Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Current:
Federal	$ 536	$ 508	$ 1,896
State	38	30	13
Foreign	1,869	304	7,918
Current income tax (provision) benefit	2,443	842	9,827
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	(90)	7	90
Deferred income tax (provision) benefit	(90)	7	90
Income tax expense	$ 2,353	$ 849	$ 9,917