Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Revenue
Revenue, contract liabilities	$ 100		$ 200
Revenues	163	$ 3,480	337	$ 4,165
Contract assets	0		0		$ 0
Contract liability	463		463		$ 433
Product development and licensing agreements
Revenue
Revenues	0	26	30	29
Contracts and grants
Revenue
Revenues	163	3,454	307	4,136
Rockefeller University And Gilead Sciences | Contracts and grants
Revenue
Revenues	$ 100	$ 3,200	$ 200	$ 3,800