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Stock-Based Compensation (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock compensation expense	$ 807	$ 386	$ 2,185	$ 8,143
Amounts capitalized as part of inventory	107	39	269	227
Total	914	425	2,454	8,370
Cost of Sales [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock compensation expense	2	0	6	560
General and administrative [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock compensation expense	377	248	1,035	3,936
Marketing and selling [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock compensation expense	214	72	558	1,544
Research and development [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock compensation expense	$ 214	$ 66	$ 586	$ 2,103

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- Definition

Reflects the capitalized compensation cost.

+ References

No definition available.

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- Definition

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

+ References

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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

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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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