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Income taxes (Narrative) (Details) - USD ($) $ in Thousands | Jan. 01, 2022 | Jan. 02, 2021 | Dec. 28, 2019
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Income Tax Disclosure [Line Items] |  |  |
Deferred tax assets, valuation allowance | $ 5,267 | $ 4,284 | $ 6,219
U.S. [Member] | Scientific research investment tax credits [Member] | Federal [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward, amount | 1,600 | 1,500 |
U.S. [Member] | Research and development tax credits [Member] | State [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Tax credit carryforward, amount | 900 | 900 |
U.S. [Member] | Capital loss carryforward [Member] | Federal [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | 64,800 | 37,100 |
U.S. [Member] | Capital loss carryforward [Member] | State [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | 3,300 | 8,700 |
Canada [Member] | Capital loss carryforward [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | 27,800 | 27,900 |
Canada [Member] | Capital loss carryforward [Member] | Foreign tax authority [Member] |  |  |
Income Tax Disclosure [Line Items] |  |  |
Operating loss carryforwards | $ 6,000 | $ 2,800 |

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