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Income taxes (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income taxes [Abstract]
Income tax (benefit) expense	$ 25		$ (148)	$ 116	$ (511)
Effective tax rate	62.50%		21.20%		21.10%
Pre-tax income	$ 40		$ (699)	7	$ (2,417)
Valuation allowance	$ 8,400	$ 8,100		$ 8,400
Discrete income tax charge for valuation allowance		$ 7,300

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