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Income Taxes - Summary of the significant components of the company's net deferred tax assets (Detail) - USD ($)
$ in Thousands
Sep. 25, 2021
Sep. 26, 2020
Deferred tax assets:    
Non-capital loss carry-forward $ 11,265 $ 11,794
R&D credits and deductible expenditures 1,993 1,696
Fixed assets 37 0
Other 1 1
Gross deferred tax assets 13,296 13,491
Deferred tax liabilities:    
R&D credits and deductible expenditures (688) (600)
Fixed assets 0 (17)
Gross deferred tax liabilities (688) (617)
Total deferred tax assets and liabilities 12,608 12,874
Valuation allowance (12,608) (12,874)
Net deferred tax assets $ 0 $ 0