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Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Numerator:
Net loss	$ (138)	$ 1,173	$ (971)	$ (2,203)	$ (167)	$ (1,778)	$ (2,143)	$ (8,041)	$ (2,139)	$ (12,129)	$ (6,533)
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding									41,025	40,352	39,384
Less: Unvested restricted stock									(21)	(23)	(124)
Denominator for basic calculation									41,004	40,329	39,260
Weighted average effects of potentially dilutive common stock:
Denominator for diluted calculation									41,004	40,329	39,260
Net loss 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)

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Incremental common shares attributable to dilutive effect of nonvested restricted stock.

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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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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of shares of common stock subject to repurchase or cancellation determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period. Common stock subject to repurchase are outstanding common shares that are contingently returnable (that is, subject to recall).

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