REVENUE RECOGNITION (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2021
Accounts receivable	$	91,327
Short-term unbilled receivables		24,900
Long-term unbilled receivables		—
Short-term deferred revenue		128,546
Long-term deferred revenue		49,578

Summary of Significant Changes in Unbilled Receivables and Deferred Liabilities Balances

Significant changes in the unbilled receivables and deferred liabilities balances for the three months ended March 31, 2021 and 2020, are as follows (in thousands):

	Three Months Ended March 31, 2021
	Unbilled Receivables			Deferred Revenue
Balance at December 31, 2020	$	10,429		$	(162,301	)
Revenue recognized that was previously included in deferred revenue		—			33,439
Increases due to cash received		—			(53,000	)
Cumulative catch-up adjustment arising from changes in estimates of transaction price		—			3,738
Unbilled receivables recognized		20,471			—
Transferred to receivables from unbilled receivables		(6,000	)		—
Net change		14,471			(15,823	)
Balance at March 31, 2021	$	24,900		$	(178,124	)

	Three Months Ended March 31, 2020
	Unbilled Receivables		Deferred Revenue
Balance at December 31, 2019	$	1,362	$	(144,862	)
Revenue recognized that was previously included in deferred revenue		—		38,749
Increases due to cash received		—		(43,685	)
Cumulative catch-up adjustment arising from changes in estimates of transaction price		—		367
Unbilled receivables recognized		1,395		—
Net change		1,395		(4,569	)
Balance at March 31, 2020	$	2,757	$	(149,431	)