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STOCK-BASED COMPENSATION - Summary of Share-Based Compensation Activity (Details) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Restricted Stock Units |  |  |  |
Share-Based Awards - Shares |  |  |  |
Unvested at December 31, 2021 (in shares) |  | 281,924 |  |
Granted (in shares) |  | 167,102 |  |
Vested (in shares) |  | (134,626) |  |
Forfeited (in shares) |  | (22,419) |  |
Unvested at June 30, 2022 (in shares) |  | 291,981 | 281,924 |
Share-Based Awards - Weighted Average Grant Date Fair Value |  |  |  |
Unvested at December 31, 2021 (in dollars per share) |  | $ 1,914 |  |
Granted (in dollars per share) |  | 2,103 |  |
Vested (in dollars per share) |  | 1,778 |  |
Forfeited (in dollars per share) |  | 2,056 |  |
Unvested at June 30, 2022 (in dollars per share) |  | $ 2,074 | $ 1,914 |
Performance Share Units |  |  |  |
Share-Based Awards - Shares |  |  |  |
Unvested at December 31, 2021 (in shares) | [1] | 108,323 |  |
Granted (in shares) | [2],[3] | 50,443 |  |
Vested (in shares) |  | (44,276) |  |
Performance share units adjustment (in shares) | [4] | 34,271 |  |
Forfeited (in shares) |  | (1,521) |  |
Unvested at June 30, 2022 (in shares) |  | 147,240 | 108,323 | [1]
Share-Based Awards - Weighted Average Grant Date Fair Value |  |  |  |
Unvested at December 31, 2021 (in dollars per share) | [1] | $ 2,123 |  |
Granted (in dollars per share) | [2],[3] | 2,210 |  |
Vested (in dollars per share) |  | 1,859 |  |
Performance share units adjustment (in dollars per share) | [4] | 2,389 |  |
Forfeited (in dollars per share) |  | 2,413 |  |
Unvested at June 30, 2022 (in dollars per share) |  | $ 2,293 | $ 2,123 | [1]
2021 Grants | Performance Share Units |  |  |  |
Share-Based Awards - Weighted Average Grant Date Fair Value |  |  |  |
Performance share units awarded during the period where a grant date was not yet established. (in shares) |  |  | 12,251 |
Performance share units awarded during the period where a grant date was established. (in shares) |  |  | 7,856 |
Performance Share Units 2022 Grants | Performance Share Units |  |  |  |
Share-Based Awards - Weighted Average Grant Date Fair Value |  |  |  |
Performance share units awarded during the period where a grant date was not yet established. (in shares) |  | 9,692 |  |
[1] | (1) Excludes 12,251 performance share units awarded during the year ended December 31, 2021 for which the grant date under ASC 718, Compensation - Stock Compensation, was not established as of December 31, 2021. Among other conditions, for the grant date to be established, a mutual understanding is required to be reached between the Company and the employee of the key terms and conditions of the award, including the performance targets. The performance targets for each of the annual performance periods under the award are set at the beginning of the respective year.
[2] | (2) Excludes 9,692 performance share units awarded during the six months ended June 30, 2022 for which the grant date under ASC 718 has not been established as of June 30, 2022.
[3] | (3) Includes 7,856 performance share units awarded during the year ended December 31, 2021 for which the grant date under ASC 718 was established.
[4] | (4) Probable outcome for performance-based awards is updated based upon changes in actual and forecasted operating results or expected achievement of performance goals, as applicable, and the impact of modifications.

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