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Revenue
 6 Months Ended
Jun. 30, 2025
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
The following table presents a summary of revenue:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2025202420252024
Subscription revenue$228,031 $202,538 $448,474 $400,173 
Perpetual license and maintenance revenue11,411 12,016 22,963 24,172 
Professional services and other revenue7,853 6,687 14,995 12,857 
Revenue$247,295 $221,241 $486,432 $437,202 
Concentrations
We sell and market our products and services through our field sales force that works closely with our channel partners, which includes a network of distributors and resellers, in developing sales opportunities. We use a two-tiered channel model whereby we sell our products and services to our distributors, which in turn sell to resellers, which then sell to end users. Revenue derived through our channel network comprised 94% of revenue in the three and six months ended June 30, 2025 and 94% and 92% of revenue in the three and six months ended June 30, 2024, respectively. One of our distributors accounted for 32% of revenue in the three and six months ended June 30, 2025 and 34% of revenue in the three and six months ended June 30, 2024. That same distributor accounted for 31% and 29% of accounts receivable at June 30, 2025 and December 31, 2024, respectively.
Contract Balances
We generally bill our customers in advance and accounts receivable are recorded when we have the right to invoice the customer. Contract liabilities consist of deferred revenue and include customer billings and payments received in advance of performance under the contract. In the three months ended June 30, 2025 and 2024 and the six months ended June 30, 2025 and 2024, we recognized revenue of $231.1 million, $205.1 million, $412.0 million and $368.7 million, respectively, that was included in the deferred revenue balance at the beginning of each respective period.
Remaining Performance Obligations
The following summarizes the future estimated revenue related to unsatisfied performance obligations:
June 30,
(in thousands)20252024
Remaining performance obligations, short-term$641,918 $572,015 
Remaining performance obligations, long-term247,225 175,526 
Remaining performance obligations$889,143 $747,541 
Deferred Commissions
The following summarizes the activity of deferred incremental costs of obtaining a contract:
Three Months Ended June 30,Six Months Ended June 30,
(in thousands)2025202420252024
Beginning balance$116,829 $117,615 $119,705 $121,953 
Capitalization of contract acquisition costs12,544 11,466 23,738 20,501 
Amortization of deferred contract acquisition costs(14,314)(13,552)(28,384)(26,925)
Ending balance$115,059 $115,529 $115,059 $115,529