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STOCK-BASED COMPENSATION - Restricted stock activity (Details) - USD ($) | 1 Months Ended | 3 Months Ended
--- | --- | ---
May 31, 2018 | Mar. 31, 2021 | Mar. 31, 2020
Employee Stock Purchase Plan |  |  |
Compensation expense |  | $ 11,700,000 | $ 8,300,000
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 |  | 673,775 |
ESPP | US |  |  |
Employee Stock Purchase Plan |  |  |
Exercise price per share of common stock as a percent of fair market value | 90.00% |  |
ESPP | International |  |  |
Employee Stock Purchase Plan |  |  |
Exercise price per share of common stock as a percent of fair market value | 85.00% |  |
Restricted Stock and Restricted Stock Units |  |  |
Number of shares |  |  |
Beginning balance (in shares) |  | 342,082 |
Granted (in shares) |  | 250,829 |
Vested (in shares) |  | (135,853) |
Forfeited (in shares) |  | (556) |
Ending balance (in shares) |  | 456,502 |
Weighted average grant date fair value |  |  |
Beginning balance (in USD per share) |  | $ 108.40 |
Granted (in dollars per share) |  | 87.50 |
Vested (in USD per share) |  | 107.92 |
Forfeited (in USD per share) |  | 98.11 |
Ending balance (in USD per share) |  | $ 97.07 |
Performance-Based Restricted Stock Units |  |  |
Number of shares |  |  |
Beginning balance (in shares) |  | 122,666 |
Granted (in shares) |  | 71,302 |
Vested (in shares) |  | (29,468) |
Forfeited (in shares) |  | (2,318) |
Ending balance (in shares) |  | 162,182 |
Weighted average grant date fair value |  |  |
Beginning balance (in USD per share) |  | $ 115.18 |
Granted (in dollars per share) |  | 98.32 |
Vested (in USD per share) |  | 111.45 |
Forfeited (in USD per share) |  | 116.73 |
Ending balance (in USD per share) |  | $ 108.42 |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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