Geographic Information (Geographical Distribution Of Net Sales) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 24,034	$ 15,570	$ 66,083	$ 50,262
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	19,605	11,201	52,804	35,154
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	2,317	2,706	7,102	8,523
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,740	1,380	5,541	5,918
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 372	$ 283	$ 636	$ 667