Income taxes - Changes in the valuation allowance for deferred tax assets and others (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2026	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income taxes
Net operating loss carryforwards		$ 112,300	$ 76,000	$ 55,200
Valuation allowance at beginning of period		(19,156)	(13,789)	(8,378)
Increases		(13,427)	(5,367)	(5,411)
Valuation allowance at end of period		$ (32,583)	$ (19,156)	$ (13,789)
Statutory corporate tax rate		21.00%	21.00%	35.00%
Tax rate applied on undistributed earnings in the form of cash and cash equivalents		15.50%
Tax rate applied on other earnings		8.00%
Tax payable term (in years)		8 years
Threshold return percentage of GILIT		10.00%
Reduction percentage of inclusion for GILTI		50.00%
Percentage of inclusion for GILTI	37.50%