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Stock-Based Compensation (Details 1) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 30, 2018 | Mar. 31, 2017
Schedule of Employee Service Share-based Compensation [Line Items] |  |
Total stock-based compensation expense | $ 1,301 | $ 510
Amounts capitalized as part of inventory | 122 | 52
Total stock-based compensation | 1,423 | 562
Cost of Sales [Member] |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |
Total stock-based compensation expense | 3 | 2
General and administrative [Member] |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |
Total stock-based compensation expense | 519 | 264
Marketing and selling [Member] |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |
Total stock-based compensation expense | 460 | 116
Research and development [Member] |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |
Total stock-based compensation expense | $ 319 | $ 128

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- Definition Line items represent the schedule of employee service share-based compensation. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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