Statements Of Cash Flows (Supplemental Disclosures Of Cash Flow Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statements Of Cash Flows [Abstract]
Interest received	$ 1	$ 1	$ 1
Interest paid	716	568	437
Income taxes paid	166	$ 196	$ 263
Noncash Transactions: NXP technology access	2,732
Noncash Transactions: NXP long-term liability	$ 2,600