REVENUE RECOGNITION (Tables)

9 Months Ended

Sep. 30, 2021

Revenue From Contract With Customer [Abstract]

Schedule of Assets and Liabilities Associated with Contracts from Customers

The following table provides information about assets and liabilities associated with our contracts from customers (in thousands):

	As of September 30, 2021
Accounts receivable	$	96,235
Short-term unbilled receivables		27,491
Long-term unbilled receivables		—
Short-term deferred revenue		123,475
Long-term deferred revenue		43,458

Summary of Significant Changes in Unbilled Receivables and Deferred Liabilities Balances

Significant changes in the unbilled receivables and deferred liabilities balances for the nine months ended September 30, 2021 and 2020, are as follows (in thousands):

	Nine Months Ended September 30, 2021
	Unbilled Receivables			Deferred Revenue
Balance at December 31, 2020	$	10,429		$	(162,301	)
Revenue recognized that was previously included in deferred revenue, net		—			145,535
Increases due to cash received		—			(160,021	)
Cumulative catch-up adjustment arising from changes in estimates of    transaction price, net		—			9,854
Unbilled receivables recorded, net		24,209
Transferred to receivables from unbilled receivables		(7,147	)		—
Net change		17,062			(4,632	)
Balance at September 30, 2021	$	27,491		$	(166,933	)

	Nine Months Ended September 30, 2020
	Unbilled Receivables		Deferred Revenue
Balance at December 31, 2019	$	1,362	$	(144,862	)
Revenue recognized that was previously included in deferred revenue, net		—		97,556
Increases due to cash received		—		(144,200	)
Cumulative catch-up adjustment arising from changes in estimates of    transaction price, net		—		1,458
Unbilled receivables recorded, net		13,494		—
Net change		13,494		(45,186	)
Balance at September 30, 2020	$	14,856	$	(190,048	)