Stock compensation plans (Tables)

6 Months Ended

Jun. 30, 2024

Stock compensation plans

Schedule of weighted-average assumptions used to estimate the fair value

	Three months ended		Three months ended		Six months ended		Six months ended
	June 30,		June 30,		June 30,		June 30,
	2024		2023		2024		2023
Weighted-average risk-free interest rate	4.3	%	3.7	%	4.3	%	3.8	%
Expected dividend yield	0	%	0	%	0	%	0	%
Expected volatility	77.0	%	54.3	%	76.1	%	53.5	%
Expected term	5.5 years		5.6 years		5.9 years		5.9 years

Schedule of Stock-based compensation expense allocated

	Three months ended				Six months ended
	June 30,				June 30,
	2024		2023		2024		2023
Cost of goods sold	$	93	$	83	$	167	$	169
Selling, general and administrative		2,201		2,186		4,341		4,108
Research and development		419		351		771		718
Total stock-based compensation	$	2,713	$	2,620	$	5,279	$	4,995