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Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2018 | Jun. 30, 2017 | Jun. 29, 2018 | Jun. 30, 2017
Schedule of Employee Service Share-based Compensation [Line Items] |  |  |  |
Share-based Compensation | $ 1,598 | $ 868 | $ 2,899 | $ 1,378
Employee stock options [Member] |  |  |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |  |  |
Share-based Compensation | 897 | 493 | 1,516 | 761
Restricted stock [Member] |  |  |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |  |  |
Share-based Compensation | 59 | 46 | 110 | 86
Restricted stock units [Member] |  |  |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |  |  |
Share-based Compensation | 494 | 329 | 1,092 | 531
Nonemployee stock options [Member] |  |  |  |
Schedule of Employee Service Share-based Compensation [Line Items] |  |  |  |
Share-based Compensation | $ 148 | $ 0 | $ 181 | $ 0

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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