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REVENUE (Tables)

3 Months Ended

Mar. 31, 2022

The following table is a summary of our revenues by type for the three months ended March 31, 2022 and 2021 (in thousands):

The following table sets forth our revenues by geographic region for the three months ended March 31, 2022 and 2021 (in thousands):


	Three Months Ended March 31,
	2022		2021
Revenues:
United States	$	44,389	$	39,471
Other Americas	4,894		5,179
Europe, Middle East and Africa	38,845		36,523
Asia-Pacific	12,521		13,191
Total net revenues	$	100,649	$	94,364

Contract asset activity for the three months ended March 31, 2022 and 2021 was as follows (in thousands):


	March 31, 2022		March 31, 2021
Contract asset at beginning of period	$	25,397	$	18,579
Revenue in excess of billings	9,891		14,395
Customer billings	(2,657)		(11,019)
Contract asset at end of period	$	32,631	$	21,955
Less: long-term portion (recorded in other long-term assets)	7,089		—
Contract asset, current portion	$	25,542	$	21,955

Deferred revenue activity for the three months ended March 31, 2022 and 2021 was as follows (in thousands):


	March 31, 2022		March 31, 2021
Deferred revenue at beginning of period	$	98,082	$	99,259
Billings deferred	29,506		31,132
Recognition of prior deferred revenue	(35,266)		(32,885)
Deferred revenue at end of period	$	92,322	$	97,506

A summary of the significant performance obligations included in deferred revenue is as follows (in thousands):


	March 31, 2022
Product	$	6,210
Subscription	6,719
Maintenance contracts	71,294
Implied PCS	5,200
Professional services, training and other	2,899
Deferred revenue at March 31, 2022	$	92,322