Summary of Significant Accounting Policies - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock Options [Member]
Antidilutive securities excluded from computation of earnings per share, amount	7,983,000	6,852,000	5,194,000
Warrants [Member]
Antidilutive securities excluded from computation of earnings per share, amount	9,395,000	9,395,000	10,109,000
Treasury Shares [Member]
Antidilutive securities excluded from computation of earnings per share, amount	81,000		4,472,000