REVENUE RECOGNITION (Tables)

6 Months Ended

Jun. 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 June 30, 2021
Accounts receivable	$	99,629
Short-term unbilled receivables		29,357
Long-term unbilled receivables		100
Short-term deferred revenue		122,978
Long-term deferred revenue		46,174

Summary of Significant Changes in Unbilled Receivables and Deferred Liabilities Balances

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

	Six Months Ended June 30, 2021
	Unbilled Receivables			Deferred Revenue
Balance at December 31, 2020	$	10,429		$	(162,301	)
Revenue recognized that was previously included in deferred revenue		—			81,458
Increases due to cash received		—			(92,816	)
Cumulative catch-up adjustment arising from changes in estimates of transaction price		—			4,507
Unbilled receivables recognized		25,028			—
Transferred to receivables from unbilled receivables		(6,000	)		—
Net change		19,028			(6,851	)
Balance at June 30, 2021	$	29,457		$	(169,152	)

	Six Months Ended June 30, 2020
	Unbilled Receivables		Deferred Revenue
Balance at December 31, 2019	$	1,362	$	(144,862	)
Revenue recognized that was previously included in deferred revenue		—		48,249
Increases due to cash received		—		(75,683	)
Cumulative catch-up adjustment arising from changes in estimates of transaction price		—		829
Unbilled receivables recognized		9,566		—
Net change		9,566		(26,605	)
Balance at June 30, 2020	$	10,928	$	(171,467	)