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Collaboration Agreement - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2023
Jan. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 28, 2023
Jan. 26, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Proceeds from issuance of private placement       $ 299,706,000 $ 9,958,000    
Contract with customer, performance obligation satisfied in previous period     $ 0        
Unrecognized revenue     50,200,000        
Anito-cel in rrMM              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Clinical milestone achieved     68,300,000        
Anito-cel Next Gen Non-autologous | Maximum              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Potential payments of clinical milestone     530,000,000        
Potential payments of regulatory milestone     935,000,000        
Potential payments of commercial milestone     $ 507,500,000        
Kite Collaboration Agreement              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Non-refundable upfront payment received $ 85,000,000 $ 225,000,000          
Reduction of deemed discount on shares sold             $ 15,300,000
Increase in deemed premium on shares sold           $ 15,600,000  
Kite Collaboration Agreement and Amendment | United States              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Percentage of out-of-pocket development costs for co-promote products     40.00%        
Kite Collaboration Agreement and Amendment | Kite Pharma, Inc. | Outside United States              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Percentage of out-of-pocket development costs for co-promote products     60.00%        
Amended Kite Collaboration Agreement              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Non-refundable upfront payment received $ 85,000,000            
Gilead Common Stock Purchase Agreement              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Shares purchased     3,478,261        
Shares issued, price per share     $ 28.75        
Reduction of deemed discount on shares sold   15,300,000          
Gilead Common Stock Purchase Agreement | Gilead              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Proceeds from issuance of private placement   $ 100,000,000          
Second Gilead Common Stock Purchase Agreement              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Shares purchased 3,242,542   3,242,542 3,242,542      
Shares issued, price per share $ 61.68   $ 61.68 $ 61.68      
Increase in deemed premium on shares sold $ 15,600,000     $ 15,600,000      
Second Gilead Common Stock Purchase Agreement | Gilead              
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]              
Proceeds from issuance of private placement $ 200,000,000