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Accrued Warranty (Details) - USD ($)	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015
Product Warranties Disclosures [Abstract]
Product Warranty Term	12 months
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 518,000	$ 518,000	$ 716,000
Additions	328,000	440,000	598,000
Claims and reversals	(197,000)	(440,000)	(796,000)
Ending Balance	$ 649,000	$ 518,000	$ 518,000

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- Definition

Product Warranty Term

+ References

No definition available.

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- Definition

Standard Product Warranty Accrual, Payments and Reversals

+ References

No definition available.

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- References

No definition available.

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- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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- Definition

Amount of increase in the standard product warranty accrual from warranties issued. Excludes extended product warranties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(3))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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