STOCK PLANS - Valuation Assumptions (Details) - $ / shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Stock options
Weighted Average Assumptions Used to Estimate the Fair Values of Each Option Grant
ESPP share option fair value (in dollars per share)	$ 26.74	$ 22.40	$ 20.92
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate, minimum	0.43%	0.22%	1.33%
Risk-free interest rate, maximum	1.21%	1.60%	2.54%
Expected volatility	49.10%	53.50%	53.90%
Expected term of options	5 years 4 months 9 days	5 years 4 months 9 days	5 years 2 months 19 days
ESPP
Weighted Average Assumptions Used to Estimate the Fair Values of Each Option Grant
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate, minimum	0.50%	0.14%	2.10%
Risk-free interest rate, maximum	0.90%	1.57%	2.56%
Expected volatility	37.00%	44.90%	40.20%
Expected term of options	6 months	6 months	6 months
ESPP \| Minimum
Weighted Average Assumptions Used to Estimate the Fair Values of Each Option Grant
ESPP share option fair value (in dollars per share)	$ 15.16	$ 11.02	$ 11.13
ESPP \| Maximum
Weighted Average Assumptions Used to Estimate the Fair Values of Each Option Grant
ESPP share option fair value (in dollars per share)	$ 15.23	$ 17.54	$ 11.36

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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.

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

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No definition available.

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- Definition

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

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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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