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Collaboration Agreements, License Agreement and Revenues - Transaction Price Related to Consideration Received and Accounts Receivable Allocated to Performance Obligations along with Associated Deferred Revenue (Detail) - Astellas Agreement [Member]
$ in Thousands
Dec. 31, 2022
USD ($)
Japan [Member]  
Revenue Recognition Multiple Deliverable Arrangements [Line Items]  
Cumulative Revenue $ 117,229
Deferred Revenue 0
Total Consideration 117,229
Japan [Member] | License Revenue [Member]  
Revenue Recognition Multiple Deliverable Arrangements [Line Items]  
Cumulative Revenue 100,347
Deferred Revenue 0
Total Consideration 100,347
Japan [Member] | Development Revenue [Member]  
Revenue Recognition Multiple Deliverable Arrangements [Line Items]  
Cumulative Revenue 16,882
Deferred Revenue 0
Total Consideration 16,882
Europe [Member]  
Revenue Recognition Multiple Deliverable Arrangements [Line Items]  
Cumulative Revenue 899,240
Deferred Revenue 0
Total Consideration 899,240
Europe [Member] | License Revenue [Member]  
Revenue Recognition Multiple Deliverable Arrangements [Line Items]  
Cumulative Revenue 618,975
Deferred Revenue 0
Total Consideration 618,975
Europe [Member] | Development Revenue [Member]  
Revenue Recognition Multiple Deliverable Arrangements [Line Items]  
Cumulative Revenue 280,265
Deferred Revenue 0
Total Consideration $ 280,265