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v3.21.2

STOCK-BASED COMPENSATION - Restricted stock activity (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2018 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Employee Stock Purchase Plan |  |  |  |  |
Compensation expense |  | $ 5,500,000 | $ 4,600,000 | $ 17,200,000 | $ 12,900,000
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 | $ 200,000 | $ 200,000
Shares were reserved for future issuance |  | 673,775 |  | 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) |  |  |  | 282,966 |
Vested (in shares) |  |  |  | (156,273) |
Forfeited (in shares) |  |  |  | (5,496) |
Ending balance (in shares) |  | 463,279 |  | 463,279 |
Weighted average grant date fair value |  |  |  |  |
Beginning balance (in USD per share) |  |  |  | $ 108.40 |
Granted (in dollars per share) |  |  |  | 90.42 |
Vested (in USD per share) |  |  |  | 106.84 |
Forfeited (in USD per share) |  |  |  | 95.72 |
Ending balance (in USD per share) |  | $ 98.09 |  | $ 98.09 |
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 |  | 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 |  | $ 108.42 |

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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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