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Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jul. 03, 2021 | Jun. 27, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Recognized weighted average period (in years) | 2 years 4 months 24 days |
Contractual term of stock options | 10 years |
Unrecognized compensation cost related to the stock options | $ 400 |
Award of shares granted (in shares) | 101,000 |
Stock-based compensation expense | $ 4,183 | $ 2,447
2012 Nonemployee Director Fees Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Award of shares granted (in shares) | 14,250 | 5,500
Stock-based compensation expense | $ 1,043 | $ 235
Employee Stock Purchase Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Rate of common stock at market value | 85.00% |
Employee Stock Purchase Plan and U.K. Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Number of shares purchased by employees | 14,918 | 23,364
Weighted average price | $ 53.37 | $ 30.94
Share-based compensation expenses | $ 311 | $ 155
Ratio for additional common stock shares issued, under ESPP | 6 |
Time Based [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vesting period | 3 years |
Performance Based [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Vesting period | 3 years |
RSUs [Member] | Minimum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Target amount percentage | 0.00% |
RSUs [Member] | Maximum [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Target amount percentage | 200.00% |
Restricted Stock and Restricted Stock Units [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Compensation expense | $ 2,796 | $ 2,072
Total unrecognized compensation | $ 8,555 |
Recognized weighted average period (in years) | 2 years |

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