Income Taxes - Components of provision for income tax (expense) benefit (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Provision for income tax (expense) benefit
Current	$ 2,717,000	$ 9,000
Deferred	(3,207,000)
Income tax expense	$ (5,924,000)	$ (9,000)
Effective tax rate (as a percent)	12.02%	(0.01%)
Income tax expense		$ 179,000,000.0
Unrecognized tax benefits	$ 79,470,000	75,999,000	$ 75,023,000
Provision for income taxes on undistributed earnings of foreign subsidiaries	0
Undistributed earnings	0
United States
Provision for income tax (expense) benefit
Current	2,881,000
Deferred	$ (3,207,000)
Ireland
Provision for income tax (expense) benefit
Current		$ 8,000
Effective tax rate (as a percent)	(12.02%)	(0.01%)
United Kingdom
Provision for income tax (expense) benefit
Current	$ (164,000)	$ 1,000