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Basic and Diluted Loss Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 03, 2015	Apr. 04, 2014
Numerator:
Net loss	$ (2,340)us-gaap_NetIncomeLoss	$ (1,359)us-gaap_NetIncomeLoss
Weighted average common shares and denominator for basic calculation:
Weighted average common shares outstanding	38,638us-gaap_WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation	38,116us-gaap_WeightedAverageNumberOfSharesCommonStockSubjectToRepurchaseOrCancellation
Less: Unvested restricted stock	157us-gaap_WeightedAverageNumberOfSharesRestrictedStock	322us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Denominator for basic calculation	38,481us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	37,794us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Weighted average effects of potentially dilutive common stock:
Warrants	0us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants	0us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants
Denominator for diluted calculation	38,481us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	37,794us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net loss per share - basic (in dollars per share)	$ (0.06)us-gaap_EarningsPerShareBasic	$ (0.04)us-gaap_EarningsPerShareBasic
Net loss per share - diluted (in dollars per share)	$ (0.06)us-gaap_EarningsPerShareDiluted	$ (0.04)us-gaap_EarningsPerShareDiluted
Employee Stock Option [Member]
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment, Total	0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock [Member]
Weighted average effects of potentially dilutive common stock:
Weighted Average Number Diluted Shares Outstanding Adjustment, Total	0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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