REVENUE RECOGNITION (Tables)

12 Months Ended

Dec. 31, 2020

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 December 31, 2020
Accounts receivable	$	82,261
Short-term unbilled receivables		6,659
Long-term unbilled receivables		3,770
Short-term deferred revenue		105,215
Long-term deferred revenue		57,086

Summary of Significant Changes in Unbilled Receivables and Deferred Liabilities Balances

Significant changes in the unbilled receivables and deferred liabilities balances for the years ended December 31, 2020 and 2019, are as follows (in thousands):

	Year Ended December 31, 2020
	Unbilled Receivables			Deferred Revenue
Balance at December 31, 2019	$	1,362		$	(144,862	)
Revenue recognized that was previously included in deferred revenue		—			157,704
Increases due to cash received		—			(192,369	)
Cumulative catch-up adjustment arising from changes in estimates of    transaction price		—			17,226
Unbilled receivables recognized		9,067			—
Net change		9,067			(17,439	)
Balance at December 31, 2020	$	10,429		$	(162,301	)
	Year Ended December 31, 2019
	Unbilled Receivables			Deferred Revenue
Balance at December 31, 2018	$	1,020		$	(122,567	)
Revenue recognized that was previously included in deferred revenue		—			133,394
Increases due to cash received		—			(157,321	)
Cumulative catch-up adjustment arising from changes in estimates of    transaction price		—			1,632
Unbilled receivables recognized		1,834			—
Transferred to receivables from unbilled receivables		(1,492	)		—
Net change		342			(22,295	)
Balance at December 31, 2019	$	1,362		$	(144,862	)