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REVENUE (Tables)
 9 Months Ended
Sep. 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 nine months ended September 30, 2022 and 2021 (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
 2022202120222021
Subscriptions$41,782 $28,008 $108,878 $74,384 
Maintenance27,280 30,702 83,382 90,997 
Integrated solutions & other33,923 42,930 109,054 125,499 
Total net revenues$102,985 $101,640 $301,314 $290,880 
Revenue by Geographic Region
The following table sets forth our revenues by geographic region for the three and nine months ended September 30, 2022 and 2021 (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
 2022202120222021
Revenues:  
United States$46,206 $45,026 $130,755 $126,084 
Europe, Middle East and Africa36,865 38,782 112,026 109,400 
Asia-Pacific13,747 12,610 39,066 40,366 
Other Americas6,167 5,222 19,467 15,030 
Total net revenues$102,985 $101,640 $301,314 $290,880 
Contract Asset
Contract Asset

Contract asset activity for the nine months ended September 30, 2022 and 2021 was as follows (in thousands):
September 30, 2022September 30, 2021
Contract asset at beginning of period$25,397 $18,579 
Revenue in excess of billings51,400 43,757 
Customer billings(47,427)(39,724)
Contract asset at end of period$29,370 $22,612 
Less: long-term portion (recorded in other long-term assets)11,642 — 
Contract asset, current portion$17,728 $22,612 
Deferred Revenue
Deferred revenue activity for the nine months ended September 30, 2022 and 2021 was as follows (in thousands):
September 30, 2022September 30, 2021
Deferred revenue at beginning of period$98,082 $99,258 
Billings deferred57,094 56,846 
Recognition of prior deferred revenue(78,501)(69,337)
Deferred revenue at end of period$76,675 $86,767 

A summary of the significant performance obligations included in deferred revenue is as follows (in thousands):
September 30, 2022
Product$7,922 
Subscription8,545 
Maintenance contracts55,435 
Implied PCS4,293 
Professional services, training and other480 
Deferred revenue at September 30, 2022
$76,675