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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Components of expenses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
Employee Stock Option Exercise Cash Bonus [Line Items]
Bonus expense	$ 48,416
Cost of revenue, net
Employee Stock Option Exercise Cash Bonus [Line Items]
Bonus expense	13,708
Research and development
Employee Stock Option Exercise Cash Bonus [Line Items]
Bonus expense	8,550
General and administrative
Employee Stock Option Exercise Cash Bonus [Line Items]
Bonus expense	21,174
Sales and marketing
Employee Stock Option Exercise Cash Bonus [Line Items]
Bonus expense	$ 4,984

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- Definition

Employee Stock Option Exercise Cash Bonus [Line Items]

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Amount of expense for employee benefit and equity-based compensation.

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