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Stock Based Compensation - Summary of Stock Options Outstanding, Vested and Expected to Vest and Exercisable (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended
Oct. 03, 2015
Jan. 03, 2015
Stock options outstanding, exercisable and expected to vest    
Options outstanding, Number of Shares 591,686 833,795
Options vested and expected to vest, Number of Shares 554,357  
Options exercisable, Number of Shares 293,854  
Options outstanding, Weighted Average Exercise Price $ 6.43 $ 4.88
Options vested and expected to vest, Weighted Average Exercise Price 6.31  
Options exercisable, Weighted Average Exercise Price $ 5.14  
Options outstanding, Weighted Average Remaining Contractual Life (years) 4 years 2 months 9 days  
Options vested and expected to vest, Weighted Average Remaining Contractual Life (years) 4 years 1 month 6 days  
Options exercisable, Weighted Average Remaining Contractual Life (years) 3 years 1 month 10 days  
Options outstanding, Aggregate Intrinsic Value $ 1,030  
Options vested and expected to vest, Aggregate Intrinsic Value 1,009  
Options exercisable, Aggregate Intrinsic Value $ 761