STOCKHOLDERS' EQUITY - Stock-based Compensation (Details)	12 Months Ended
Dec. 31, 2021 plan shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans \| plan	1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance Shares \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants (in shares)	1,600,000
Expiration period of options granted	10 years
2017 Plan \| Non-employee Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares purchased under restricted stock purchase agreements, minimum (in shares)	70
Shares purchased under restricted stock purchase agreements, maximum (in shares)	54,000
2017 Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future awards (in shares)	703,707
1999 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grants (in shares)	6,000,000

Number of Share Based Compensation Plans

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The maximum number of shares purchased under restricted stock purchase agreements.

+ References

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The minimum number of shares purchased under restricted stock purchase agreements.

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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.

+ References

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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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Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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