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Income taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Tax Credit Carryforward, Expiration Date | Jan. 01, 2029 |  |
Valuation Allowance, Amount | $ 5,445 | $ 9,162 | $ 9,090
US | State and Local Jurisdiction [Member] |  |  |
Operating Loss Carryforwards | 15,100 | 62,600 |
Research Tax Credit Carryforward [Member] | US |  |  |
Tax Credit Carryforward, Amount | 1,100 | 400 |
Research Tax Credit Carryforward [Member] | US State [Member] |  |  |
Tax Credit Carryforward, Amount | 900 | 900 |
Capital Loss Carryforward [Member] | US |  |  |
Operating Loss Carryforwards | 72,000 | 46,000 |
Capital Loss Carryforward [Member] | CA |  |  |
Operating Loss Carryforwards | $ 29,700 | $ 27,700 |

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