Geographic area information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Geographical area information [Abstract]
Net sales	$ 11,123	$ 10,637	$ 9,325	$ 8,301	$ 7,763	$ 7,300	$ 5,285	$ 10,247	$ 39,386	$ 30,595
Fixed assets, net	2,684				1,950				2,684	1,950
United States [Member]
Geographical area information [Abstract]
Net sales									32,400	24,733
International [Member]
Geographical area information [Abstract]
Net sales									$ 6,986	$ 5,862
Sales [Member] | Geographic Concentration Risk [Member] | International [Member]
Geographical area information [Abstract]
Concentration risk percentage									18.00%	19.00%
Sales [Member] | Geographic Concentration Risk [Member] | Europe [Member]
Geographical area information [Abstract]
Concentration risk percentage									53.00%	45.00%
Sales [Member] | Geographic Concentration Risk [Member] | Pacific Rim [Member]
Geographical area information [Abstract]
Concentration risk percentage									35.00%	45.00%
Sales [Member] | Geographic Concentration Risk [Member] | Canada [Member]
Geographical area information [Abstract]
Concentration risk percentage									11.00%	8.00%
Reportable Geographical Components [Member] | United States [Member]
Geographical area information [Abstract]
Net sales									$ 32,400	$ 24,733
Fixed assets, net	1,770				1,079				1,770	1,079
Reportable Geographical Components [Member] | International [Member]
Geographical area information [Abstract]
Net sales									6,986	5,862
Fixed assets, net	$ 914				$ 871				$ 914	$ 871