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CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (unaudited) - USD ($)
$ in Thousands
Total
Ordinary Shares
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Accumulated Deficit
Treasury Stock
Treasury Stock, Common, Shares           (5,589,218)
BALANCE at Dec. 31, 2023 $ 1,202,686 $ 1,726 $ 2,736,934 $ (3,110) $ (1,343,528) $ (189,336)
BALANCE (in shares) at Dec. 31, 2023   172,569,051        
Issuance of ordinary shares under employee stock plans 11,226 $ 31 11,195      
Issuance of ordinary shares under employee stock plans (in shares)   3,165,169        
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (28,349)         $ (28,349)
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (in shares)           (960,486)
Share-based compensation 32,863   32,863      
Unrealized gain (loss) on marketable securities, net of tax benefit [provision] (491)     (491)    
Net Income (Loss) 36,828       36,828  
BALANCE at Mar. 31, 2024 1,254,763 $ 1,757 2,780,992 (3,601) (1,306,700) $ (217,685)
BALANCE (in shares) at Mar. 31, 2024   175,734,220        
BALANCE at Dec. 31, 2023 $ 1,202,686 $ 1,726 2,736,934 (3,110) (1,343,528) (189,336)
BALANCE (in shares) at Dec. 31, 2023   172,569,051        
Repurchase of Alkermes' ordinary shares (in shares) (7,900,000)          
Unrealized gain (loss) on marketable securities, net of tax benefit [provision] $ 3,535          
Net Income (Loss) 220,567          
BALANCE at Sep. 30, 2024 1,292,106 $ 1,763 2,831,790 425 (1,122,961) $ (418,911)
BALANCE (in shares) at Sep. 30, 2024   176,258,170        
Treasury Stock, Common, Shares           (6,549,704)
BALANCE at Mar. 31, 2024 1,254,763 $ 1,757 2,780,992 (3,601) (1,306,700) $ (217,685)
BALANCE (in shares) at Mar. 31, 2024   175,734,220        
Issuance of ordinary shares under employee stock plans 2,607 $ 3 2,604      
Issuance of ordinary shares under employee stock plans (in shares)   225,052        
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (651)         $ (651)
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (in shares)           (26,692)
Repurchase of Alkermes' ordinary shares (in shares)           (3,496,187)
Repurchase of Alkermes' ordinary shares (84,689)         $ (84,689)
Share-based compensation 20,606   20,606      
Unrealized gain (loss) on marketable securities, net of tax benefit [provision] 11     11    
Net Income (Loss) 91,358       91,358  
BALANCE at Jun. 30, 2024 1,284,005 $ 1,760 2,804,202 (3,590) (1,215,342) $ (303,025)
BALANCE (in shares) at Jun. 30, 2024   175,959,272        
Treasury Stock, Common, Shares           (10,072,583)
Issuance of ordinary shares under employee stock plans 5,521 $ 3 5,518      
Issuance of ordinary shares under employee stock plans (in shares)   298,898        
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (293)         $ (293)
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (in shares)           (11,152)
Repurchase of Alkermes' ordinary shares (in shares)           (4,398,230)
Repurchase of Alkermes' ordinary shares (115,593)         $ (115,593)
Share-based compensation 22,070   22,070      
Unrealized gain (loss) on marketable securities, net of tax benefit [provision] 4,015     4,015    
Net Income (Loss) 92,381       92,381  
BALANCE at Sep. 30, 2024 $ 1,292,106 $ 1,763 2,831,790 425 (1,122,961) $ (418,911)
BALANCE (in shares) at Sep. 30, 2024   176,258,170        
Treasury Stock, Common, Shares           (14,481,965)
Treasury Stock, Common, Shares 14,493,791         (14,493,791)
BALANCE at Dec. 31, 2024 $ 1,464,977 $ 1,767 2,860,890 (1,967) (976,458) $ (419,255)
BALANCE (in shares) at Dec. 31, 2024   176,670,785        
Issuance of ordinary shares under employee stock plans 29,528 $ 35 29,493      
Issuance of ordinary shares under employee stock plans (in shares)   3,510,611        
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (28,781)         $ (28,781)
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (in shares)           (834,590)
Share-based compensation 22,883   22,883      
Unrealized gain (loss) on marketable securities, net of tax benefit [provision] 512     512    
Net Income (Loss) 22,464       22,464  
BALANCE at Mar. 31, 2025 1,511,583 $ 1,802 2,913,266 (1,455) (953,994) $ (448,036)
BALANCE (in shares) at Mar. 31, 2025   180,181,396        
BALANCE at Dec. 31, 2024 $ 1,464,977 $ 1,767 2,860,890 (1,967) (976,458) (419,255)
BALANCE (in shares) at Dec. 31, 2024   176,670,785        
Repurchase of Alkermes' ordinary shares (in shares) 0          
Unrealized gain (loss) on marketable securities, net of tax benefit [provision] $ 908          
Net Income (Loss) 192,323          
BALANCE at Sep. 30, 2025 1,733,432 $ 1,805 2,966,842 (1,059) (784,135) $ (450,021)
BALANCE (in shares) at Sep. 30, 2025   180,499,470        
Treasury Stock, Common, Shares           (15,328,381)
BALANCE at Mar. 31, 2025 1,511,583 $ 1,802 2,913,266 (1,455) (953,994) $ (448,036)
BALANCE (in shares) at Mar. 31, 2025   180,181,396        
Issuance of ordinary shares under employee stock plans 2,083 $ 3 2,080      
Issuance of ordinary shares under employee stock plans (in shares)   258,354        
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (1,678)         $ (1,678)
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (in shares)           (56,457)
Share-based compensation 25,443   25,443      
Unrealized gain (loss) on marketable securities, net of tax benefit [provision] 55     55    
Net Income (Loss) 87,098       87,098  
BALANCE at Jun. 30, 2025 1,624,584 $ 1,805 2,940,789 (1,400) (866,896) $ (449,714)
BALANCE (in shares) at Jun. 30, 2025   180,439,750        
Treasury Stock, Common, Shares           (15,384,838)
Issuance of ordinary shares under employee stock plans 622   622      
Issuance of ordinary shares under employee stock plans (in shares)   59,720        
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (307)         $ (307)
Receipt of Alkermes' ordinary shares for the exercise of stock options or to satisfy minimum tax withholding obligations related to share-based awards (in shares)           (10,741)
Share-based compensation 25,431   25,431      
Unrealized gain (loss) on marketable securities, net of tax benefit [provision] 341     341    
Net Income (Loss) 82,761       82,761  
BALANCE at Sep. 30, 2025 $ 1,733,432 $ 1,805 $ 2,966,842 $ (1,059) $ (784,135) $ (450,021)
BALANCE (in shares) at Sep. 30, 2025   180,499,470        
Treasury Stock, Common, Shares 15,395,579         (15,395,579)