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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2017	Sep. 29, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 30, 2016	Sep. 30, 2016	Jul. 01, 2016	Apr. 01, 2016	Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Interim Period, Costs Not Allocable [Line Items]
Net sales	$ 24,852	$ 23,473	$ 21,936	$ 20,350	$ 22,137	$ 20,052	$ 20,974	$ 19,269
Gross profit	17,380	16,849	15,474	14,577	15,878	14,872	14,626	12,993	$ 64,280	$ 58,369	$ 52,723
Net (loss) income	$ (138)	$ 1,173	$ (971)	$ (2,203)	$ (167)	$ (1,778)	$ (2,143)	$ (8,041)	$ (2,139)	$ (12,129)	$ (6,533)
Net (loss) income per share - basic and diluted	$ (0.00)	$ 0.03	$ (0.02)	$ (0.05)	$ (0.00)	$ (0.04)	$ (0.05)	$ (0.20)	$ (0.05)	$ (0.30)	$ (0.17)

X

- Definition

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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