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Revenue and Deferred Revenue
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue and Deferred Revenue Revenue and Deferred Revenue
Deferred revenue relates to performance obligations for which payments have been received from the customer prior to revenue recognition. Deferred revenue primarily consists of deferred subscription-based services. Deferred revenue also includes amounts allocated to the unspecified upgrades and enhancements and the Company’s cloud-based services. The Company had no material contract assets.
The following table summarizes the changes in the deferred revenue balance for the nine months ended September 30, 2021 and 2020:
Nine Months Ended September 30, 2021 Nine Months Ended September 30, 2020
(in thousands)
Deferred revenue, beginning of period$26,276 $14,566 
Recognition of revenue included in beginning of period
deferred revenue
(21,910)(12,227)
Revenue deferred, net of revenue recognized on contracts in
the respective period
25,475 17,552 
Deferred revenue, end of period$29,841 $19,891 
As of September 30, 2021, the aggregate amount of the transaction price allocated to remaining performance obligations was equal to the deferred revenue balance.
The Company expects the following recognition of deferred revenue as of September 30, 2021:
Year Ended December 31,
2021 (remainder of year)202220232024Total
(in thousands)
Revenue expected to be recognized$22,779 $3,765 $2,709 $588 $29,841 
The Company’s revenue from contracts with customers disaggregated by major product lines, excluding sales-based taxes, are included in Note 13 under the heading “Segment Information.”
Revenue recognized during the three and nine months ended September 30, 2021 related to performance obligations satisfied or partially satisfied in prior periods was $0.1 million and $0.8 million, respectively.
The following table presents the total revenue by geography based on the ship-to address for the periods indicated:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
(in thousands)
North America*$228,858 $194,116 $825,368 $553,556 
International31,228 14,889 93,033 34,508 
Total revenue$260,086 $209,005 $918,401 $588,064 
*Consists of United States and Canada