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STOCK-BASED COMPENSATION - Restricted stock activity (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 31, 2018 | Mar. 31, 2023 | Mar. 31, 2022
Employee Stock Purchase Plan |  |  |
Compensation expense |  | $ 16,900,000 | $ 9,100,000
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 |  | $ 300,000 | $ 100,000
Shares were reserved for future issuance |  | 585,939 |
RSAs and RSUs |  |  |
Number of shares |  |  |
Beginning balance (in shares) |  | 556,062 |
Granted (in shares) |  | 304,433 |
Vested (in shares) |  | (201,977) |
Forfeited (in shares) |  | (3,550) |
Ending balance of Outstanding and exercisable (in shares) |  | 654,968 |
Weighted average grant date fair value |  |  |
Beginning balance (in USD per share) |  | $ 112.07 |
Granted (in dollars per share) |  | 124.89 |
Vested (in USD per share) |  | 108.20 |
Forfeited (in USD per share) |  | 115.89 |
Ending balance of Outstanding and exercisable (in USD per share) |  | $ 119.20 |
PSUs |  |  |
Number of shares |  |  |
Beginning balance (in shares) |  | 166,702 |
Granted (in shares) |  | 84,686 |
Vested (in shares) |  | (55,399) |
Forfeited (in shares) |  | (3,911) |
Ending balance of Outstanding and exercisable (in shares) |  | 192,078 |
Weighted average grant date fair value |  |  |
Beginning balance (in USD per share) |  | $ 125.08 |
Granted (in dollars per share) |  | 142.09 |
Vested (in USD per share) |  | 130.05 |
Forfeited (in USD per share) |  | 154.00 |
Ending balance of Outstanding and exercisable (in USD per share) |  | $ 130.56 |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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