Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit	$ (236,200,000)	$ (172,540,000)
Cash used in operating activities	(54,097,000)	(35,365,000)	$ (34,185,000)
Cash, cash equivalents, and investments	28,600,000
Net loss	(63,660,000)	(49,851,000)	(46,971,000)
Inventory valuation reserve	$ 0
Intangible asset useful life	12 years
Long-lived asset impairment	$ 0	0	0
Goodwill impairment	0
Patent costs	600,000	500,000	$ 600,000
Liability for uncertain tax positions	$ 0	$ 0
Maximum [Member] | Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life	5 years
Minimum [Member] | Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Useful life	3 years