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Stockholders' Equity - Stock Options Outstanding, Exercisable and Expected to Vest (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Stock options outstanding, exercisable and expected to vest        
Options outstanding, Number of Shares 833,795us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,102,842us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,570,543us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber 1,766,401us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options outstanding, Weighted Average Exercise Price $ 4.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 3.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 3.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice $ 3.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options outstanding, Weighted Average Remaining Contractual Life (years) 4 years 1 month 21 days      
Options exercisable, Aggregate Intrinsic Value $ 3,139us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue      
Options vested and expected to vest, Number of Shares 781,361us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber      
Options vested and expected to vest, Weighted Average Exercise Price $ 4.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice      
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years) 4 years 15 days      
Options exercisable, Aggregate Intrinsic Value 3,026us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue      
Options exercisable, Number of Shares 452,746us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber      
Options vested and expected to vest, Weighted Average Exercise Price $ 3.85us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice      
Exercisable period 3 years 4 days      
Options exercisable, Aggregate Intrinsic Value $ 2,158us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1