Intangible assets and goodwill (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost	$ 27,422	$ 27,422
Accumulated amortization	(5,262)	(4,708)
Total	22,160	22,714
Amortization expense	554	520
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost	11,800	11,800
Accumulated amortization	(1,971)	(1,774)
Total	$ 9,829	$ 10,026
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	(1,733)	(1,560)
Total	$ 6,567	$ 6,740
Useful life (in years)	12 years	12 years
Licenses
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost	$ 63	$ 63
Accumulated amortization	(22)	(20)
Total	$ 41	$ 43
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	(1,315)	(1,184)
Total	$ 4,985	$ 5,116
Useful life (in years)	12 years	12 years
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost	$ 659	$ 659
Accumulated amortization	(33)
Total	$ 626	$ 659
Useful life (in years)	5 years	5 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Intangible assets, cost	$ 300	$ 300
Accumulated amortization	(188)	(170)
Total	$ 112	$ 130
Useful life (in years)	4 years	4 years