REVENUE (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue by Type

The following table is a summary of our revenues by type for the three months ended March 31, 2021 and 2020 (in thousands):

	Three Months Ended March 31,
	2021		2020
Products and solutions net revenues	$	33,267	$	34,711
Subscription services	24,868		13,958
Maintenance	29,852		31,794
Professional services, training and other services	6,377		5,990
Total net revenues	$	94,364	$	86,453

Revenue by Geographic Region

The following table sets forth our revenues by geographic region for the three months ended March 31, 2021 and 2020 (in thousands):

	Three Months Ended March 31,
	2021		2020
Revenues:
United States	$	39,471	$	36,090
Other Americas	5,179		5,450
Europe, Middle East and Africa	36,523		33,235
Asia-Pacific	13,191		11,678
Total net revenues	$	94,364	$	86,453

Contract Asset

Contract Asset

Contract asset activity for the three months ended March 31, 2021 and 2020 was as follows (in thousands):

	March 31, 2021		March 31, 2020
Contract asset at beginning of year	$	18,579	$	19,494
Revenue in excess of billings	14,395		7,878
Customer billings	(11,019)		(5,210)
Contract asset at end of period	$	21,955	$	22,162

Deferred Revenue

Deferred revenue activity for the three months ended March 31, 2021 and 2020 was as follows (in thousands):

	March 31, 2021		March 31, 2020
Deferred revenue at beginning of period	$	99,259	$	97,901
Billings deferred	31,132		28,687
Recognition of prior deferred revenue	(32,885)		(31,176)
Deferred revenue at end of period	$	97,506	$	95,412

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

	March 31, 2021
Product	$	6,852
Subscription	5,718
Maintenance contracts	75,174
Implied PCS	7,652
Professional services, training and other	2,110
Deferred revenue at March 31, 2021	$	97,506