Income taxes - Change in Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Beginning balance	$ 33,402	$ 2,993	$ 8,498
Deferred tax liabilities assumed through acquisitions	0	0	(8,498)
Charged to income tax expense	16,115	30,409	2,993
Ending balance	$ 49,517	$ 33,402	$ 2,993