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STOCK-BASED COMPENSATION - Restricted stock activity (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2018 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
ESPP |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |
Number of shares of common stock made available for purchase to employees | 750,000 |  |  |  |
Maximum percentage of annual salary that an employee is permitted to utilize to purchase stock | 10.00% |  |  |  |
Maximum number of shares that a participant can purchase during any single offering period | 312 |  |  |  |
Maximum fair market value of stock an employee can purchase under the plan per calendar year | $ 25,000 |  |  |  |
Exercise price per share of common stock as a percent of fair market value | 85.00% |  |  |  |
Compensation expense |  | $ 500,000 | $ 600,000 | $ 1,300,000 | $ 900,000
Shares reserved for future issuance |  | 520,414 |  | 520,414 |
RSAs and RSUs |  |  |  |  |
Number of shares |  |  |  |  |
Beginning balance (in shares) |  |  |  | 638,181 |
Granted (in shares) |  |  |  | 223,399 |
Vested (in shares) |  |  |  | (263,071) |
Forfeited (in shares) |  |  |  | (20,307) |
Ending balance of Outstanding and exercisable (in shares) |  | 578,202 |  | 578,202 |
Weighted average grant date fair value |  |  |  |  |
Beginning balance (in USD per share) |  |  |  | $ 125.25 |
Granted (in dollars per share) |  |  |  | 183.04 |
Vested (in USD per share) |  |  |  | 113.90 |
Forfeited (in USD per share) |  |  |  | 144.77 |
Ending balance of Outstanding and exercisable (in USD per share) |  | $ 152.06 |  | $ 152.06 |
PSUs |  |  |  |  |
Number of shares |  |  |  |  |
Beginning balance (in shares) |  |  |  | 134,484 |
Granted (in shares) |  |  |  | 86,996 |
Vested (in shares) |  |  |  | (110,376) |
Ending balance of Outstanding and exercisable (in shares) |  | 111,104 |  | 111,104 |
Weighted average grant date fair value |  |  |  |  |
Beginning balance (in USD per share) |  |  |  | $ 127.72 |
Granted (in dollars per share) |  |  |  | 145.21 |
Vested (in USD per share) |  |  |  | 100.50 |
Ending balance of Outstanding and exercisable (in USD per share) |  | $ 168.45 |  | $ 168.45 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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