REVENUE RECOGNITION - Summary of Significant Changes in Unbilled Receivables and Deferred Liabilities Balances (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Deferred Revenue (Increase) Decrease
Balance at December 31, 2020	$ (162,301)	$ (144,862)
Revenue recognized that was previously included in deferred revenue	81,458	48,249
Increases due to cash received	(92,816)	(75,683)
Cumulative catch-up adjustment arising from changes in estimates of transaction price	4,507	829
Net change	(6,851)	(26,605)
Balance at June 30, 2021	(169,152)	(171,467)
Unbilled Receivables Increase (Decrease)
Balance at December 31, 2020	10,429	1,362
Unbilled receivables recognized	25,028	9,566
Transferred to receivables from unbilled receivables	(6,000)
Net change	19,028	9,566
Balance at June 30, 2021	$ 29,457	$ 10,928

Increase (decrease) in unbilled receivables.

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- Definition

Increases due to cash received.

+ References

No definition available.

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- Definition

Net increase (decrease) in deferred revenue.

+ References

No definition available.

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- Definition

Transferred to receivables from unbilled receivables.

+ References

No definition available.

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- Definition

Unbilled receivables increase (decrease), net.

+ References

No definition available.

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- 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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
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- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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-Section 45
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- References

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- Definition

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 912
-SubTopic 310
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