Segment - Geographic Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 26, 2020	Jun. 28, 2019	Jun. 26, 2020	Jun. 28, 2019
Segment Reporting Information [Line Items]
Net Revenue	[1]	$ 73,994	$ 84,865	$ 152,411	$ 164,971
UNITED STATES
Segment Reporting Information [Line Items]
Net Revenue		35,223	35,710	69,626	65,825
Other countries
Segment Reporting Information [Line Items]
Net Revenue		$ 38,771	$ 49,155	$ 82,785	$ 99,146

[1] Revenue is attributed to countries based on the location of the customer.