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Marketable Debt Securities (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2016
Apr. 04, 2015
Jan. 02, 2016
Investments of marketable debt securities [Abstract]      
Marketable debt securities Total Amortized Cost     $ 15,143
Unrealized gains     0
Unrealized losses     (23)
Fair value     15,120
Amortized Cost [Abstract]      
Marketable debt securities - current (due in less than one year)     6,575
Marketable debt securities - non-current (due in one to two years)     8,568
Marketable debt securities Total Amortized Cost     15,143
Fair Value [Abstract]      
Marketable debt securities - current (due in less than one year)     6,567
Marketable debt securities - non-current (due in one to two years)     8,553
Fair value     15,120
Proceeds from marketable debt securities $ 15,100 $ 16,200  
Corporate bonds [Member]      
Investments of marketable debt securities [Abstract]      
Marketable debt securities Total Amortized Cost     7,532
Unrealized gains     0
Unrealized losses     (19)
Fair value     7,513
Amortized Cost [Abstract]      
Marketable debt securities Total Amortized Cost     7,532
Fair Value [Abstract]      
Fair value     7,513
Municipal bonds [Member]      
Investments of marketable debt securities [Abstract]      
Marketable debt securities Total Amortized Cost     5,114
Unrealized gains     0
Unrealized losses     (3)
Fair value     5,111
Amortized Cost [Abstract]      
Marketable debt securities Total Amortized Cost     5,114
Fair Value [Abstract]      
Fair value     5,111
U.S. Agency bonds [Member]      
Investments of marketable debt securities [Abstract]      
Marketable debt securities Total Amortized Cost     2,497
Unrealized gains     0
Unrealized losses     (1)
Fair value     2,496
Amortized Cost [Abstract]      
Marketable debt securities Total Amortized Cost     2,497
Fair Value [Abstract]      
Fair value     $ 2,496