v3.26.1
COLLABORATIONS - Revenue from Collaborators (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues $ 1,290,948 $ 773,689 $ 2,458,123 $ 1,367,878
Regeneron Pharmaceuticals        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues 5,020 32,542 51,356 83,581
Net revenues from collaborations        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues 47,165 61,496 129,240 160,681
Net revenues from collaborations | Roche        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues 41,888 18,267 77,529 35,323
Net revenues from collaborations | Regeneron Pharmaceuticals        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues 5,020 32,542 51,356 83,581
Net revenues from collaborations | Other        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Total revenues $ 257 $ 10,687 $ 355 $ 41,777