Net Loss Per Share (Computation of Basic and Diluted Net Loss Per Share) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Significant Accounting Policies
Net loss basic	$ (22,181,000)	$ (19,479,000)
Change in fair value of derivative liabilities, net of interest		(938,000)
Net loss, diluted	$ (22,181,000)	$ (20,417,000)
Weighted average shares outstanding, basic	16,415,012	7,827,197
Net loss per share, basic	$ (1.35)	$ (2.49)
Weighted average shares outstanding, diluted	16,415,012	8,009,909
Net loss per share, diluted	$ (1.35)	$ (2.55)