Significant Accounting Policies (Schedule of Potentially Dilutive Common Stock Equivalents) (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common stock equivalents	21,279,526	17,395,620
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common stock equivalents	4,678,420	4,768,838
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common stock equivalents	9,055,773	5,081,449
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive common stock equivalents	7,545,333	7,545,333