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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 01, 2016
Oct. 02, 2015
Jul. 03, 2015
Apr. 03, 2015
Jan. 02, 2015
Oct. 03, 2014
Jul. 04, 2014
Apr. 04, 2014
Jan. 01, 2016
Jan. 02, 2015
Jan. 03, 2014
Interim Period, Costs Not Allocable [Line Items]                      
Net sales $ 20,858 $ 18,750 $ 18,657 $ 18,858 $ 16,573 $ 18,188 $ 20,048 $ 20,178      
Gross profit 14,664 12,799 12,361 12,899 9,403 11,869 13,667 13,884 $ 52,723 $ 48,823 $ 50,309
Net loss $ (842) $ (1,752) $ (1,599) $ (2,340) $ (2,538) $ (2,706) $ (1,789) $ (1,359) $ (6,533) $ (8,392) $ 398
Net loss per share - basic and diluted $ (0.02) $ (0.04) $ (0.04) $ (0.06) $ (0.07) $ (0.07) $ (0.05) $ (0.04) $ (0.17) $ (0.22) $ 0.01