Segment Information Segment - Market Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Revenue from External Customer [Line Items]
Net Revenue	[1]	$ 94,892	$ 115,725	$ 247,303	$ 280,696
Service Provider [Member]
Revenue from External Customer [Line Items]
Net Revenue		59,083	77,886	145,011	165,536
Broadcast and Media [Member]
Revenue from External Customer [Line Items]
Net Revenue		$ 35,809	$ 37,839	$ 102,292	$ 115,160

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