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STOCK-BASED COMPENSATION - Fair Value and Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Option Plan Shares |  |  |
Valuation assumptions |  |  |
Risk-free interest rates, minimum (as a percent) |  | 0.11% |
Risk-free interest rates, maximum (as a percent) |  | 1.47% |
Expected volatility, minimum (as a percent) |  | 44.19% |
Expected volatility, maximum (as a percent) |  | 77.51% |
Dividend yield (as a percent) |  | 0.00% |
Aggregate Intrinsic Value |  |  |
Weighted average fair value per share of options granted during the period (in dollars per share) |  | $ 58.57 |
Option Plan Shares | Minimum |  |  |
Valuation assumptions |  |  |
Expected term (in years) |  | 3 months |
Option Plan Shares | Maximum |  |  |
Valuation assumptions |  |  |
Expected term (in years) |  | 6 years 1 month 24 days |
Restricted Shares and RSUs |  |  |
Restricted Shares, RSUs, and Performance Share Units |  |  |
Outstanding at the beginning of the period (in shares) | 3,968,214 |  |
Granted (in shares) | 2,084,705 |  |
Assumed through acquisition (in shares) | 242,123 |  |
Released (in shares) | (1,582,760) |  |
Forfeited (in shares) | (406,201) |  |
Outstanding at the end of the period (in shares) | 4,306,081 |  | 3,968,214
Weighted Average Grant Date Fair Value |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 79.50 |  |
Granted (in dollars per share) | 133.80 |  |
Assumed through acquisition (in dollars per share) | 127.79 |  |
Released (in dollars per share) | 72.28 |  |
Forfeited (in dollars per share) | 99.94 |  |
Outstanding at the end of the period (in dollars per share) | $ 109.23 |  | $ 79.50
Fair value of equity instruments other than options vested in period | $ 114,400 | $ 79,100 |
Restricted Stock Units |  |  |
Weighted Average Grant Date Fair Value |  |  |
Granted (in dollars per share) |  | $ 90.95 |
Performance Share Units |  |  |
Restricted Shares, RSUs, and Performance Share Units |  |  |
Outstanding at the beginning of the period (in shares) | 618,515 |  |
Granted (in shares) | 253,120 |  |
Released (in shares) | 0 |  |
Forfeited (in shares) | (8,991) |  |
Outstanding at the end of the period (in shares) | 862,644 |  | 618,515
Weighted Average Grant Date Fair Value |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 93.22 |  |
Granted (in dollars per share) | 140.96 | $ 90.17 |
Released (in dollars per share) | 0 |  |
Forfeited (in dollars per share) | 68.23 |  |
Outstanding at the end of the period (in dollars per share) | $ 107.49 |  | $ 93.22
Number of outstanding performance share units (in shares) | 249,695 |  |
Employee stock |  |  |
Valuation assumptions |  |  |
Risk-free interest rates, minimum (as a percent) | 0.04% | 0.12% |
Risk-free interest rates, maximum (as a percent) | 0.16% | 0.20% |
Expected volatility, minimum (as a percent) | 48.38% | 63.67% |
Expected volatility, maximum (as a percent) | 68.51% | 89.04% |
Dividend yield (as a percent) | 0.00% | 0.00% |
Employee stock | Minimum |  |  |
Valuation assumptions |  |  |
Expected term (in years) | 6 months | 6 months |
Employee stock | Maximum |  |  |
Valuation assumptions |  |  |
Expected term (in years) | 2 years | 2 years |
Stock Plans |  |  |
Shares |  |  |
Outstanding at the beginning of the period (in shares) | 2,231,059 |  |
Granted (in shares) | 0 |  |
Assumed through acquisition (in shares) | 1,393,748 |  |
Exercised (in shares) | (1,208,355) |  |
Forfeited (in shares) | (36,909) |  |
Outstanding at the end of the period (in shares) | 2,379,543 |  | 2,231,059
Vested and expected to vest at end of period (in shares) | 2,379,543 |  |
Exercisable at the end of the period (in shares) | 1,816,492 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 39.67 |  |
Granted (in dollars per share) | 0 |  |
Assumed through acquisition (in dollars per share) | 5.51 |  |
Exercised (in dollars per share) | 11.09 |  |
Forfeited (in dollars per share) | 62.85 |  |
Outstanding at the end of the period (in dollars per share) | 33.81 |  | $ 39.67
Vested and expected to vest at end of period (in dollars per share) | 33.81 |  |
Exercisable at the end of the period (in dollars per share) | $ 25.17 |  |
Weighted Average Remaining Contractual Term |  |  |
Outstanding | 5 years 7 months 6 days |  | 6 years
Vested and expected to vest at end of period | 5 years 7 months 6 days |  |
Exercisable at the end of the period | 4 years 10 months 24 days |  |
Aggregate Intrinsic Value |  |  |
Outstanding at the end of the period | $ 147,337 |  |
Vested and expected to vest at end of period | 147,337 |  |
Exercisable at the end of the period | 127,826 |  |
Total intrinsic value of options exercised | $ 148,800 | $ 29,000 |

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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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(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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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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