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Revenue From Contracts With Customers (Tables)
 9 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Summary of disaggregation of revenue The following table is a summary of net revenues by geographic area (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
North America$479 $12,182 $37,920 $32,984 
Latin America7,925 22,720 22,695 50,572 
Asia Pacific3,777 2,744 15,696 8,287 
Europe3,011 8,335 12,997 24,850 
Middle East306 3,899 2,202 6,364 
Africa344 2,874 1,939 7,541 
Other392 485 1,930 1,372 
Total$16,234 $53,239 $95,379 $131,970 
Schedule of contract with customer, asset and liability The following table is a summary of unbilled receivables (in thousands):
September 30, 2020December 31, 2019
New Venture$4,144 $5,222 
Imaging and Reservoir Services3,705 6,539 
Devices1,780 54 
Total$9,629 $11,815 
The changes in unbilled receivables are as follows (in thousands):
 Unbilled receivables at December 31, 2019$11,815 
 Recognition of unbilled receivables (a)
91,024 
 Revenues billed to customers (a)
(93,210)
Unbilled receivables at September 30, 2020$9,629 
(a) Includes all gross revenue recognition and related billing activity of the Company. As a matter of process, all net revenue recognized is initially reflected as an unbilled receivable and subsequently billed to customers, as applicable, including net revenue for all of software and a portion of devices within the Operations Optimization segment, although they are billed at the time of recognition. The following table is a summary of deferred revenues (in thousands):
September 30, 2020December 31, 2019
New Venture$500 $1,956 
Imaging and Reservoir Services608 1,501 
Optimization Software & Services1,000 642 
Devices48 452 
Total $2,156 $4,551 
The changes in deferred revenues are as follows (in thousands):
Deferred revenue at December 31, 2019$4,551 
Cash collected in excess of revenue recognized1,961 
Recognition of deferred revenue (a)
(4,356)
Deferred revenue at September 30, 2020$2,156 
(a) The majority of deferred revenue recognized relates to Company’s Ventures group.