Revenue Recognition (Summary Of Revenue Performance Obligations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Performance Obligations
Revenues	$ 25,204	$ 15,996	$ 42,936	$ 32,425
Percent of Revenues	100.00%	100.00%	100.00%	100.00%
Revenue recognized over time [Member]
Performance Obligations
Revenues	$ 695	$ 362	$ 1,098	$ 555
Percent of Revenues	2.80%	2.30%	2.60%	1.70%
Revenue recognized at a point in time [Member]
Performance Obligations
Revenues	$ 24,509	$ 15,634	$ 41,838	$ 31,870
Percent of Revenues	97.20%	97.70%	97.40%	98.30%