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Capital Stock - BVF Ownership (Details)
Dec. 31, 2020
Feb. 29, 2020
Series Y Convertible Preferred Stock | BVF    
Sale of stock    
Beneficial ownership limitation (as a percent)   50.00%
BVF | Common Stock | Xoma Corporation    
Sale of stock    
Ownership interest (as a percent) 37.20%  
Ownership interest, if shares are converted (as a percent) 56.60%