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STOCK-BASED COMPENSATION - Common Stock Options Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Option Shares
Outstanding at beginning of period (shares)	72,300	78,100
Exercised (shares)	0	0
Forfeited or expired (shares)	(600)	(5,800)
Outstanding at end of period (shares)	71,700	72,300
Exercisable at end of period (shares)	57,100	54,100
Fully vested and expected to vest (shares)	71,700	72,300
Weighted Average Exercise Price
Outstanding at beginning of period (USD per share)	$ 11.05	$ 11.18
Exercised (USD per share)	0	0
Forfeited or expired (USD per share)	13.76	11.95
Outstanding at end of period (USD per share)	11.02	11.05
Weighted Average Exercise Price, Exercisable at end of year (USD per share)	10.69	10.82
Weighted Average Exercise Price, Fully vested and expected to vest (USD per share)	$ 11.02	$ 11.05
Weighted Average Remaining Contractual Term, Outstanding at end of period	5 years 2 months 23 days	5 years 5 months 26 days
Weighted Average Remaining Contractual Term, Exercisable at end of period	5 years 21 days	5 years 4 months 13 days
Weighted Average Remaining Contractual Term, Fully vested and expected to vest	5 years 2 months 23 days	5 years 5 months 26 days
Aggregate intrinsic value, exercisable at end of period	$ 98	$ 4
Aggregate intrinsic value, fully vested and expected to vest at end of period	$ 99	$ 0

X

- 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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Weighted average price of options that were either forfeited or expired.

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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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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 exercisable or convertible options. 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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. 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 exercise price, at which grantee can acquire shares reserved for issuance, for 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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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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