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STOCKHOLDERS' EQUITY - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Number of Stock Options Outstanding
Beginning balance (in shares)	13,630,882
Granted (in shares)	198,771
Exercised (in shares)	(4,417,087)
Forfeited (in shares)	(2,895)
Ending balance (in shares)	9,409,671	13,630,882
Weighted Average Exercise Price
Beginning balance (in USD per share)	$ 17.84
Granted (in USD per share)	255.22
Exercised (in USD per share)	11.64
Forfeited (in USD per share)	71.99
Ending balance (in USD per share)	$ 25.75	$ 17.84
Options Exercisable
Options exercisable (in shares)	8,099,979
Options exercisable (in USD per share)	$ 15.57
Additional Disclosures
Weighted average remaining contractual term, options outstanding	4 years 2 months 8 days	3 years 10 months 2 days
Weighted average remaining contractual term, options exercisable	3 years 6 months 7 days
Aggregate intrinsic value, options outstanding	$ 2,017,556	$ 2,723,394
Aggregate intrinsic value, options exercisable	$ 1,816,899

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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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