Stockholders' Equity (Details 1) |
3 Months Ended | |
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Mar. 31, 2018 |
Mar. 31, 2017 |
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| Expected years until exercise | 3 years 6 months | 3 years 6 months |
| Dividend yield | 0.00% | 0.00% |
| Minimum [Member] | ||
| Expected stock volatility | 78.40% | 70.90% |
| Risk free interest rate | 2.06% | 1.53% |
| Maximum [Member] | ||
| Expected stock volatility | 79.90% | 72.20% |
| Risk free interest rate | 2.45% | 1.79% |
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The estimated measure of the 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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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