7. STOCKHOLDERS' EQUITY (Details 2)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Dividend yield	0.00%	0.00%
Discount due to lack of marketability	20.00%	20.00%
Minimum
Risk-free interest rate	1.65%	2.15%
Expected volatility of common stock	77.00%	97.00%
Expected life of warrant	2 years 9 months	2 years 9 months
Maximum
Risk-free interest rate	2.46%	2.83%
Expected volatility of common stock	107.00%	119.00%
Expected life of warrant	5 years	5 years

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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.

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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.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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.

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