v3.25.4
Acquisitions - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Nov. 05, 2025
Oct. 23, 2025
Jun. 02, 2025
Dec. 31, 2025
Oct. 31, 2025
Dec. 31, 2024
May 31, 2021
Business Combinations [Line Items]              
Shares issued in the acquisition of Beckley Psytech, shares       1,546,258      
Common stock, shares, issued       363,280,522   167,959,752  
Restricted Stock Units (RSUs) [Member]              
Business Combinations [Line Items]              
Common stock, shares, issued       93,580,831      
Eleusis Holdings Limited [Member]              
Business Combinations [Line Items]              
Equity Method Investment, Ownership Percentage   100.00%   33.70%      
Beckley Psytech Limited [Member]              
Business Combinations [Line Items]              
Cash consideration, net of cash acquired       $ 5.3      
Common stock, Conversion basis   103,823,190 105,044,902        
Shares issued in the acquisition of Beckley Psytech, shares 6,971,912            
Common stock, shares, issued         900,901    
Gain or loss in connection with Business Combination       6.9      
Transaction Costs       $ 14.3      
Discount Rate       17.80%      
Acquired IPR&D       $ 527.0      
Beckley Psytech Limited [Member] | Restricted Stock Units (RSUs) [Member]              
Business Combinations [Line Items]              
Shares issued in the acquisition of Beckley Psytech, shares 8,695,937            
Common stock, shares, issued       6,971,912      
Beckley Psytech Limited [Member] | Employee Stock [Member]              
Business Combinations [Line Items]              
Shares issued in the acquisition of Beckley Psytech, shares 1,546,258            
Beckley Psytech Limited [Member] | Common Stock [Member]              
Business Combinations [Line Items]              
Shares issued in the acquisition of Beckley Psytech, shares 93,580,831            
Beckley Psytech Limited [Member] | Maximum [Member]              
Business Combinations [Line Items]              
Shares issued in the acquisition of Beckley Psytech, shares 103,823,021            
Beckley Psytech Limited [Member] | Third Party [Member] | Common Stock [Member]              
Business Combinations [Line Items]              
Shares issued in the acquisition of Beckley Psytech, shares 900,901            
IntelGenx [Member]              
Business Combinations [Line Items]              
Estimated fair value of contingent consideration       $ 5.7      
Business Acquisition, Percentage of Voting Interests             25.00%