10. STOCK-BASED COMPENSATION (Details - Assumptions) - $ / shares |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
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| Employees [Member] | ||
| Volatility | 102.58% | 87.63% |
| Risk-free interest rate | 1.62% | 1.47% |
| Expected term | 3 years 2 months 2 days | 5 years 8 months 4 days |
| Dividend rate | 0.00% | 0.00% |
| Fair value per share on grant date | $ 0.13 | $ 0.27 |
| Non-Employees [Member] | ||
| Volatility | 95.94% | 90.38% |
| Risk-free interest rate | 2.59% | 1.37% |
| Expected term | 10 years | 10 years |
| Dividend rate | 0.00% | 0.00% |
| Fair value per share on grant date | $ 0.33 | $ 0.32 |
| Options Outside the Amended 2013 Plan [Member] | Employees [Member] | ||
| Volatility | 81.10% | |
| Risk-free interest rate | 1.84% | |
| Expected term | 4 years 7 months 17 days | |
| Dividend rate | 0.00% | |
| Fair value per share on grant date | $ 0.15 | |
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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 The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. 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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