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STOCKHOLDERS' EQUITY - Stock Options Exercisable (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares shares
18.91
Share-based compensation
Range of grant prices per share (in dollars per share)	$ 18.91
Outstanding
Number | shares	159,384
Weighted Average Exercise Price Per Share (in dollars per share)	$ 18.91
Weighted Average Remaining Contractual Life	6 years 2 months 12 days
28.23
Share-based compensation
Range of grant prices per share (in dollars per share)	$ 28.23
Outstanding
Number | shares	159,384
Weighted Average Exercise Price Per Share (in dollars per share)	$ 28.23
Weighted Average Remaining Contractual Life	6 years 2 months 12 days
37.83
Share-based compensation
Range of grant prices per share (in dollars per share)	$ 37.83
Outstanding
Number | shares	159,384
Weighted Average Exercise Price Per Share (in dollars per share)	$ 37.83
Weighted Average Remaining Contractual Life	6 years 2 months 12 days

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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