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Stockholders' Equity (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Schedule of Employee Service Share-based Compensation [Line Items]
Stock-based compensation expense	$ 3,161	$ 8,558	$ 3,304
Employee Stock Option [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Stock-based compensation expense	1,731	5,485	2,306
Restricted Stock [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Stock-based compensation expense	186	298	485
Restricted Stock Units (RSUs) [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Stock-based compensation expense	1,226	2,717	452
Consultant Compensation [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Stock-based compensation expense	$ 18	$ 58	$ 61

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- Definition

Line items represent the schedule of employee service share-based compensation.

+ References

No definition available.

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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

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