Collaborative and Licensing Arrangements - EUSA Pharma (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jan. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Research and Development Arrangement, Contract to Perform for Others
Acquired in-process research and development		$ 83,500	$ 109,500	$ 69,000
EUSA Pharma
Research and Development Arrangement, Contract to Perform for Others
Acquired in-process research and development	$ 40,000
Maximum milestone payments	$ 120