Annual report pursuant to Section 13 and 15(d)

Income Tax - Additional Information (Detail)

v3.22.0.1
Income Tax - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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 $ 55,500,000    
Deferred tax assets 0    
Increase in allowance considered deferred tax assets $ 7,500,000    
Income tax rate assumed for both State and Foreign deferred tax calculations 21.00% 21.00% 21.00%
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 2041    
Non-capital loss carryforwards $ 109,500 105,600  
Unclaimed tax deductions related to scientific research and experimental development expenditures 16,000    
UK [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards 3,500 3,200  
Research and Development Tax Credits [Member]      
Income Taxes [Line Items]      
Tax credit carryforwards $ 400,000 300,000  
Tax credit carryforwards expiration year 2041    
Research and Development Tax Credits [Member] | Canada [Member]      
Income Taxes [Line Items]      
Tax credit carryforwards $ 2,700 2,800  
Federal [Member]      
Income Taxes [Line Items]      
Operating loss carryforwards $ 47,400,000 $ 34,800,000  
Operating loss carryforwards expiration year 2021    
Operating loss carryforwards indefinitely $ 37,300,000