v3.26.1
Income Taxes - Additional Information (Detail) - USD ($)
 8 Months Ended 12 Months Ended
Dec. 31, 2025
Apr. 30, 2025
Apr. 30, 2024
Nov. 21, 2016
Operating Loss Carryforwards [Line Items]        
Income tax expense (benefit) $ (1,033,000) $ 3,392,000 $ 0  
Change in valuation allowance $ 46,100,000 $ 6,500,000 $ 13,300,000  
U.S. federal statutory rate 21.00% 21.00% 21.00%  
Deferred tax assets resulting from capitalized research expenses $ 1,700,000      
Annual 382 Limitation [Member]        
Operating Loss Carryforwards [Line Items]        
NOL carryforwards 111,000,000      
Net operating loss carryforwards to offset future taxable income 1,500,000      
R&D Credit Carryforward [Member] | Subject to 383 Limitation [Member]        
Operating Loss Carryforwards [Line Items]        
Tax credit carry forward amount 1,500,000      
Credit to expire unutilized 1,500,000      
U.S. Federal Income Tax [Member]        
Operating Loss Carryforwards [Line Items]        
NOL carryforwards 6,100,000     $ 3,700,000
U.S. Federal Income Tax [Member] | Annual 382 Limitation [Member]        
Operating Loss Carryforwards [Line Items]        
NOL carryforwards 300,000      
Net operating loss unutilized 76,700,000      
U.S. Federal Income Tax [Member] | Annual Limitation [Member]        
Operating Loss Carryforwards [Line Items]        
NOL carryforwards 1,500,000     $ 2,400,000
U.S. Federal Income Tax [Member] | Carried Forward Indefinitely [Member]        
Operating Loss Carryforwards [Line Items]        
NOL carryforwards 90,900,000      
U.S. Federal Income Tax [Member] | Carried Forward Indefinitely [Member] | Subject To 382 Limitation [Member]        
Operating Loss Carryforwards [Line Items]        
NOL carryforwards $ 23,000,000      
U.S. Federal Income Tax [Member] | Earliest Tax Year [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carry forwards expiration period 2036      
State Income Tax [Member]        
Operating Loss Carryforwards [Line Items]        
NOL carryforwards $ 166,300,000      
State Income Tax [Member] | Earliest Tax Year [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carry forwards expiration period 2036      
Foreign Tax Jurisdiction [Member] | United Kingdom [Member]        
Operating Loss Carryforwards [Line Items]        
Income tax expense (benefit) $ (1,000,000) $ 3,400,000    
NOL carryforwards 216,700,000      
Foreign Tax Jurisdiction [Member] | Maximum [Member] | Japan [Member]        
Operating Loss Carryforwards [Line Items]        
NOL carryforwards $ 3,800,000      
Foreign Tax Jurisdiction [Member] | Earliest Tax Year [Member] | Japan [Member]        
Operating Loss Carryforwards [Line Items]        
Operating loss carry forwards expiration period 2034