Financial Statement Components - Components of Accumulated Other Comprehensive Income (Details) $ in Thousands	6 Months Ended
	Jun. 27, 2015 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	$ (2,769)
Current period change	(1,720)
End of period	(4,489)
Foreign Currency Translations [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(2,604)
Current period change	(1,745)
End of period	(4,349)
Defined Benefit Pension Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(134)
Current period change	0
End of period	(134)
Unrealized Income (Loss) on Investment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(31)
Current period change	25
End of period	$ (6)