Segment information - Segment (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)
Number of reportable segments | segment			2
Net revenue	$ 4,776	$ 23	$ 12,773	$ 52
Cost of revenue	1,215	18	3,415	59
Gross profit (loss)	3,561	5	9,358	(7)
Diagnostics
Net revenue	94	$ 23	242	$ 52
Cost of revenue			149
Gross profit (loss)			93
Therapeutics
Net revenue	$ 4,682		12,531
Cost of revenue			3,266
Gross profit (loss)			$ 9,265