Revenue recognition - Grant revenue (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 24, 2022	Sep. 29, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Total revenue			$ 26,646	$ 27,689	$ 79,698	$ 80,269
Research and Development Expense			6,631	6,807	20,290	20,244
Proceeds from RADx grant on assets purchased					520	7,019
RADx
Research and Development Expense			500
RADx WP2
Contract value		$ 18,200			18,200
Research and Development Expense					0	3,400
ADDF
Contract value	$ 2,300				2,300
Proceeds from RADx grant on assets purchased					1,300
Grant revenue
Total revenue			282	1,009	357	4,242
Grant revenue | RADx WP2
Total revenue			0		9,576		$ 9,576
Contract value					18,200		$ 18,200
Grant revenue | ADDF
Total revenue			$ 300		$ 400	$ 400
Research and Development Expense				$ 300