Stock Options Valuation Assumptions (Details)	Mar. 31, 2017	Dec. 31, 2016
Stock Options Valuation Assumptions Details
Expected term (in years) Minimum	1.5	1.5
Expected term (in years) Maximum	10	10
Volatility, Minimum	67.30%	67.30%
Volatility, Maximum	139.50%	139.50%
Dividend yield	0.00%	0.00%
Risk-free interest rate, Minimum	0.79%	0.79%
Risk-free interest rate, Maximum	2.32%	2.32%

The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

No definition available.

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