Revenue - Revenue from Strategic Partnerships and Other License Agreements (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenues		$ 31,418	$ 29,323
AstraZeneca
Disaggregation of Revenue [Line Items]
Revenues	$ 13,000	18,919	8,308
Seagen
Disaggregation of Revenue [Line Items]
Revenues		768	9,702
Servier
Disaggregation of Revenue [Line Items]
Revenues		4,070	11,313
Boston Pharmaceuticals
Disaggregation of Revenue [Line Items]
Revenues		5,711	0
Genentech
Disaggregation of Revenue [Line Items]
Revenues		$ 1,950	$ 0