STOCKHOLDERS' EQUITY - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2021
Number of Stock Options Outstanding
Beginning balance (in shares)	13,630,882
Exercised (in shares)	(2,592,301)
Ending balance (in shares)	11,038,581	13,630,882
Weighted Average Exercise Price
Beginning balance (in USD per share)	$ 17.84
Exercised (in USD per share)	12.69
Ending balance (in USD per share)	$ 17.84	$ 17.84	$ 19.06
Options Exercisable
Options exercisable (in shares)			9,605,627
Options exercisable (in USD per share)			$ 12.66
Additional Disclosures
Weighted average remaining contractual term, options outstanding	4 years 2 months 4 days	3 years 10 months 2 days
Weighted average remaining contractual term, options exercisable	3 years 6 months 3 days
Aggregate intrinsic value, options outstanding		$ 2,723,394	$ 2,295,969
Aggregate intrinsic value, options exercisable			$ 2,059,368

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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