v3.26.3
COLLABORATIONS - Schedule of Revenue from Collaborators (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues $ 1,458,086 $ 1,249,026 $ 3,916,209 $ 2,616,904
Regeneron Pharmaceuticals        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues 32,334 22,542 83,690 106,123
Net revenues from collaborations        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues 71,476 351,742 200,716 512,423
Net revenues from collaborations | Roche        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues 39,107 326,604 116,636 361,927
Net revenues from collaborations | Regeneron Pharmaceuticals        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues 32,334 22,542 83,690 106,123
Net revenues from collaborations | Other        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues $ 35 $ 2,596 $ 390 $ 44,373