Geographic Information (Geographical Distribution Of Net Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	$ 27,367	$ 26,893	$ 72,472	$ 85,800
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	18,136	22,483	53,152	71,059
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	1,926	1,248	4,070	4,480
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	3,595	2,780	8,586	9,508
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, net	$ 3,710	$ 382	$ 6,663	$ 753