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REVENUE (Tables)
 6 Months Ended
Jun. 30, 2022
Revenue from Contract with Customer [Abstract]  
Revenue by Type
The following table is a summary of our revenues by type for the three and six months ended June 30, 2022 and 2021 (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Subscriptions$34,142 $21,508 $67,096 $46,376 
Maintenance27,775 30,443 56,102 60,295 
Integrated solutions & other35,763 42,925 75,131 82,569 
Total net revenues$97,680 $94,876 $198,329 $189,240 
Revenue by Geographic Region
The following table sets forth our revenues by geographic region for the three and six months ended June 30, 2022 and 2021 (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
 2022202120222021
Revenues:  
United States$40,160 $41,587 $84,549 $81,058 
Europe, Middle East and Africa36,316 34,094 75,161 70,617 
Asia-Pacific12,798 14,566 25,319 27,756 
Other Americas8,406 4,629 13,300 9,809 
Total net revenues$97,680 $94,876 $198,329 $189,240 
Contract Asset
Contract Asset

Contract asset activity for the six months ended June 30, 2022 and 2021 was as follows (in thousands):
June 30, 2022June 30, 2021
Contract asset at beginning of period$25,397 $18,579 
Revenue in excess of billings19,735 27,282 
Customer billings(14,858)(24,033)
Contract asset at end of period$30,274 $21,828 
Less: long-term portion (recorded in other long-term assets)9,324 — 
Contract asset, current portion$20,950 $21,828 
Deferred Revenue
Deferred revenue activity for the six months ended June 30, 2022 and 2021 was as follows (in thousands):
June 30, 2022June 30, 2021
Deferred revenue at beginning of period$98,082 $99,259 
Billings deferred45,192 45,192 46,686 
Recognition of prior deferred revenue(62,341)(54,362)
Deferred revenue at end of period$80,933 $91,583 

A summary of the significant performance obligations included in deferred revenue is as follows (in thousands):
June 30, 2022
Product$7,373 
Subscription6,887 
Maintenance contracts59,994 
Implied PCS4,717 
Professional services, training and other1,962 
Deferred revenue at June 30, 2022
$80,933