Financial Statement Components - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	$ 262,383	$ 243,774
Ending Balance Value		262,383
Foreign Currency Translations [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	(1,647)	(5,817)
Current period change	(482)	4,170
Ending Balance Value	(2,129)	(1,647)
Defined Benefit Pension Plans [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	(387)	(227)
Current period change	(259)	(160)
Ending Balance Value	(646)	(387)
Unrealized Income (Loss) on Investment [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	(90)	(2)
Current period change	308	(88)
Ending Balance Value	218	(90)
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance Value	(2,124)	(6,046)
Current period change	(433)	3,922
Ending Balance Value	$ (2,557)	$ (2,124)