Revenue recognition - Summarizes the activity under WP2 (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 29, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue recognition
Total revenue		$ 26,646	$ 27,689	$ 79,698	$ 80,269
Grant revenue
Revenue recognition
Total revenue		282	$ 1,009	357	$ 4,242
RADx WP2
Revenue recognition
Total WP2 grant amount	$ 18,200			18,200
RADx WP2 | Grant revenue
Revenue recognition
Total revenue		$ 0		9,576		$ 9,576
Proceeds used for assets				8,624		8,104
Total recognized				18,200		17,680
Total cash received				18,200		17,680
Proceeds received				18,200		17,680
Proceeds reasonably assured						520
Total WP2 grant amount				$ 18,200		$ 18,200