Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 102,296	$ 102,715	$ 200,387	$ 201,338
Asia
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	76,845	77,899	145,856	149,820
Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,585	12,162	24,795	24,304
Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,866	12,654	29,736	27,214
Product revenue - Distributors
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	86,627	88,790	164,099	174,747
Product revenue - Direct
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,469	9,504	25,609	18,656
Licensing and services revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 4,200	$ 4,421	$ 10,679	$ 7,935