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Equity Method Investment (Details) - USD ($)
1 Months Ended 3 Months Ended
Nov. 01, 2019
Feb. 28, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 14, 2020
Schedule of Equity Method Investments [Line Items]            
Purchase of stock in equity method investment     $ 15,938,000 $ 0    
Equity method investment     19,351,000   $ 3,738,000 [1]  
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%          
Purchase of stock in equity method investment   $ 15,900,000        
Equity method investment $ 5,000,000.0          
Notch Therapeutics, Inc. | Voting Interest            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage   20.70%        
Allogene Overland            
Schedule of Equity Method Investments [Line Items]            
Ownership percentage           49.00%
Equity method investment     0   0  
Carrying value     $ 0   $ 0 $ 0
[1] The balance sheet as of December 31, 2020 is derived from the audited financial statements as of that date.