STOCK-BASED COMPENSATION - Schedule of Weighted-Average Assumptions for Options and ESPP Subscriptions Granted Granted (Details) - $ / shares	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	0.30%	1.80%	0.30%	2.30%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility (as a percent)	33.40%	29.70%	34.20%	29.60%
Expected term	5 years 2 months 12 days	5 years 2 months 12 days	5 years 1 month 6 days	5 years 1 month 6 days
Fair value, per option (in dollars per share)	$ 22.24	$ 19.36	$ 22.19	$ 18.10
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	0.10%	2.00%	1.30%	2.40%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Expected volatility (as a percent)	37.50%	32.00%	33.10%	27.10%
Expected term	8 months 12 days	8 months 12 days	7 months 6 days	7 months 6 days
Fair value, per option (in dollars per share)	$ 21.79	$ 19.10	$ 16.61	$ 16.43

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.

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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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- Definition

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

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- Definition

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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No definition available.

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- Definition

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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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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