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STOCKHOLDERS' EQUITY - Stock Options (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Stock-based compensation
Unrecognized compensation expense stock option	$ 0.8
Stock options
Stock-based compensation
Vesting period	4 years
Percentage of awards vesting on the annual anniversary date of the grant	25.00%
Expiration term	7 years
Weighted average remaining vesting period	1 year 10 months 24 days
2020 Incentive Plan | Stock options
Stock-based compensation
Unrecognized compensation expense stock option		$ 1.5
Weighted average remaining vesting period		2 years 4 months 24 days

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- Definition

Represents the percentage of option awards which vest annually on the anniversary date of the award.

+ References

No definition available.

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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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Amount of cost to be recognized for option under share-based payment arrangement.

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- Definition

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

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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