Financial Statement Components - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	$ (5,202)	$ (2,769)
Current period change	(844)	(2,433)	$ (3,381)
End of period	(6,046)	(5,202)	(2,769)
Foreign Currency Translations [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(4,948)	(2,604)
Current period change	(869)	(2,344)
End of period	(5,817)	(4,948)	(2,604)
Defined Benefit Pension Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(210)	(134)
Current period change	(17)	(76)
End of period	(227)	(210)	(134)
Unrealized Income (Loss) on Investment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(44)	(31)
Current period change	42	(13)
End of period	$ (2)	$ (44)	$ (31)