Stock-Based Compensation (Schedule Of Allocation of Share-Based Compensation Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 589	$ 245
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	171	69
Restricted stock awards and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	418	176
Performance stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	0	0
Cost of revenues
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	15	5
Operating expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 574	$ 240