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REVENUE - Contract Balances (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Change in contract liability
Beginning balance - Contract liability	$ 3,509	$ 5,942
Cash received in advance and not recognized as revenue	5,259	4,852
Amounts recognized as revenue as performance obligations satisfied	(2,500)	(8,262)
Ending balance - Contract liability	6,268	$ 2,532
Accrued expenses and other liabilities
Contract liabilities
Contract liabilities	$ 6,268		$ 3,509

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Advance payments received from customers not recognized as revenue.

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- Definition

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, and from current period increase in contract liability.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
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