Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Summary Of Significant Accounting Policies [Abstract]
Accumulated deficit	$ (253,473,000)		$ (236,200,000)
Cash used in operating activities	(15,594,000)	$ (11,687,000)
Cash, cash equivalents, and investments	12,700,000
Net loss	(17,273,000)	$ (18,639,000)
Inventory valuation reserve	$ 0