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STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Aggregate Intrinsic Value |  |  |
Share price (in usd per share) | $ 182.94 |  |
Restricted stock units |  |  |
Number of Shares Outstanding |  |  |
Outstanding, beginning balance (in shares) | 3,588 | 4,263 | 4,352
Granted (in shares) | 1,301 | 1,550 | 2,112
Vested (in shares) | (1,979) | (2,085) | (1,707)
Canceled (in shares) | (124) | (140) | (494)
Outstanding, ending balance (in shares) | 2,786 | 3,588 | 4,263
Number of shares outstanding, expected to vest (in shares) | 2,786 |  |
Weighted Average Fair Value per Share at Grant Date |  |  |
Outstanding, beginning balance (in usd per share) | $ 27.61 | $ 7.19 | $ 3.52
Granted (in usd per share) | 179.88 | 55.66 | 11.50
Vested (in usd per share) | 20.47 | 7.26 | 3.87
Canceled (in usd per share) | 88.50 | 19.47 | 4.81
Outstanding, ending balance (in usd per share) | 100.73 | $ 27.61 | $ 7.19
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) | $ 100.73 |  |
Weighted-Average Remaining Contractual Term |  |  |
Outstanding | 1 year 2 months 12 days |  |
Expected to vest | 1 year 2 months 12 days |  |
Aggregate Intrinsic Value |  |  |
Vested | $ 364,665 | $ 125,578 | $ 27,156
Outstanding | 509,864 |  |
Aggregate intrinsic value, expected to vest | $ 509,864 |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited 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)(1)(iv)(3) -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 Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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