Annual report [Section 13 and 15(d), not S-K Item 405]

Income Tax - Additional Information (Detail)

v3.25.0.1
Income Tax - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Income Taxes [Line Items]      
Future enacted income tax rate assumed for both Federal and state deferred tax calculations 21.00% 21.00% 21.00%
Deferred tax assets liabilities, valuation allowance $ 81,800,000    
Deferred tax assets 0    
Increase in allowance considered deferred tax assets $ 8,600,000    
Income tax rate assumed for both State and Foreign deferred tax calculations 21.00% 21.00% 21.00%
Tax penalties or accrued interest recorded $ 0 $ 0  
Unrecognized tax benefits 800,000    
Accrued interest and penalties related to income taxes $ 0 0  
Canada [Member]      
Income Taxes [Line Items]      
Tax credit carryforwards expiration year 2025    
Non-capital loss carryforwards $ 107,300,000 107,000,000  
Unclaimed tax deductions related to scientific research and experimental development expenditures 15,800,000    
UK [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards 4,200,000 4,000,000  
Research and Development Tax Credits [Member]      
Income Taxes [Line Items]      
Tax credit carryforwards $ 5,100,000 4,000,000  
Tax credit carryforwards expiration year 2037    
Research and Development Tax Credits [Member] | Canada [Member]      
Income Taxes [Line Items]      
Tax credit carryforwards $ 2,700,000 2,700,000  
Federal [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards $ 116,800,000 $ 90,200,000  
Operating loss carryforwards expiration year 2029    
Operating loss carryforwards indefinitely $ 106,700,000