Collaboration and In-License Agreements (Details) - USD ($)			12 Months Ended
	Sep. 04, 2014	Sep. 11, 2006	Dec. 31, 2021	Dec. 31, 2020
License And Collaboration Agreements [Line Items]
Cost of licensing revenue			$ 200,000	$ 0
The University of Texas M. D. Anderson Cancer Center and The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc.
License And Collaboration Agreements [Line Items]
Annual maintenance fee		$ 200,000
Milestone payments		$ 3,800,000
Memorial Sloan Kettering Cancer Center
License And Collaboration Agreements [Line Items]
License agreement expiration term	10 years
Minimum annual royalty payment			$ 100,000	$ 100,000