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STOCK-BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Restricted Stock Activity | The following tables summarizes activity for the six months ended June 30, 2023 and 2022:
| Number of Unvested Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Number of Unvested Performance Vesting Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2023 | 197,772 |  |  | $ | 77.49 |  |  | 190,804 |  |  | $ | 52.15 |
Granted | 43,415 |  |  | 77.84 |  |  | 68,726 |  |  | 56.57 |
Vested | (11,608) |  |  | 70.86 |  |  | — |  |  | — |
Forfeited/canceled | (971) |  |  | 87.68 |  |  | (5,069) |  |  | 47.67 |
Unvested shares as of March 31, 2023 | 228,608 |  |  | $ | 77.85 |  |  | 254,461 |  |  | $ | 53.43 |
Granted | 55,041 |  |  | 94.53 |  |  | 15,094 |  |  | 66.66 |
Vested | (43,088) |  |  | 86.28 |  |  | — |  |  | — |
Forfeited/canceled | (1,401) |  |  | 89.08 |  |  | (10,731) |  |  | 50.69 |
Unvested shares as of June 30, 2023 | 239,160 |  |  | $ | 80.10 |  |  | 258,824 |  |  | $ | 54.32 |
| Number of Unvested Restricted Stock Units |  | Weighted Average Grant Date Fair Value |  | Number of Unvested Performance Vesting Restricted Stock Units |  | Weighted Average Grant Date Fair Value
Unvested shares as of January 1, 2022 | 198,413 |  |  | $ | 66.04 |  |  | 153,138 |  |  | $ | 48.54 |
Granted | 2,154 |  |  | 73.83 |  |  | — |  |  | — |
Vested | (3,074) |  |  | 65.75 |  |  | — |  |  | — |
Forfeited/canceled | (1,157) |  |  | 66.89 |  |  | — |  |  | — |
Unvested shares as of March 31, 2022 | 196,336 |  |  | $ | 67.16 |  |  | 153,138 |  |  | $ | 48.54 |
Granted | 76,038 |  |  | 97.55 |  |  | 37,666 |  |  | 66.82 |
Vested | (10,817) |  |  | 63.53 |  |  | — |  |  | — |
Forfeited/canceled | (3,752) |  |  | 75.70 |  |  | — |  |  | — |
Unvested shares as of June 30, 2022 | 257,805 |  |  | $ | 75.37 |  |  | 190,804 |  |  | $ | 52.15 |
Schedule of Grant Date Fair Value of Awards Granted | The table below summarizes the assumptions used in the Monte Carlo simulation to determine the grant date fair value of awards granted during the six months ended June 30, 2023:
Grant date | January 24, 2023 | March 3, 2023 | April 3, 2023
Forecast period (years) | 3 | 3 | 3
Risk-free interest rates | 3.88% | 4.64% | 3.79%
Implied equity volatility | 87.2% | 86.4% | 70.8%
Stock price on the date of grant | $72.99 | $82.20 | $79.50

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- Definition Tabular disclosure of share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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