SHARE-BASED COMPENSATION (Details 3)	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Expected volatility	50.00%	50.00%	50.00%	50.00%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	0.90%	0.90%	0.90%	0.90%
Expected term in years	8 months 26 days	7 months 6 days	8 months 26 days	7 months 6 days
Stock Option [Member]
Expected volatility	50.00%	50.00%	50.00%	50.00%
Dividend yield	0.00%	0.00%	0.00%	0.00%
Risk-free interest rate	1.10%	2.20%	0.90%	2.20%
Expected term in years	4 years 3 months	4 years 1 month 13 days	4 years 3 months	4 years 1 month 20 days

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.

+ References

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- Definition

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

+ References

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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