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STOCK-BASED COMPENSATION - Restricted stock activity (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 31, 2018 | Mar. 31, 2022 | Mar. 31, 2021
Employee Stock Purchase Plan |  |  |
Compensation expense |  | $ 9,100,000 | $ 11,700,000
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 |  |
Compensation expense |  | $ 100,000 | $ 100,000
Shares were reserved for future issuance |  | 637,225 |
ESPP | US. |  |  |
Employee Stock Purchase Plan |  |  |
Exercise price per share of common stock as a percent of fair market value | 90.00% |  |
ESPP | Outside of US |  |  |
Employee Stock Purchase Plan |  |  |
Exercise price per share of common stock as a percent of fair market value | 85.00% |  |
RSAs and RSUs |  |  |
Number of shares |  |  |
Beginning balance (in shares) |  | 443,319 |
Granted (in shares) |  | 253,860 |
Vested (in shares) |  | (176,343) |
Forfeited (in shares) |  | (20,438) |
Ending balance (in shares) |  | 500,398 |
Weighted average grant date fair value |  |  |
Beginning balance (in USD per share) |  | $ 99.22 |
Granted (in dollars per share) |  | 120.77 |
Vested (in USD per share) |  | 98.19 |
Forfeited (in USD per share) |  | 98.98 |
Ending balance (in USD per share) |  | $ 110.52 |
Restricted Stock |  |  |
Number of shares |  |  |
Vested (in shares) |  | (175,047) |
PSUs |  |  |
Number of shares |  |  |
Beginning balance (in shares) |  | 152,410 |
Granted (in shares) |  | 62,388 |
Vested (in shares) |  | (16,834) |
Forfeited (in shares) |  | (33,542) |
Ending balance (in shares) |  | 164,422 |
Weighted average grant date fair value |  |  |
Beginning balance (in USD per share) |  | $ 108.41 |
Granted (in dollars per share) |  | 142.05 |
Vested (in USD per share) |  | 96.00 |
Forfeited (in USD per share) |  | 95.40 |
Ending balance (in USD per share) |  | $ 125.10 |

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- Definition The number of grants made 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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