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Significant Accounting Policies (Details 1)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Significant Accounting Policies [Abstract]      
Risk-free interest 1.09% 1.13% 1.26%
Dividend yields 0.00% 0.00% 0.00%
Volatility 85.00% 76.00% 84.00%
Expected option term 3 years 6 months 3 years 9 months 18 days 4 years
Forfeiture rate 0.00% 0.00% 0.00%