STOCK-BASED COMPENSATION (Details 1) |
12 Months Ended | |
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Dec. 31, 2017 |
Dec. 31, 2016 |
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| Minimum [Member] | ||
| Risk-free interest rate | 1.75% | 0.85% |
| Expected term of option | 5 years | 6 years |
| Expected stock price volatility | 76.28% | 73.46% |
| Maximum [Member] | ||
| Risk-free interest rate | 2.33% | 2.25% |
| Expected term of option | 7 years 10 months 28 days | 9 years 22 days |
| Expected stock price volatility | 77.59% | 81.59% |
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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 Weighted average expected volatility rate of share-based compensation awards. 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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