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License and Collaboration Agreements - Additional Information (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
License and Collaboration Agreements [Line Items]            
Research and collaboration revenue     $ 43,000 $ 9,000 $ 683,000 $ 203,000
Lepu Biotech Co., Ltd.            
License and Collaboration Agreements [Line Items]            
One-time upfront payment   $ 4,500,000        
Collaboration agreement transaction price   4,500,000        
Research and collaboration revenue     0   500,000  
Lepu Biotech Co., Ltd. | Maximum            
License and Collaboration Agreements [Line Items]            
Regulatory milestone payments   2,500,000        
Commercial milestone payments   $ 57,500,000        
Research and collaboration revenue       100,000   100,000
Kissei Pharmaceutical Co., Ltd.            
License and Collaboration Agreements [Line Items]            
One-time upfront payment $ 10,000,000          
Research and collaboration revenue     $ 100,000 $ (0) $ 200,000 $ 200,000
Royalties 0          
Kissei Pharmaceutical Co., Ltd. | Maximum            
License and Collaboration Agreements [Line Items]            
Commercial milestone payments 67,000,000          
Development and regulatory milestone payments 33,000,000          
Kissei Pharmaceutical Co., Ltd. | Series D Redeemable Convertible Preferred Stock            
License and Collaboration Agreements [Line Items]            
Purchase of redeemable convertible preferred stock $ 30,000,000