Summary Of Significant Accounting Policies (Loss Per Common Share: Potential Shares Of Common Stock Not Included In The Calculation Of Diluted Net Loss Per Share) (Details) - shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Loss Per Common Share [Abstract]
Non-vested stock bonus plan shares	169,872	57,760
Stock options outstanding	4,190,470	3,315,819
Warrants to purchase common stock	4,000,000	5,489,733

Number of options outstanding, including both vested and non-vested options.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant