Segment - Geographic Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018
Segment Reporting Information [Line Items]
Net Revenue	[1]	$ 115,725	$ 100,616	$ 280,696	$ 289,903
UNITED STATES
Segment Reporting Information [Line Items]
Net Revenue	[1]	73,566	44,694	139,391	126,938
Other countries
Segment Reporting Information [Line Items]
Net Revenue	[1]	$ 42,159	$ 55,922	$ 141,305	$ 162,965

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