Stock compensation plans - Stock-based compensation expense and unrecognized compensation cost (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Nov. 19, 2024	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 830	$ 73
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation			$ 9,306	$ 10,437
Unrecognized compensation		5,842	$ 5,842
Period for recognition			2 years 1 month 6 days
Employee Stock Option [Member] | Cost of goods sold
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation			$ 215	350
Employee Stock Option [Member] | Selling, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation			7,707	8,621
Employee Stock Option [Member] | Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation			1,384	$ 1,466
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation		$ 9,585	$ 9,585
Period for recognition			2 years 4 months 24 days