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Equity Method Investments (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Nov. 01, 2019
Oct. 31, 2021
Feb. 28, 2021
Sep. 30, 2023
Sep. 30, 2023
Dec. 31, 2022
Dec. 14, 2020
Schedule of Equity Method Investments [Line Items]              
Equity method investment       $ 5,365,000 $ 5,365,000 $ 12,817,000  
Notch Therapeutics, Inc.              
Schedule of Equity Method Investments [Line Items]              
Payments to acquire interest in Notch $ 5,100,000            
Transaction cost $ 100,000            
Ownership percentage 25.00%            
Payments for additional investment in interest   $ 1,800,000 $ 15,900,000        
Equity method investment $ 5,000,000            
Equity method investment, impairment       3,000,000 3,000,000 0  
Notch Therapeutics, Inc. | Voting Interest              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage   23.00% 20.70%        
Allogene Overland              
Schedule of Equity Method Investments [Line Items]              
Ownership percentage             49.00%
Equity method investment       0 0 0  
Carrying value       $ 0 $ 0 $ 0 $ 0