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STOCK-BASED COMPENSATION - Schedule of Weighted-Average Assumptions for Options and ESPP Subscriptions Granted Granted (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	0.60%	1.40%
Expected dividend yield	0.00%	0.00%
Expected volatility (as a percent)	33.40%	29.70%
Expected term	5 years 2 months 12 days	5 years 2 months 12 days
Fair value, per option (in dollars per share)	$ 26.28	$ 22.79
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	0.10%	1.60%
Expected dividend yield	0.00%	0.00%
Expected volatility (as a percent)	37.50%	31.90%
Expected term	7 months 6 days	7 months 6 days
Fair value, per option (in dollars per share)	$ 22.14	$ 15.71

X

- 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

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-Publisher FASB
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- Definition

The estimated measure of the 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.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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