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SHARE BASED COMPENSATION - Stock options (Details) - Stock options - $ / shares			3 Months Ended
	Sep. 23, 2021	Aug. 10, 2020	Mar. 31, 2022
SHARE-BASED COMPENSATION
Stock option forfeited (in shares)			28,000
Fair value assumptions for options granted
Expiration period			10 years
Senior management
SHARE-BASED COMPENSATION
Stock options granted (in shares)	55,490	34,626
Exercise price (in dollar per share)	$ 18.02	$ 14.44
Vesting percentage	10.00%	20.00%
Fair value assumptions for options granted
Risk free interest rate	1.41%	0.24%
Dividend yield	0.00%	0.00%
Expected volatility	75.00%	75.00%
Expiration period	10 years	10 years
Expected life	7 years 9 months 18 days	6 years 6 months
Senior management | Departure of senior manager
SHARE-BASED COMPENSATION
Stock option forfeited (in shares)			27,701

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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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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