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REVENUE - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Deferred revenue	$ 18,700		$ 18,700		$ 25,000
Deferred revenue, revenue recognized during period	200	$ 5	24,600	$ 200
COVID-19
Disaggregation of Revenue [Line Items]
Deferred revenue	17,800		17,800
Deferred revenue, revenue recognized during period	100		24,300
Variable consideration
Disaggregation of Revenue [Line Items]
Revenue recognized (downward adjustments) from changes in transaction prices	$ (200)	$ 500	$ (13,200)	$ 9,100

X

- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained.

+ References

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-Publisher FASB
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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