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Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014	Dec. 28, 2014	Nov. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity award vesting period			4 years
Weighted average estimated fair value, options (in dollars per share)		$ 1.86	$ 0.90	$ 2.10
Fair value of unvested stock options	$ 2,700	$ 2,100	$ 2,700	$ 2,100
Weighted average recognition period of unrecognized stock-based compensation expense			4 months 15 days
Closing stock price (in dollars per share)	$ 1.61		$ 1.61			$ 2.90
Total cash received from employees as a result of employee stock option exercises			$ 114	4,200
The total intrinsic value of options exercised			81	3,600
Stock-based compensation	$ 491	$ 566	$ 988	$ 1,298
Weighted average estimated fair value (in dollars per share)	$ 3.10		$ 3.10		$ 3.47
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period			10 years
Weighted average recognition period of unrecognized stock-based compensation expense			2 years 3 months 4 days
Stock-based compensation	$ 211		$ 459
Restricted stock award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	188		343
Performance restricted stock unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	20		35
Unrecognized stock-based compensation expense	1,700		$ 1,700
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average recognition period of unrecognized stock-based compensation expense			1 month 15 days
Unrecognized stock-based compensation expense	$ 121		$ 121
Weighted average estimated fair value (in dollars per share)	$ 0.48	$ 1.01	$ 0.48	$ 1.01
Shares available for issuance (in shares)	1,634,000		1,634,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	1,000,000.0
Compensation expense related to ESPP	$ 72		$ 151

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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.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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