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STOCK-BASED COMPENSATION (Tables) | 9 Months Ended
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Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of Restricted Stock Activity | The following tables summarizes activity for the nine months September 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 |
Granted | 6,319 |  |  | 109.82 |  |  | — |  |  | — |
Vested | (46,823) |  |  | 67.17 |  |  | — |  |  | — |
Forfeited/canceled | (4,761) |  |  | 92.93 |  |  | (853) |  |  | 47.67 |
Unvested shares as of September 30, 2023 | 193,895 |  |  | $ | 83.88 |  |  | 257,971 |  |  | $ | 54.34 |
| 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 |
Granted | — |  |  | — |  |  | — |  |  | — |
Vested | (52,701) |  |  | 66.18 |  |  | — |  |  | — |
Forfeited/canceled | (3,265) |  |  | 85.36 |  |  | — |  |  | — |
Unvested shares as of September 30, 2022 | 201,839 |  |  | $ | 77.60 |  |  | 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 nine months ended September 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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