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REVENUE - Revenue by Service (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 140,664	$ 103,968	$ 90,452
Online
Disaggregation of Revenue [Line Items]
Revenue	140,664	97,440	64,378
In-person
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 6,528	$ 26,074

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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