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STOCKHOLDERS' EQUITY - Warrants (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Outstanding and Exercisable at ending balance	824
Warrant
Outstanding at beginning balance	100
Number of Warrants, Granted	0
Number of Warrants, Exercised	(10)
Number of Warrants, Forfeited	0
Outstanding and Exercisable at ending balance	90	100
Weighted Average Exercise Price, Outstanding at beginning balance	$ 2.63
Weighted Average Exercise Price, Granted	0
Weighted Average Exercise Price, Exercised	2.50
Weighted Average Exercise Price, Forfeited	0
Weighted Average Exercise Price, Outstanding at ending balance	$ 2.64	$ 2.63
Weighted Average Remaining Contractual Life (Years)	3 years 6 months 7 days	3 years 9 months 3 days
Weighted Average Remaining Contractual Life, Exercised (Years)	3 years 6 months 7 days
Aggregate Intrinsic Value	$ 1,137	$ 1,084
Aggregate Intrinsic Value, Exercised	$ 192

X

- Definition

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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- Definition

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

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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 grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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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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