Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 718
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STOCK-BASED COMPENSATION - Fair value options (Details)		12 Months Ended
STOCK-BASED COMPENSATION - Fair value options (Details)	Jan. 17, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Award expiration period	10 years
Options [Member]
Dividend yield		0.00%	0.00%	0.00%
Options [Member] \| Minimum
Expected option life		5 years 6 months	5 years 6 months	5 years 5 months 23 days
Risk-free interest rate		0.31%	1.91%	2.64%
Expected stock price volatility		49.20%	63.10%	55.10%
Options [Member] \| Maximum
Expected option life		6 years 3 months	6 years 3 months	6 years 3 months
Risk-free interest rate		1.63%	2.58%	2.93%
Expected stock price volatility		51.20%	66.70%	60.60%
Options [Member] \| Employees and Consultants [Member]
Award expiration period		10 years
Vesting period		4 years
Options [Member] \| Non Employee Director [Member]
Award expiration period		10 years
Options [Member] \| Non Employee Director [Member] \| Minimum
Vesting period		1 year
Options [Member] \| Non Employee Director [Member] \| Maximum
Vesting period		4 years