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Stock-Based Compensation (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 28, 2018	Sep. 29, 2017
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock-based compensation expense	$ 2,027	$ 807	$ 4,926	$ 2,185
Amounts capitalized as part of inventory	182	107	449	269
Total stock-based compensation	2,209	914	5,375	2,454
Cost of Sales [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock-based compensation expense	4	2	11	6
General and administrative [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock-based compensation expense	701	377	1,875	1,035
Marketing and selling [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock-based compensation expense	471	214	1,297	558
Research and development [Member]
Schedule of Employee Service Share-based Compensation [Line Items]
Total stock-based compensation expense	$ 851	$ 214	$ 1,743	$ 586

X

- 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.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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-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

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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
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