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Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 30, 2019 | Mar. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Ratio for additional common stock shares issued, under ESPP | 16.67% |
2012 Nonemployee Director Fees Plan [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Award of shares granted (in shares) | 5,875 | 6,625
Share-based compensation expenses under Director's plan | $ 285 | $ 365
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 | 14,387 | 8,110
Weighted average price | $ 28.37 | $ 45.79
Share-based compensation expenses | $ 255 | $ 63
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 |
Restricted Stock and Restricted Stock Units [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Compensation expense | $ 811 | $ 495
Equity Incentive Plan (2011 Plan) [Member] |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |
Total unrecognized compensation | $ 8,708 |
Recognized weighted average period (in years) | 2 years 1 month 6 days |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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