Summary of Significant Accounting Policies - Schedule of Distribution of Total Operating Expenses by Geographical Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Operating expenses	$ 6,987	$ 8,253	$ 12,834	$ 21,147
Ireland
Segment Reporting Information [Line Items]
Operating expenses	4,192	5,641	8,110	15,072
U.S.
Segment Reporting Information [Line Items]
Operating expenses	2,794	$ 2,612	4,678	$ 6,075
Bermuda
Segment Reporting Information [Line Items]
Operating expenses	$ 1		$ 46