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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 28, 2019 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Right-of-use assets | $ 12,310 | $ 12,310 |  |  |
Lease liabilities | 12,467 | 12,467 |  |  |
Long-lived asset impairment |  | 0 |  |  |
Contract asset, current | 2,796 | 2,796 | $ 2,851 |  |
Contract Liabilities, current | 353 | 353 | 138 |  |
Research and development costs charged to expense |  | 15,163 | $ 14,122 | $ 10,624 |
Restructuring charges | $ 1,724 | $ 1,724 |  | $ 1,031 |
Minimum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Finite-lived intangible assets, estimated useful life |  | 5 years |  |  |
Minimum [Member] | Custom Products [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Contract period for sale of product |  | 3 months |  |  |
Minimum [Member] | Various Services [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Service contracts period |  | 3 months |  |  |
Maximum [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Finite-lived intangible assets, estimated useful life |  | 26 years |  |  |
Maximum [Member] | Custom Products [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Contract period for sale of product |  | 1 year |  |  |
Maximum [Member] | Various Services [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Percentage of revenue |  | 5.00% |  |  |
Service contracts period |  | 1 year |  |  |
ASU 2016-02 |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Right-of-use assets |  |  |  |  | $ 13,900
Lease liabilities |  |  |  |  | 13,900
Cumulative-effect adjustment recognized in retained earnings |  |  |  |  | $ 134

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