Revenue from Contracts with Customers (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 103,469	$ 101,484	$ 303,856	$ 302,822
Asia
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	79,644	76,927	225,500	226,747
Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,691	11,873	36,486	36,177
Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	12,134	12,684	41,870	39,898
Product revenue - Distributors
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	84,135	82,969	248,234	257,716
Product revenue - Direct
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	13,342	14,963	38,951	33,619
Licensing and services revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 5,992	$ 3,552	$ 16,671	$ 11,487