STOCKHOLDERS' EQUITY - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Number of Stock Options Outstanding
Beginning balance (in shares)	8,916,100
Granted (in shares)	264,897
Exercised (in shares)	(407,887)
Forfeited (in shares)	(44,692)
Ending balance (in shares)	8,728,418	8,916,100
Weighted Average Exercise Price
Beginning balance (in USD per share)	$ 26.09
Granted (in USD per share)	44.98
Exercised (in USD per share)	10.03
Forfeited (in USD per share)	55.37
Ending balance (in USD per share)	$ 27.27	$ 26.09
Options Exercisable
Options exercisable (in shares)	7,565,229
Options exercisable (in USD per share)	$ 18.10
Additional Disclosures
Weighted average remaining contractual term, options outstanding	3 years 7 months 17 days	3 years 10 months 20 days
Weighted average remaining contractual term, options exercisable	3 years 1 month 13 days
Aggregate intrinsic value, options outstanding	$ 970,780	$ 1,226,105
Aggregate intrinsic value, options exercisable	$ 894,398

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