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Income taxes
 12 Months Ended
Dec. 31, 2025
Income Taxes [Abstract]  
Income taxes Income taxes:
(a)Current tax expense:
The components of income tax benefit (expense) included in the determination of the profit (loss) from continuing operations comprise of:
20252024
Current tax expense
Current period income tax$51 $121 
Withholding tax— — 
Total current tax expense$51 $121 
Deferred tax expense
Origination and reversal of temporary differences$(39,953)$(14,279)
Adjustments for prior periods5,811 1,648 
Change in unrecognized deductible temporary differences34,142 12,631 
Total deferred tax expense$— $— 
Total income tax expense from continuing operations$51 $121 
The Corporation’s effective income tax rate differs from the combined Canadian federal and provincial statutory income tax rate for companies. The principal factors causing the difference are as follows:
20252024
Net loss before income taxes (from continuing operations)$(90,863)$(323,409)
Expected tax recovery at 27.00% (2024 – 27.00%)$(24,533)$(87,320)
Increase (reduction) in income taxes resulting from:
Non-deductible expenses (non-taxable income)83 53,847 
Expiry of losses and ITC1,598 310 
Investment tax credits earned(3,407)(4,703)
Foreign tax rate and tax rate differences1,519 3,415 
Change in unrecognized deductible temporary differences24,770 34,514 
Other21 58 
Income taxes from continuing operations$51 $121 
(b)    Unrecognized deferred tax asset:
At December 31, 2025, the Corporation did not recognize any deferred tax assets resulting from the following deductible temporary differences for financial statement and income tax purposes.
28.     Income taxes (cont'd):
(b)    Unrecognized deferred tax asset (cont'd):
20252024
Scientific research expenditures$166,556 $148,077 
Investments44,931 43,891 
Share issuance costs86 4,633 
Losses from operations carried forward563,850 440,572 
Capital losses carried forward40,460 4,843 
Investment tax credits53,510 48,277 
Property, plant and equipment and intangible assets255,266 226,425 
$1,124,659 $916,718 
Deferred tax assets have not been recognized in respect of these deductible temporary differences because it is not currently probable that future taxable profit will be available against which the Corporation can utilize the benefits.
The Corporation has available to carry forward the following as at December 31:
20252024
Canadian scientific research expenditures$166,556 $148,077 
Canadian losses from operations390,148 288,258 
Canadian capital losses from operations42,942 9,827 
Canadian investment tax credits53,510 48,277 
US federal losses from operations41,027 42,949 
Denmark losses from operations114,108 81,130 
Hong Kong losses from operations227 128 
UK losses from operations— 20,440 
UK research and development tax credits— 120 
The Canadian scientific research expenditures may be carried forward indefinitely. The Canadian losses from operations may be used to offset future Canadian taxable income and expire over the period from 2035 to 2045.
The Hong Kong and Denmark losses from operations may be used to offset future taxable income in Hong Kong and Denmark for corporate tax and trade tax purposes and may be carried forward indefinitely.
The US federal losses from operations incurred prior to January 1, 2018 may be used to offset future US taxable income and expire over the period from 2025 to 2038 and may be carried forward indefinitely for losses incurred after January 1, 2018.
The Canadian investment tax credits may be used to offset future Canadian income taxes otherwise payable and expire over the period from 2025 to 2045.