Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 7)

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Stockholders' Equity (Details 7)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dividend yield 0.00% 0.00% 0.00%
Minimum [Member]      
Expected stock volatility 70.50% 71.00%  
Risk free interest rate 1.38% 0.92% 1.32%
Expected years until exercise 2 years 6 months 2 years 6 months 3 years 4 months 24 days
Maximum [Member]      
Expected stock volatility 73.20% 80.00%  
Risk free interest rate 2.03% 1.77% 1.75%
Expected years until exercise 3 years 6 months 4 years 3 years 6 months