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STOCK-BASED COMPENSATION PLANS - Summary of stock option activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Summary of stock option activity under the option Plan
Outstanding at ending balance	764
Exercisable Number of Options	703
Employee Stock Option [Member]
Summary of stock option activity under the option Plan
Outstanding at beginning balance	765
Number of Shares, Exercised	(1)
Outstanding at ending balance	764	765
Exercisable Number of Options	703
Weighted Average Exercise Price, Outstanding at beginning balance	$ 1.36
Weighted Average Exercise Price, Exercised	2.94
Weighted Average Exercise Price, Outstanding at ending balance	1.36	$ 1.36
Weighted Average Exercise Price, Exercisable at ending balance	$ 1.11
Weighted Average Remaining Contractual Life, Outstanding	4 years 5 months 4 days	4 years 8 months 4 days
Weighted Average Remaining Contractual Life, Exercisable (Years)	4 years 2 months 15 days
Aggregate Intrinsic Value, Outstanding	$ 3,780	$ 5,896
Aggregate Intrinsic Value, Exercisable	$ 3,627

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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