Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details 4)

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Stockholders' Equity (Details 4)
12 Months Ended
Dec. 31, 2017
USD ($)
Stockholders Equity Details 4  
Average risk-free interest rate 2.15%
Average expected life- years 5 years 8 months 1 day
Expected volatility 87.24%
Expected dividends $ 0