Revenue from Contracts with Customers (Contract Liability) (Details) $ in Thousands	6 Months Ended
	Jun. 29, 2019 USD ($)
Movement In Contract With Customer, Liability, Net [Roll Forward]
Beginning balance	$ 1,614
Accruals for estimated future stock rotation and scrap returns	3,347
Less: Release of accruals for recognized stock rotation and scrap returns	(2,461)
Prepayment for products to be manufactured and delivered to the customer within six months	751
Ending balance	3,251
Processing of RMAs	2,800
Net revenue reduction	$ (300)