Business acquisition - Change in contingent consideration (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition, Contingent Consideration [Line Items]
Income tax benefit		$ (10,405)	$ 46
Abveris
Business Acquisition, Contingent Consideration [Line Items]
Balance at begining	$ 21,338
Change in fair value during the period	(2,052)	(2,100)
Balance at ending	19,286	19,286
Income tax benefit		10,500
Contingent consideration | Abveris
Business Acquisition, Contingent Consideration [Line Items]
Balance at begining	8,500
Change in fair value during the period	(700)
Balance at ending	7,800	7,800
Indemnity holdback | Abveris
Business Acquisition, Contingent Consideration [Line Items]
Balance at begining	12,838
Change in fair value during the period	(1,352)
Balance at ending	$ 11,486	$ 11,486