Selected Balance Sheet Data (Geographical Distribution Of Long-Lived Assets, Net) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Consolidated	$ 14,161	$ 14,177
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Consolidated	12,537	12,539
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Consolidated	1,454	1,460
Other Geographical [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Consolidated	$ 170	$ 178