Intangible assets and goodwill (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Nov. 30, 2015	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost		$ 28,450		$ 28,022
Accumulated amortization		(7,490)		(6,872)
Total		20,960		21,150
Operating Expenses
Finite-Lived Intangible Assets [Line Items]
Amortization expense		618	$ 521
Cost of goods sold
Finite-Lived Intangible Assets [Line Items]
Amortization expense		0	$ 33
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost		11,800		11,800
Accumulated amortization		(2,758)		(2,561)
Total		$ 9,042		$ 9,239
Useful life (in years)		15 years		15 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost		$ 8,300		$ 8,300
Accumulated amortization		(2,425)		(2,252)
Total		$ 5,875		$ 6,048
Useful life (in years)		12 years		12 years
Licenses
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost		$ 63		$ 63
Accumulated amortization		(26)		(25)
Total		$ 37		$ 38
Useful life (in years)		15 years		15 years
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost		$ 6,300		$ 6,300
Accumulated amortization		(1,929)		(1,722)
Total		$ 4,371		$ 4,578
Useful life (in years)		12 years		12 years
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost		$ 1,687		$ 1,259
Accumulated amortization		(89)		(68)
Total		$ 1,598		$ 1,191
Useful life (in years)		5 years		5 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost		$ 300		$ 300
Accumulated amortization		(263)		(244)
Total		$ 37		$ 56
Useful life (in years)		4 years		4 years
Stanford | Patents
Finite-Lived Intangible Assets [Line Items]
Useful life (in years)	15 years
Capitalized non-refundable royalties	$ 63