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SHARE-BASED COMPENSATION - Restricted stock units (Details) - Restricted stock units $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Number of units
Nonvested at the beginning | shares	43,000
Vested | shares	9,000
Nonvested at the end | shares	34,000
Weighted average grant date fair value
Nonvested at the beginning (in dollars per share) | $ / shares	$ 13.63
Vested (in dollars per share) | $ / shares	13.63
Nonvested at the end (in dollars per share) | $ / shares	$ 13.63
Unrecognized compensation expense | $	$ 451
Unrecognized compensation expense, recognition period	3 years 10 months 9 days

X

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for 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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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