 7,551
Bermuda
Segment Reporting Information [Line Items]
Operating expenses	$ 1		$ 47