Geographic Information (Geographical Distribution Of Net Sales) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 21,961	$ 16,628	$ 42,049	$ 34,692
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	17,676	12,223	33,199	23,953
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	2,307	2,520	4,785	5,817
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,891	1,670	3,801	4,538
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 87	$ 215	$ 264	$ 384