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Stock-Based Compensation - Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 27, 2015	Jun. 28, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014	Dec. 28, 2014	Nov. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based award vesting period				4 years
Weighted average estimated fair value, options (in dollars per share)			$ 2.10	$ 0.90	$ 2.10
Fair value of unvested stock options, net of unvested forfeitures	$ 2,300		$ 1,900	$ 2,300	$ 1,900
Closing stock price (in dollars per share)	$ 1.65			$ 1.65			$ 2.90
The total intrinsic value of options exercised				$ 83	3,700
Total cash received from employees as a result of employee stock option exercises				117	4,300
Total stock-based compensation	$ 508		$ 452	$ 1,496	$ 1,750
Weighted average estimated fair value (in dollars per share)	$ 3.03			$ 3.03		$ 3.47
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options maximum contractual term				10 years
Total stock-based compensation	$ 218			$ 677
Unrecognized stock-based compensation expense weighted average period				2 years 2 months 1 day
RSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	199			$ 542
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	23			58
Unrecognized compensation expense	1,500			1,500
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 36			$ 36
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
Authorized (in shares)		1,000,000.0
Stock-based compensation expense	$ 68			$ 219
Unrecognized stock-based compensation expense weighted average period				1 month 18 days

X

- 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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Unrecognized cost of unvested share-based compensation awards.

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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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Number of additional shares authorized for issuance under an established share-based compensation plan.

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Price of a single share of a number of saleable stocks of a company.

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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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