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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Jan. 02, 2021 | Dec. 28, 2019 | Dec. 29, 2018 | Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Right-of-use assets | $ 16,616 | $ 12,310 |  |
Retained earnings | 270,320 | 267,658 |  |
Long-lived asset impairment | 0 |  |  |
Contract asset, current | 2,776 | 2,796 |  |
Contract Liabilities, current | 4,208 | 353 |  |
Research and development costs charged to expense | $ 15,557 | 15,163 | $ 14,122 |
Restructuring charges |  | 1,724 |  |
Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, estimated useful life | 1 year |  |  |
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 |  |  |
Total Liabilities [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease liabilities | $ 17,464 | $ 12,467 |  |
ASU 2016-02 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Right-of-use assets |  |  |  | $ 13,900
Retained earnings |  |  |  | 134
ASU 2016-02 | Total Liabilities [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease liabilities |  |  |  | $ 13,900

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