v3.26.1
Stockholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 07, 2026
Jan. 02, 2026
Dec. 31, 2025
Aug. 13, 2025
Feb. 14, 2025
Feb. 07, 2025
Nov. 25, 2024
Dec. 02, 2022
Mar. 31, 2026
Feb. 28, 2026
Aug. 31, 2025
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jan. 01, 2026
Class Of Stock [Line Items]                                    
Common stock, share reserve for issuance (in shares)                       11,372,310       11,372,310    
Warrant exercise price (in dollars per share)             $ 0.001                      
Number of securities called by warrants (in shares)             917,441                      
Warrants purchase price (in dollars per share)             $ 27.25                      
Proceeds from issuance of warrants             $ 25,000                 $ 99,998 $ 25,000  
Number of warrants exercised (in shares)                       0       0    
Treasury stock value                       $ 53,193     $ 53,193 $ 53,193    
Common stock, par value (in dollars per share)                       $ 0.001     $ 0.001 $ 0.001    
Exercise of stock options (in shares)                               576,859    
Change in ownership interest in consolidated VIE                         $ 0          
Dividends declared by variable interest entity to noncontrolling shareholders                           $ 40,520        
Dividends paid to noncontrolling shareholders                               $ 38,434 0  
Non- controlling Interest                                    
Class Of Stock [Line Items]                                    
Change in ownership interest in consolidated VIE   $ 3,100                     3,133          
Dividends declared by variable interest entity to noncontrolling shareholders                           40,520        
Additional Paid-In Capital                                    
Class Of Stock [Line Items]                                    
Change in ownership interest in consolidated VIE   $ (3,100)                     $ (3,120)          
Visirna Therapeutics, Inc.                                    
Class Of Stock [Line Items]                                    
Ownership interest percentage   56.38%                               66.25%
Variable Interest Entity, Primary Beneficiary                                    
Class Of Stock [Line Items]                                    
Exercise of stock options (in shares)   14,000,000                                
Cash dividends                           $ 100,000        
Dividends declared by variable interest entity to noncontrolling shareholders     $ 40,500                              
Dividends paid                 $ 94,800                  
Dividends paid to noncontrolling shareholders                 38,400                  
Exercise prices paid netted against dividends payable                 3,100                  
Dividends payable                       $ 2,100       $ 2,100    
Pre-Funded Warrants                                    
Class Of Stock [Line Items]                                    
Number of warrants exercised (in shares)                       0       0    
Sarepta | Sarepta Collaboration Agreement                                    
Class Of Stock [Line Items]                                    
Net proceeds from sale of stock           $ 325,000                        
Common stock repurchased (in shares)       2,660,989             2,660,989              
Common stock repurchase price per share (in dollars per share)       $ 18.79                            
Value of stock repurchased       $ 50,000             $ 50,000       $ 50,000      
Milestone payment due from collaborative agreement       100,000                            
Proceeds from collaboration arrangements       50,000 $ 500,000         $ 50,000 50,000       $ 50,000      
Treasury stock value       53,200             53,200              
Gain on settlement of treasury stock       $ 3,200             $ 3,200              
Arrowhead Pharmaceuticals, Inc. | Variable Interest Entity, Primary Beneficiary                                    
Class Of Stock [Line Items]                                    
Dividends paid                 $ 56,400                  
Private Placement                                    
Class Of Stock [Line Items]                                    
Shares of common stock issued (in shares)             11,926,301                      
Common stock sold price (in dollars per share)             $ 27.25                      
Net proceeds from sale of stock             $ 325,000                      
ATM Agreement                                    
Class Of Stock [Line Items]                                    
Shares of common stock issued (in shares)                       367,000       1,056,000    
Net proceeds from sale of stock                       $ 27,200       $ 74,100    
Proceeds from issuance of common stock                       $ 28,000       76,109 241,388  
ATM Agreement | Maximum                                    
Class Of Stock [Line Items]                                    
Common stock shares value reserved for future issuance               $ 500,000                    
Percentage of commission to sales agent               3.00%                    
Underwriting Public Offering                                    
Class Of Stock [Line Items]                                    
Shares of common stock issued (in shares) 2,015,505                                  
Common stock sold price (in dollars per share) $ 64.50                                  
Net proceeds from sale of stock $ 216,600                                  
Proceeds from issuance of common stock                               $ 130,000 $ 0  
Common stock, par value (in dollars per share) $ 0.001                                  
Proceeds from equity offering $ 230,000                                  
Underwriting Public Offering | Pre-Funded Warrants                                    
Class Of Stock [Line Items]                                    
Warrant exercise price (in dollars per share) $ 0.001                                  
Number of securities called by warrants (in shares) 1,550,387                                  
Class of warrant or right, offering price of warrants or rights $ 64.499                                  
2013 and 2021 Incentive Plans and Other Inducement Grants                                    
Class Of Stock [Line Items]                                    
Common stock, share reserve for issuance (in shares)                       20,161,210     9,851,400 20,161,210