Stock Options, Warrants and 401(k) Savings Plan (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense from options not yet recognized
Employer contributions for 401(k) savings plan charged to expense during period
Stock option compensation expense recognized
Number of common shares reserved for possible future warrant issuance and debt conversion	7,884,106
Value of outstanding convertible debentures and accrued interest that could be converted	$ 128,300
Number of common shares reserved for possible future debt conversion	7,192,741
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants expiration date	2021-07