Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue
Revenues		$ 2,357	$ 4,651	$ 7,418
Contract assets		0	0
Contract liability		60	433
Revenue, contract liabilities		400
Contracts and grants
Revenue
Revenues		2,301	4,620	5,117
Product development and licensing agreements
Revenue
Revenues		56	31	2,301
Rockefeller | Contracts and grants
Revenue
Revenues		1,800	4,100	4,500
Rockefeller | Product development and licensing agreements
Revenue
Revenues	$ 1,800
National Institute of Health | Contracts and grants
Revenue
Revenues		$ 500	$ 400	$ 400