Stock compensation plans (Tables)

6 Months Ended

Jun. 30, 2022

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,
	2022		2021		2022		2021
Weighted-average risk-free interest rate	2.9	%	1.0	%	2.5	%	1.0	%
Expected dividend yield	0	%	0	%	0	%	0	%
Expected volatility	50.5	%	50.4	%	50.2	%	50.9	%
Expected term	5.9 years		5.8 years		6.0 years		6.0 years

Schedule of Stock-based compensation expense allocated

	Three months ended				Six months ended
	June 30,				June 30,
	2022		2021		2022		2021
Cost of goods sold	$	60	$	31	$	107	$	47
Selling, general and administrative		1,378		1,090		2,603		1,273
Research and development		283		95		556		150
Total stock-based compensation	$	1,721	$	1,216	$	3,266	$	1,470