Stockholders' Equity And Stock-Based Compensation (Summary Of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total stock-based compensation expense	$ 14,601	$ 10,075	$ 11,287
Cost Of Revenues [Member]
Total stock-based compensation expense	129
Research And Development [Member]
Total stock-based compensation expense	5,211	4,013	3,821
Sales And Marketing [Member]
Total stock-based compensation expense	2,749	1,187	883
General And Administrative [Member]
Total stock-based compensation expense	$ 6,512	$ 4,875	$ 6,583