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Supplemental Financial Information (Schedule Of Computation Of Net Loss Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended		12 Months Ended
	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 29, 2018	Dec. 30, 2017
Basic and diluted net loss per share:
Numerator: Net loss	$ (3,108)	$ (3,519)	$ (4,050)	$ (4,644)	$ (3,417)	$ (4,673)	$ (10,677)	$ (12,734)	$ 17,100	$ 13,400
Weighted-average common shares outstanding, basic and diluted	148,058			115,402			142,624	96,516
Basic and diluted net loss per share	$ (0.02)			$ (0.04)			$ (0.07)	$ (0.13)
Weighted average common share equivalents	16,120			15,125			16,212	13,506

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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