Net Loss per Common Share (Basic and Diluted Income (Loss) Per Share) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic and diluted net loss per common share calculation:
Net loss, basic	$ (1,606,000)	$ (779,000)	$ (7,790,000)	$ (10,486,000)
Net loss, diluted	$ (1,627,000)	$ (779,000)	$ (7,790,000)	$ (12,032,000)
Weighted average shares outstanding, basic	16,468,308	8,874,813	15,418,146	5,326,139
Net loss per share, basic	$ (0.10)	$ (0.09)	$ (0.51)	$ (1.97)
Weighted average shares outstanding, diluted	16,496,957	8,874,813	15,418,146	5,518,847
Net loss per share, diluted	$ (0.10)	$ (0.09)	$ (0.51)	$ (2.18)
November 2016 Warrants [Member]
Basic and diluted net loss per common share calculation:
Changes in estimated fair value of warrants	$ (21,000)			$ (1,546,000)