Revenue Recognition (Summary Of Revenue Performance Obligations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Performance Obligations
Revenues	$ 27,762	$ 20,820	$ 70,698	$ 53,245
Percent of Revenues	100.00%	100.00%	100.00%	100.00%
Revenue recognized over time
Performance Obligations
Revenues	$ 585	$ 546	$ 1,683	$ 1,101
Percent of Revenues	2.10%	2.60%	2.40%	2.10%
Revenue recognized at a point in time
Performance Obligations
Revenues	$ 27,177	$ 20,274	$ 69,015	$ 52,144
Percent of Revenues	97.90%	97.40%	97.60%	97.90%