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Income taxes - Schedule of Reconciliation of Effective Tax Rate 2025 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
U.S. federal statutory rate	$ (268)
State and local income taxes, net of federal income tax effect	(2,187)
Global intangible low-taxed income	8,735
Other, effect of cross-border tax laws	95
Research and development tax credits	(7,216)
Nondeductible compensation	1,360
Other, nontaxable or nondeductible items	1,169
Foreign exchange and tax rate changes	(1,606)
Changes in unrecognized tax benefits	1,373
Benefit for income taxes	$ (3,030)	$ (51,286)	$ 21,729
Percent
U.S. federal statutory rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax effect	171.50%	(0.50%)	3.60%
Global intangible low-taxed income	(685.10%)	(10.00%)	(112.70%)
Other, effect of cross-border tax laws	(7.50%)
Research and development tax credits	566.00%
Changes in valuation allowances		(0.20%)	(130.00%)
Nondeductible compensation	(106.70%)
Other, nontaxable or nondeductible items	(91.70%)
Foreign tax rates differences		(1.00%)	(9.20%)
Foreign exchange and tax rate changes	126.00%
Changes in unrecognized tax benefits	(107.70%)	19.00%	(134.50%)
Benefit for income taxes	237.60%	66.00%
U.S.
Amount
Changes in valuation allowances	$ (6,454)
Other adjustments	$ 2,160
Percent
Changes in valuation allowances	506.20%
Other adjustments	(169.40%)
U.K.
Amount
Changes in valuation allowances	$ (2,497)
Other adjustments	576
Statutory tax rate difference	$ 2,159
Percent
Changes in valuation allowances	195.80%
Other adjustments	(45.20%)
Foreign tax rates differences	(169.30%)
Other foreign jurisdictions
Amount
Statutory tax rate difference	$ (429)
Percent
Foreign tax rates differences	33.60%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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