Income Taxes - (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 148	$ 95	$ 477	$ 250
Effective tax rate	(3.60%)	(1.90%)	(4.50%)	(1.70%)