Segment - Geographic Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Segment Reporting Information [Line Items]
Net Revenue	[1]	$ 94,892	$ 115,725	$ 247,303	$ 280,696
UNITED STATES
Segment Reporting Information [Line Items]
Net Revenue		44,933	73,566	114,559	139,391
Other countries
Segment Reporting Information [Line Items]
Net Revenue		$ 49,959	$ 42,159	$ 132,744	$ 141,305

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