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Income Taxes - Textual (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Operating Loss Carryforwards [Line Items] |  |  |  |
Change in amount of operating loss carryforwards valuation allowance | $ (2,700) | $ 1,500 |  |
Maximum amount company recognize from unrecognized tax benefit | 8,108 | $ 7,151 | $ 6,477 | $ 6,961
Unrecognized tax benefits that would impact effective tax rate if recognized | 4,600 |  |  |
California [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 23,500 |  |  |
State research and experimental tax credit carryforward | 10,200 |  |  |
Change In valuation allowance for deferred tax assets | 500 |  |  |
Other States [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 1,700 |  |  |
Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Operating loss carryforwards | 18,300 |  |  |
Federal [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
State research and experimental tax credit carryforward | 5,400 |  |  |
Germany[Member] | Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Change In valuation allowance for deferred tax assets | (4,800) |  |  |
Switzerland [Member] | Foreign Tax Authority [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Change In valuation allowance for deferred tax assets | $ 1,600 |  |  |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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