Research and Development Expense Research and development expense consists primarily of personnel costs for our employees who develop and enhance our platform, including salaries, bonuses, stock-based compensation, and other personnel costs. Also included are non-personnel costs such as subcontracting, consulting, and professional fees to third party development resources, and allocated overhead costs.
Research and Development Expense Research and development expense consists primarily of personnel costs for our employees who develop and enhance our platform, including salaries, bonuses, stock-based compensation, and other personnel costs. Also included are non-personnel costs such as subcontracting, consulting, professional fees to third party development resources, and allocated overhead costs.
Factors considered when determining to incorporate variable consideration in the transaction price include, but are not limited to, whether the variable consideration is highly susceptible to factors outside of the Company's influence, the length of time the uncertainty surrounding reversal is expected to last, our experience levels with similar types of contracts, our historical practices for similar contracts in similar 55 circumstances, and the number and range of possible consideration amounts.
Factors considered when determining to incorporate variable consideration in the transaction price include, but are not limited to, whether the variable consideration is highly susceptible to factors outside of the Company's influence, the length of time the uncertainty surrounding reversal is expected to last, our experience levels with similar types of contracts, our historical practices for similar contracts in similar circumstances, and the number and range of possible consideration amounts.
Our cloud subscription revenue retention rate can fluctuate from period to period due to large customer contracts in any given period. Key Components of Results of Operations We generate revenue primarily through sales of subscriptions to our platform as well as professional services. We generally sell our software on a per-user basis or through non-user based single application licenses.
Our cloud subscriptions revenue retention rate can fluctuate from period to period due to large customer contracts in any given period. Key Components of Results of Operations Revenue We generate revenue primarily through sales of subscriptions to our platform as well as professional services. We generally sell our software on a per-user basis or through non-user-based single application licenses.
While these items may be recurring in nature and should not be disregarded in the evaluation of our earnings performance, it is useful to exclude such items when analyzing current results and trends compared to other periods as these items can vary significantly from period to period depending on specific underlying transactions or events that may occur.
While some of these items may be recurring in nature and should not be disregarded in the evaluation of our earnings performance, it is useful to exclude such items when analyzing current results and trends compared to other periods as these items can vary significantly from period to period depending on specific underlying transactions or events that may occur.
Our maintenance and support agreements provide customers with the right to unspecified software upgrades, maintenance releases and patches released 43 during the term of the maintenance and support agreement on a when-and-if-available basis, and rights to technical support. On-premises term license subscriptions are offered when the customer prefers to self-manage the deployment of our platform within their own infrastructure.
Our maintenance and support agreements provide customers with the right to unspecified software upgrades, maintenance releases and patches released during the term of the maintenance and support agreement on a when-and-if-available basis, and rights to technical support. On-premises term license subscriptions are offered when the customer prefers to self-manage the deployment of our platform within their own infrastructure.
Although we expect research and development expense to continue to increase in absolute dollars as such costs are critical to maintain and improve the quality of applications and our competitive position, we believe our new product development center will result in cost savings over time.
Although we expect research and development expense to continue to increase in absolute dollars as such costs are critical to maintain and improve the quality of applications and our competitive position, we believe our product development center will result in cost savings over time.
Many of our customers begin by building a single application and then grow to build dozens of applications on our platform. Generally, the development of new applications on our platform results in the expansion of our user base within an organization and a corresponding increase in revenue.
Many of our customers begin by building a 46 single application and then grow to build dozens of applications on our platform. Generally, the development of new applications on our platform results in the expansion of our user base within an organization and a corresponding increase in revenue.
General and Administrative Expense General and administrative expense consists primarily of personnel costs, including salaries, bonuses, stock-based compensation, and other personnel costs for our administrative, legal, information technology, human resources, finance and accounting, as well as our senior executives.
General and Administrative Expense General and administrative expense consists primarily of personnel costs, including salaries, bonuses, stock-based compensation, and other personnel costs for our administrative, legal, information technology, human resources, finance and accounting teams as well as our senior executives.
The SSP is the observable price at which we sell the product or service separately. In the absence of observable pricing, we estimate SSP using the residual approach. We establish SSP as follows: 1.
The SSP is the observable price at which we sell the product or service separately. In the absence of observable pricing, we estimate SSP using the residual approach. We establish SSP as follows: 62 1.
Revenue Our revenue is comprised of the following: Subscriptions Subscriptions revenue is primarily derived from cloud subscriptions bundled with maintenance and support and hosting services and on-premises term license subscriptions bundled with maintenance and support.
Our revenue is comprised of the following: 48 Subscriptions Subscriptions revenue is primarily derived from cloud subscriptions bundled with maintenance and support and hosting services and on-premises term license subscriptions bundled with maintenance and support.
We use these non-GAAP financial performance 50 measures for financial and operational decision-making and as a means to evaluate period-to-period comparisons. Management believes these non-GAAP financial measures provide meaningful supplemental information regarding our performance by excluding certain expenses that may not be indicative of its recurring core business operating results.
We use these non-GAAP financial performance measures for financial and operational decision-making and as a means to evaluate period-to-period comparisons. Management believes these non-GAAP financial measures provide meaningful supplemental information regarding our performance by excluding certain expenses that may not be indicative of our recurring core business operating results.
However, the amount of backlog relative to the total value of our contracts can change from quarter to quarter and year to year for several reasons, including the specific timing and duration of cloud and term license subscription agreements with large customers, the specific timing of customer renewals, changes in customer financial circumstances, and foreign currency fluctuations.
However, the amount of backlog relative to the total value of our contracts can change from quarter to quarter and year to year for several reasons, including the specific timing and duration of cloud and on-premises term license subscription agreements with large customers, the specific timing of customer renewals, changes in customer financial circumstances, and foreign currency fluctuations.
We believe our existing cash and cash equivalents and short-term investments and marketable securities, together with any positive cash flows from operations and available borrowings under our line of credit, will be sufficient to support working capital and capital expenditure requirements for at least the next 12 months.
We believe our existing cash and cash equivalents and short-term investments and marketable securities, together with any positive cash flows from operations and available borrowings under our line of credit, will be sufficient to support working capital and capital expenditure requirements for at least the next twelve months.
Cloud subscription revenue retention rate is then calculated by dividing the aggregate recurring cloud subscription revenue in the current trailing 12-month period by the previous trailing 12-month period. This calculation includes the combined impact on our revenue from customer non-renewals, pricing changes, and growth in the number of users on our platform.
Cloud subscriptions revenue retention rate is then calculated by dividing the aggregate recurring cloud subscriptions revenue in the current trailing 12-month period by the previous trailing 12-month period. This calculation includes the combined impact on our revenue from customer non-renewals, pricing changes, and growth in the number of users on our platform.
The Appian Platform includes everything you need to design, automate, and optimize even the most complex processes, from start to finish. The world's most innovative organizations trust Appian to improve their workflows, unify data, and optimize operations—resulting in better growth and superior customer experiences.
The Appian AI Process Platform includes everything you need to design, automate, and optimize even the most complex processes, from start to finish. The world's most innovative organizations trust Appian to improve their workflows, unify data, and optimize operations—resulting in better growth and superior customer experiences.
Over the last three completed fiscal years, we had an average cloud subscription gross revenue renewal rate of 99%, which is calculated by dividing (i) the cloud subscription revenue from renewing cloud customers in the current 12-month period that were cloud customers during the entirety of the prior 12-month period, giving effect to price increases but excluding additional cloud subscription for additional users, or upsells, by (ii) our cloud subscription revenue from all cloud customers in the corresponding prior 12-month period that were cloud customers during the entirety of such prior 12-month period.
Over the last three completed fiscal years, we had an average cloud subscription gross revenue renewal rate of 98%, which is calculated by dividing (i) the cloud subscriptions revenue from renewing cloud customers in the current 12-month period that were cloud customers during the entirety of the prior 12-month period, giving effect to price increases but excluding additional cloud subscriptions for additional users, or upsells, by (ii) our cloud subscriptions revenue from all cloud customers in the corresponding prior 12-month period that were cloud customers during the entirety of such prior 12-month period.
See Note 3 to the consolidated financial statements for further details on our revenue recognition policies. 42 Key Metrics We monitor the following metrics to help us measure and evaluate the effectiveness of our operations. All dollar amounts are presented in thousands.
See Note 3 to the consolidated financial statements for further details on our revenue recognition policies. 47 Key Metrics We monitor the following metrics to help us measure and evaluate the effectiveness of our operations. All dollar amounts are presented in thousands.
We calculate this metric over a set of customers who have been with us for at least one full year. To calculate our cloud subscription revenue retention rate for a particular trailing 12-month period, we first establish the recurring cloud subscription revenue for the previous trailing 12-month period.
We calculate this metric over a set of customers who have been with us for at least one full year. To calculate our cloud subscriptions revenue retention rate for a particular trailing 12-month period, we first establish the recurring cloud subscriptions revenue for the previous trailing 12-month period.
We measure the effectiveness of our business model by comparing the lifetime value of our customer relationships to our customer acquisition costs.
We also measure the effectiveness of our business model by comparing the lifetime value of our customer relationships to our customer acquisition costs.
We have aggressively invested, and intend to continue to invest, in our sales team in order to drive sales to new customers. We continue to make investments to enhance the expertise of our sales and marketing organization within our key industry verticals of financial services, government, and life sciences.
We have aggressively invested, and intend to continue to invest, in our sales team in order to drive sales to new customers. We continue to make investments to enhance the expertise of our sales and marketing organization within our key industry verticals of financial services, government, life sciences, insurance, and manufacturing.
Such a decline, however, will negatively affect our revenue in future periods. Accordingly, the effect of significant downturns in sales and market acceptance of our platform and potential changes in our rate of renewals may not be fully reflected in our results of operations until future periods.
Such a decline, however, will negatively affect our revenue in future periods. Accordingly, the effect of significant downturns in sales, the market acceptance of our platform, or potential changes in our rate of renewals may not be fully reflected in our results of operations until future periods.
We believe increasing cloud subscription revenue is an indicator of the demand for our platform, the pace at which the market for our solutions is growing, the productivity of our sales team and strategic relationships in growing our customer base, and our ability to further penetrate our existing customer base.
We believe increasing cloud subscriptions revenue is an indicator of the demand for our platform, the pace at which the market for our solutions is growing, the productivity of our sales team and strategic relationships in growing our customer base, and our ability to further penetrate our existing customer base.
Our cloud subscription revenue for any customer is primarily determined by the number of users who access and utilize the applications built on our platform or by the number of application licenses purchased, as well as the price paid.
Our cloud subscriptions revenue for any customer is primarily determined by the number of users who access and utilize the applications built on our platform or by the number of application licenses purchased, as well as the price paid.
This effectively represents recurring dollars we should expect in the current trailing 12-month period from the cohort of customers from the previous trailing 12-month period without any expansion or contraction. We subsequently measure the recurring cloud subscription revenue in the current trailing 12-month period from the cohort of customers from the previous trailing 12-month period.
This effectively represents recurring dollars we should expect in the current trailing 12-month period from the cohort of customers from the previous trailing 12-month period without any expansion or contraction. We subsequently measure the recurring cloud subscriptions revenue in the current trailing 12-month period from the cohort of customers from the previous trailing 12-month period.
We often sign multiple-year cloud subscription agreements. Backlog may vary based on changes in the average non-cancellable term of a cloud and on-premises term license subscription agreements. Non-GAAP Financial Measures To supplement its consolidated financial statements, which are prepared and presented in accordance with GAAP, we provide investors with certain non-GAAP financial performance measures.
We often sign multiple-year cloud subscription agreements. Backlog may vary based on changes in the average non-cancellable term of our cloud and on-premises term license subscription agreements. Non-GAAP Financial Measures To supplement our consolidated financial statements, which are prepared and presented in accordance with GAAP, we provide investors with certain non-GAAP financial performance measures.
We incur significant customer acquisition costs, including expenses associated with hiring new sales representatives, who can take anywhere from six months to a year to become productive given the length of our sales cycle, and marketing costs, with the exception of sales commissions, are expensed as incurred.
We incur significant customer acquisition costs, including expenses associated with hiring new sales representatives, who can take anywhere from six months to a year to become productive given the length of our sales cycle, and marketing costs which, with the exception of certain types of sales commissions, are expensed as incurred.
Therefore, while we may incur or recognize these types of expenses in the future, the Company believes removing these items for purposes of calculating the non-GAAP financial measures provides investors with a more focused presentation of our ongoing operating performance.
Therefore, while we may incur or recognize these types of expenses in the future, we believe removing these items for purposes of calculating our non-GAAP financial measures provides investors with a more focused presentation of our ongoing operating performance.
Cloud Subscription Revenue Retention Rate As of December 31, 2022 2021 2020 Cloud subscription revenue retention rate 115 % 116 % 119 % A key factor to our success is the renewal and expansion of subscription agreements with our existing customers.
Cloud Subscriptions Revenue Retention Rate As of December 31, 2023 2022 2021 Cloud subscriptions revenue retention rate 119 % 115 % 116 % A key factor to our success is the renewal and expansion of subscription agreements with our existing customers.
The amount of variable consideration excluded from the transaction price for the years ended December 31, 2022, 2021, and 2020 was insignificant. Allocating the Transaction Price Based on Standalone Selling Prices We allocate the transaction price to each performance obligation in a contract based on its relative standalone selling price, or SSP.
The amount of variable consideration excluded from the transaction price for the years ended December 31, 2023, 2022, and 2021 was immaterial. Allocating the Transaction Price Based on Standalone Selling Prices We allocate the transaction price to each performance obligation in a contract based on its relative standalone selling price, or SSP.
Year Ended December 31, 2021 Compared to the Year Ended December 31, 2020 For a discussion and analysis of changes in financial condition and results of operations for the year ended December 31, 2021 as compared to the year ended December 31, 2020, refer to our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, filed with the SEC on February 17, 2022.
Year Ended December 31, 2022 Compared to the Year Ended December 31, 2021 For a discussion and analysis of changes in financial condition and results of operations for the year ended December 31, 2022 as compared to the year ended December 31, 2021, refer to our Annual Report on Form 10-K for the fiscal year ended December 31, 2022, filed with the SEC on February 16, 2023.
Although we believe the estimates we use are reasonable, due to the inherent uncertainty involved in making those estimates, actual results reported in future periods could differ from those estimates. We believe the following accounting estimates involve a high degree of judgment and complexity.
Although we believe the estimates we use are reasonable, due to the inherent uncertainty involved in making those estimates, actual results reported in future periods could differ from those estimates. We believe the following accounting estimates embedded in our revenue recognition involve a high degree of judgment and complexity.
Professional services gross margin is also impacted by the amount of services performed by subcontractors and partners as opposed to internal resources. In 2021, we had a lower usage of subcontractors and performed fewer in-person professional services engagements and deployments, both of which reduced certain classes of expenses and improved professional services margins. In 2022, these margins began to decline.
Professional services gross margin is also impacted by the amount of services performed by subcontractors and partners as opposed to internal resources. In 49 2022, we had a lower usage of subcontractors and performed fewer in-person professional services engagements and deployments, both of which reduced certain classes of expenses and improved professional services margins.
Accordingly, these are the estimates we believe are the most critical to aid in fully understanding and evaluating our consolidated financial condition and results of our operations. This commentary should be read in conjunction with our consolidated financial statements and the remainder of this Form 10-K.
Accordingly, we believe the estimates included in our revenue recognition accounting are the most critical to aid in fully understanding and evaluating our consolidated financial condition and results of operations. This commentary should be read in conjunction with our consolidated financial statements and the remainder of this Form 10-K.
Backlog Backlog represents non-cancellable future amounts to be recognized under cloud and on-premises term license subscription agreements and is representative of our remaining performance obligations. As of December 31, 2022 and 2021, we had backlog of $376.5 million and $285.5 million, respectively. Approximately 35% of our backlog as of December 31, 2022 is not expected to be recognized in 2023.
Backlog Backlog represents non-cancellable future amounts to be recognized under cloud and on-premises term license subscription agreements and is representative of our remaining performance obligations. As of December 31, 2023 and 2022, we had backlog of $489.7 million and $376.5 million, respectively. Approximately 37% of our backlog as of December 31, 2023 is not expected to be recognized in 2024.
In 2023, we expect professional services gross margin to be consistent with 2022; however, the margin remains subject to fluctuation based on the factors discussed above. Operating Expenses 44 Operating expenses consist of sales and marketing, research and development, and general and administrative expenses.
In 2023, these margins began to decline. In 2024, we expect professional services gross margin to be consistent with 2023; however, the margin remains subject to fluctuation based on the factors discussed above. Operating Expenses Operating expenses consist of sales and marketing, research and development, and general and administrative expenses.
To further help strengthen our financial position and support our growth initiatives, on November 3, 2022 we entered into a new Senior Secured Credit Facilities Credit Agreement (the “Credit Agreement”) which provides for a five-year term loan facility in an aggregate principal amount of $100.0 million and, in addition, up to $50.0 million for a revolving credit facility, including a letter of credit sub-facility in the aggregate availability amount of $15.0 million and a swingline sub-facility in the aggregate availability amount of $10.0 million (as a sublimit of the revolving loan facility).
To further help strengthen our financial position and support our growth initiatives, in November 2022 we entered into a Senior Secured Credit Facilities Credit Agreement, or the Credit Agreement, which provides for a five-year term loan facility in an aggregate principal amount of $150.0 million and, in addition, up to $75.0 million for a revolving credit facility, including a letter of credit sub-facility in the aggregate availability amount of $15.0 million 59 and a swingline sub-facility in the aggregate availability amount of $10.0 million (as a sublimit of the revolving loan facility).
Professional Services Gross Margin Professional services gross margin is affected by the growth in our professional services revenue as compared to the growth in, and timing of, the cost of our Customer Success organization as we continue to invest in the growth of our business.
Professional Services Gross Margin Professional services gross margin is affected by the growth in our professional services revenue as compared to the growth in, and timing of, the costs of our Customer Success organization as we continue to invest in the growth of our business, as well as by consultant utilization rates.
We intend to continue to invest in our 40 business to take advantage of our market opportunity. As a result, we incurred net losses of $150.9 million, $88.6 million, and $33.5 million in 2022, 2021, and 2020, respectively. We also used cash in operations of $106.6 million, $53.9 million, and $7.6 million in 2022, 2021, and 2020, respectively.
We intend to continue to invest in our business to take advantage of our market opportunity. As a result, we incurred net losses of $111.4 million, $150.9 million, and $88.6 million in 2023, 2022, and 2021, respectively. We also used cash in operations of $110.4 million, $106.6 million, and $53.9 million in 2023, 2022, and 2021, respectively.
Uses of Funds 53 Our current principal uses of cash are funding operations and other working capital requirements. Historically, we have also utilized cash to acquire complementary businesses, and we may pursue similar opportunities in the future.
Uses of Funds Our current principal uses of cash are funding operations and other working capital requirements. Historically, we have also utilized cash to pay for the acquisition of businesses that were complementary to ours, and we may pursue similar opportunities in the future.
With respect to new versus existing customers, $63.2 million of the increase in subscriptions revenue was derived from expanded deployments and corresponding sales of additional subscriptions to existing customers while $13.2 million was driven from sales of subscriptions to new customers.
With respect to new versus existing customers, $53.8 million of the increase in subscriptions revenue was derived from expanded deployments and corresponding sales of additional subscriptions to existing customers while $18.4 million was driven from sales of subscriptions to new customers.
Our cloud subscription revenue was $236.9 million, $179.4 million, and $129.2 million in 2022, 2021, and 2020, respectively. We have invested in developing our platform, expanding our sales and marketing and research and development capabilities, and providing general and administrative resources to support our growth.
Our cloud subscriptions revenue was $304.5 million, $236.9 million, and $179.4 million in 2023, 2022, and 2021, respectively. 45 We have invested in developing our platform, expanding our sales and marketing and research and development capabilities, and providing general and administrative resources to support our growth.
We also intend to continue to invest in sales and marketing as we further expand our sales teams, increase our marketing activities, and grow our international operations. Seasonality We have historically experienced seasonality in terms of when we enter into agreements with customers.
In addition, we may pursue strategic acquisitions that enhance our product offerings. We also intend to continue to invest in sales and marketing as we further expand our sales teams, increase our marketing activities, and grow our international operations. Seasonality We have historically experienced seasonality in terms of when we enter into agreements with customers.
Furthermore, we usually enter into a significant portion of agreements with customers during the last month of each quarter, and often the last two weeks of each quarter. However, we recognize the majority of our subscriptions revenue ratably over the terms of our subscription agreements, which are generally one to three years in length.
Furthermore, we usually enter into a significant portion of agreements with customers during the last month of each quarter and often the last two weeks of each quarter. However, we recognize the majority of our subscriptions revenue ratably over the terms of our subscription agreements.
We have several strategic partnerships, including with KPMG, Accenture, PwC, EY, Infosys, Wipro, and Deloitte, which allow them to refer customers to us in order to purchase subscriptions and then our partners provide professional services directly to the customers using our platform.
We have several strategic partnerships, including with Accenture, Capgemini, Deloitte, EY, KPMG, PwC, and TCS, which allow them to refer customers to us in order to purchase subscriptions. Our partners then provide professional services directly to the customers using our platform. We intend to continue focusing on adding new customers with our strategic partners.
The increase in subscriptions revenue was driven by a $57.5 million increase in cloud subscription revenue, a $16.6 million increase in on-premises software revenue, and a $2.4 million increase in maintenance and support revenue.
The increase in subscriptions revenue was driven by a $67.6 million increase in cloud subscriptions revenue, a $2.5 million increase in on-premises software revenue, and a $2.1 million increase in maintenance and support revenue.
The degree to which prospective customers recognize the need for our software platform that enables organizations to digitally transform, and subsequently allocate budget dollars to purchase our software, will drive our ability to acquire new customers and increase sales to existing customers, which, in turn, will affect our future financial performance. • Growth of Our Customer Base.
The degree to which prospective customers recognize the need for our software platform and its ability to enable their organizations to digitally transform, and subsequently allocate budget dollars to purchase our software, will drive our ability to acquire new customers and increase sales to existing customers, which, in turn, will affect our future financial performance. • Growth of Our Customer Base - We believe we have a substantial opportunity to grow our customer base.
Cloud Subscription Revenue Year Ended December 31, 2022 2021 2020 Cloud subscription revenue $ 236,922 $ 179,415 $ 129,219 Cloud subscription revenue includes cloud subscriptions bundled with maintenance and support and hosting services. In 2022, 2021, and 2020, 69.7%, 68.0%, and 65.0%, respectively, of subscriptions revenue was cloud subscription revenue.
Cloud Subscriptions Revenue Year Ended December 31, 2023 2022 2021 Cloud subscriptions revenue $ 304,481 $ 236,922 $ 179,415 Cloud subscriptions revenue includes cloud subscriptions bundled with maintenance and support and hosting services. In 2023, 2022, and 2021, 73.8%, 69.7%, and 68.0%, respectively, of subscriptions revenue was cloud subscriptions revenue.
On a rolling 12-month basis, we estimate that for each of the past five fiscal years, the average lifetime value of a customer has exceeded 7x the associated average cost of acquiring them, including the year ended December 31, 2022.
On a rolling 12-month basis, we estimate that for each of the past five fiscal years, the average lifetime value of a customer has been at least seven times greater than the associated average cost of acquiring them, including the year ended December 31, 2023.
As a result, we expect sales and marketing expense to increase in absolute dollars as we continue to invest to acquire new customers and further expand usage of our platform within our existing customer base.
We expect sales and marketing expense to increase in absolute dollars as we continue to invest to acquire new customers and further expand usage of our platform within our existing customer base. We will continue our efforts to build on our brand reputation and increase market awareness of our platform.
In addition, we continue to grow our base of strategic partners to provide broader customer coverage and solution delivery capabilities. These partners perform professional services with respect to any new service contracts they originate. As the usage of partners expands, we expect the proportion of our total revenue from subscriptions to increase over time relative to professional services.
These partners perform professional services with respect to any new service contracts they originate. As the usage of strategic partners expands, we expect the proportion of our total revenue from subscriptions to increase over time relative to professional services.
If we are unable to raise additional capital when desired, our business, operating results, and financial condition could be adversely affected. Sources of Funds We have historically financed our operations in large part with equity financing arrangements. Through 2022, we have completed four public offerings and received net proceeds of $344.8 million.
If we are unable to raise additional capital when desired, our business, operating results, and financial condition could be adversely affected. Sources of Funds We have historically financed our operations in large part with equity financing arrangements. Our last public offering was completed in June 2020, which was our fourth round of public offerings.
Other Expense, Net Year Ended December 31, 2022 2021 $ Change % Change (dollars in thousands) Other expense, net $ 3,545 $ 3,584 $ (39) (1.1)% % of revenue 0.8 % 1.0 % Other expense, net was $3.5 million in 2022 compared to other expense, net of $3.6 million in 2021.
Other (Income) Expense, Net Year Ended December 31, 2023 2022 $ Change % Change (dollars in thousands) Other (income) expense, net $ (17,603) $ 3,545 $ (21,148) *** % of revenue (3.2) % 0.8 % Other income, net was $17.6 million in 2023 compared to other expense, net of $3.5 million in 2022.
For a discussion and analysis of net cash used in or provided by operating, investing, and financing activities for the year ended December 31, 2020, refer to our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, filed with the SEC on February 17, 2022.
These decreases were partially offset by a $1.7 million decrease in payments for debt issuance costs. 61 For a discussion and analysis of net cash used in or provided by operating, investing, and financing activities for the year ended December 31, 2021, refer to our Annual Report on Form 10-K for the fiscal year ended December 31, 2022, filed with the SEC on February 16, 2023.
Our research and development efforts are focused on enhancing the capabilities, speed, and power of our software platform. The number of employees in research and development functions grew from 488 at December 31, 2021 to 652 at December 31, 2022. A portion of our headcount growth in 2022 was attributable to a new product development center opened in India.
Our research and development efforts are focused on enhancing the capabilities, speed, and power of our software platform. The number of employees in research and development functions grew from 652 at December 31, 2022 to 681 at December 31, 2023.
We may also elect to raise additional sources of funding through draws on our new revolving credit facility, entering into new debt financing arrangements, or conducting additional public offerings.
We expect future sources of funds to consist primarily of cash generated from sales of subscriptions and the related professional services. We may also elect to raise additional sources of funding through draws on our revolving credit facility, entering into new debt financing arrangements, or conducting additional public offerings.
Our customers include financial services, government, life sciences, insurance, manufacturing, energy, healthcare, telecommunications, and transportation organizations. Generally, our sales team targets its efforts to organizations with over 2,000 employees and $2 billion in annual revenue. Revenue from government agencies represented 19.2%, 19.6%, and 18.1% of our total revenue in 2022, 2021, and 2020, respectively.
As of December 31, 2023, we had approximately 1,000 customers. Our customers primarily include financial services, government, life sciences, insurance, manufacturing, energy, healthcare, telecommunications, and transportation organizations. Generally, our sales team targets its efforts to organizations with over 2,000 employees and $2 billion in annual revenue.
Personnel-related costs such as salaries, bonuses, commissions, payroll tax payments, and stock-based compensation expense are the most significant components of each of these expense categories.
Personnel-related costs such as salaries, bonuses, commissions, payroll tax payments, and stock-based compensation expense are the most significant components of each of these expense categories. Other components of each category include professional fees for third-party services such as legal, software development resources, and contractors.
Personnel costs increased due to an increase in sales and marketing personnel headcount of 32.2% from December 31, 2021 to December 31, 2022 in addition to increased wages and fringe benefits, increased sales commissions driven by both contracts with new customers and renewals with existing customers, and a $3.7 million increase in stock-based compensation expense.
Although there was a 8.8% decrease in sales and marketing personnel headcount from December 31, 2022 to December 31, 2023, personnel costs overall increased due to increased wages, a $7.4 million increase in sales commissions driven by both contracts with new customers and renewals with existing customers, a $4.7 million increase in severance expense, and a $1.7 million increase in stock-based compensation expense.
Additional expenses included in this category are non-personnel costs such as travel-related expenses, contracting and professional fees for such services as audits, taxation, and legal, insurance and other corporate expenses, including allocated overhead costs, and bad debt expenses. The number of employees in general and administrative functions grew from 224 at December 31, 2021 to 316 at December 31, 2022.
Additional expenses included in this category are non-personnel costs such as travel-related expenses, contracting and professional fees for such 50 services as audits, taxation, and legal, insurance and other corporate expenses, including allocated overhead costs, and bad debt expenses.
During the initial period of deployment by a customer, we generally provide a greater amount of support in building applications and training than later in the deployment, with a typical engagement lasting from two to six months. At the same time, many of our customers have historically purchased subscriptions only for a limited set of their total potential end users.
During the initial period of deployment of our platform by a customer, we generally provide a greater amount of support in building applications and training than later in the deployment, with a typical engagement lasting from two to six months.
Results of Operations The following table sets forth our consolidated statements of operations data (in thousands): Year Ended December 31, 2022 2021 2020 Revenue Subscriptions $ 340,152 $ 263,738 $ 198,710 Professional services 127,839 105,521 105,863 Total revenue 467,991 369,259 304,573 Cost of revenue Subscriptions (1) 36,005 27,330 20,826 Professional services (1) 97,301 76,763 67,940 Total cost of revenue 133,306 104,093 88,766 Gross profit 334,685 265,166 215,807 Operating expenses Sales and marketing (1) 220,374 167,852 130,316 Research and development (1) 139,210 97,517 70,241 General and administrative (1) 120,111 83,704 53,152 Total operating expenses 479,695 349,073 253,709 Operating loss (145,010) (83,907) (37,902) Other non-operating expense (income) Other expense (income), net 3,545 3,584 (5,786) Interest expense 1,673 372 478 Total other non-operating expense (income) 5,218 3,956 (5,308) Loss before income taxes (150,228) (87,863) (32,594) Income tax expense 692 778 883 Net loss $ (150,920) $ (88,641) $ (33,477) (1) Stock-based compensation as a component of these line items is as follows: 46 Year Ended December 31, 2022 2021 2020 (in thousands) Cost of revenue Subscriptions $ 996 $ 1,199 $ 943 Professional services 5,309 3,131 1,477 Operating expenses Sales and marketing 9,152 5,426 2,821 Research and development 12,523 5,224 2,718 General and administrative 10,850 8,864 7,320 Total stock-based compensation expense $ 38,830 $ 23,844 $ 15,279 The following table sets forth our consolidated statements of operations data expressed as a percentage of total revenue: Year Ended December 31, 2022 2021 2020 Revenue Subscriptions 72.7 % 71.4 % 65.2 % Professional services 27.3 28.6 34.8 Total revenue 100.0 100.0 100.0 Cost of revenue Subscriptions 7.7 7.4 6.8 Professional services 20.8 20.8 22.3 Total cost of revenue 28.5 28.2 29.1 Gross profit 71.5 71.8 70.9 Operating expenses Sales and marketing 47.1 45.5 42.8 Research and development 29.7 26.4 23.1 General and administrative 25.7 22.7 17.5 Total operating expenses 102.5 94.6 83.4 Operating loss (31.0) (22.8) (12.5) Other non-operating expense (income) Other expense (income), net 0.8 1.0 (1.9) Interest expense 0.4 0.1 0.2 Total other non-operating expense (income) 1.2 1.1 (1.7) Loss before income taxes (32.2) (23.9) (10.8) Income tax expense 0.1 0.2 0.3 Net loss (32.3) % (24.1) % (11.1) % Year Ended December 31, 2022 Compared to the Year Ended December 31, 2021 Revenue 47 Year Ended December 31, 2022 2021 $ Change % Change (dollars in thousands) Revenue: Subscriptions $ 340,152 $ 263,738 $ 76,414 29.0% Professional services 127,839 105,521 22,318 21.2% Total revenue $ 467,991 $ 369,259 $ 98,732 26.7% Total revenue increased $98.7 million, or 26.7%, in 2022 compared to 2021 due to an increase in our subscriptions revenue of $76.4 million and an increase in our professional services revenue of $22.3 million.
Interest Expense Interest expense consists primarily of interest on our debt, amortization of deferred financing fees, unused credit facility fees, and commitment fees on our letters of credit. 51 Results of Operations The following table sets forth our consolidated statements of operations (in thousands): Year Ended December 31, 2023 2022 2021 Revenue Subscriptions $ 412,337 $ 340,152 $ 263,738 Professional services 133,026 127,839 105,521 Total revenue 545,363 467,991 369,259 Cost of revenue Subscriptions (1) 43,563 36,005 27,330 Professional services (1) 99,759 97,301 76,763 Total cost of revenue 143,322 133,306 104,093 Gross profit 402,041 334,685 265,166 Operating expenses Sales and marketing (1) 242,381 220,374 167,852 Research and development (1) 153,098 139,210 97,517 General and administrative (1) 114,535 120,111 83,704 Total operating expenses 510,014 479,695 349,073 Operating loss (107,973) (145,010) (83,907) Other non-operating expense Other (income) expense, net (17,603) 3,545 3,584 Interest expense 17,862 1,673 372 Total other non-operating expense 259 5,218 3,956 Loss before income taxes (108,232) (150,228) (87,863) Income tax expense 3,209 692 778 Net loss $ (111,441) $ (150,920) $ (88,641) (1) Stock-based compensation as a component of these line items is as follows: Year Ended December 31, 2023 2022 2021 (in thousands) Cost of revenue Subscriptions $ 925 $ 996 $ 1,199 Professional services 6,055 5,309 3,131 Operating expenses Sales and marketing 10,842 9,152 5,426 Research and development 12,486 12,523 5,224 General and administrative 13,079 10,850 8,864 Total stock-based compensation expense $ 43,387 $ 38,830 $ 23,844 52 The following table sets forth our consolidated statements of operations data expressed as a percentage of total revenue: Year Ended December 31, 2023 2022 2021 Revenue Subscriptions 75.6 % 72.7 % 71.4 % Professional services 24.4 27.3 28.6 Total revenue 100.0 100.0 100.0 Cost of revenue Subscriptions 8.0 7.7 7.4 Professional services 18.3 20.8 20.8 Total cost of revenue 26.3 28.5 28.2 Gross profit 73.7 71.5 71.8 Operating expenses Sales and marketing 44.4 47.1 45.5 Research and development 28.1 29.7 26.4 General and administrative 21.0 25.7 22.7 Total operating expenses 93.5 102.5 94.6 Operating loss (19.8) (31.0) (22.8) Other non-operating expense Other (income) expense, net (3.2) 0.8 1.0 Interest expense 3.3 0.4 0.1 Total other non-operating expense 0.1 1.2 1.1 Loss before income taxes (19.9) (32.2) (23.9) Income tax expense 0.6 0.1 0.2 Net loss (20.5) % (32.3) % (24.1) % Year Ended December 31, 2023 Compared to the Year Ended December 31, 2022 Revenue Year Ended December 31, 2023 2022 $ Change % Change (dollars in thousands) Revenue: Subscriptions $ 412,337 $ 340,152 $ 72,185 21.2% Professional services 133,026 127,839 5,187 4.1% Total revenue $ 545,363 $ 467,991 $ 77,372 16.5% Total revenue increased $77.4 million, or 16.5%, in 2023 compared to 2022 due to an increase in our subscriptions revenue of $72.2 million and an increase in our professional services revenue of $5.2 million.
We have experienced strong revenue growth, with revenue of $468.0 million, $369.3 million, and $304.6 million in 2022, 2021, and 2020, respectively. Our subscriptions revenue was $340.2 million, $263.7 million, and $198.7 million in 2022, 2021, and 2020, respectively, and includes sales of our cloud subscriptions, on-premises term license subscriptions, and maintenance and support.
Our subscriptions revenue was $412.3 million, $340.2 million, and $263.7 million in 2023, 2022, and 2021, respectively, and includes sales of our cloud subscriptions, on-premises term license subscriptions, and maintenance and support.
As of December 31, 2022, we operated in 15 countries. We believe we have a significant opportunity to continue to grow our international footprint. We are investing in new geographies, including through investment in direct and indirect sales channels, professional services, and customer support and implementation partners.
We believe we have a significant opportunity to continue to grow our international footprint, and we are investing in new geographies, including through investment in direct and indirect sales channels, professional services, and customer support and implementation partners. We have experienced strong revenue growth, with revenue of $545.4 million, $468.0 million, and $369.3 million in 2023, 2022, and 2021, respectively.
Adjusted EBITDA is not intended to purport to be an alternate to net loss as a measure of operating performance or to cash flows from operating activities as a measure of liquidity.
Users should consider the limitations of using adjusted EBITDA, including the fact this measure does not provide a complete measure of our operating performance. Adjusted EBITDA is not intended to purport to be an alternative to net loss as a measure of operating performance or to cash flows from operating activities as a measure of liquidity.
No single end-customer accounted for more than 10% of our total revenue in 2022, 2021, and 2020. We offer our platform globally. Our platform supports multiple languages to facilitate collaboration and address challenges in multinational organizations. In 2022, 2021, and 2020, 33.5%, 34.0%, and 33.8%, respectively, of our total revenue was generated from customers outside of the United States.
Revenue from government agencies represented 21.3%, 19.2%, and 19.6% of our total revenue in 2023, 2022, and 2021, respectively. No single end-customer accounted for more than 10% of our total revenue in 2023, 2022, and 2021. We offer our platform globally. Our platform supports multiple languages to facilitate collaboration and address challenges in multinational organizations.
Personnel costs increased due to an increase in professional services and product support personnel headcount of 14.0% from December 31, 2021 to December 31, 2022 in addition to increased wages and fringe benefits, coupled with a $2.0 million increase in stock-based compensation.
Personnel costs increased due to an increase in professional services and product support personnel headcount of 3.4% from December 31, 2022 to December 31, 2023 in addition to increased wages, coupled with a $0.7 million increase in stock-based compensation. The increase in overhead costs was driven by higher costs associated with employee medical benefits and information technology expenses.
In 2023, we expect general and administrative expense to decrease in absolute dollars largely due to an anticipated decline in legal costs. 45 Other Non-Operating Expense (Income) Other Expense (Income), Net Other expense (income), net, consists primarily of unrealized and realized gains and losses related to changes in foreign currency exchange rates, interest income on our cash and cash equivalents and investments, gains or losses on the disposal of property and equipment, and other sources of income or expense not related to our core business operations.
Other Non-Operating Expense Other Expense (Income), Net Other (income) expense, net, consists primarily of gains and losses related to changes in foreign currency exchange rates, interest income on our cash and cash equivalents and investments, and other sources of income or expense not related to our core business operations.
Interest Expense Year Ended December 31, 2022 2021 $ Change % Change (dollars in thousands) Interest expense $ 1,673 $ 372 $ 1,301 *** % of revenue 0.4 % 0.1 % *** - Indicates a percentage change that is not meaningful Interest expense increased $1.3 million in 2022 compared to the same period in 2021, primarily due to interest expense on the new term loan facility we entered into during the fourth quarter of 2022.
These increases were partially offset by a $1.2 million decrease in other income attributable to a payment received in 2022 from a local government as a result of achieving certain economic development criteria. 55 Interest Expense Year Ended December 31, 2023 2022 $ Change % Change (dollars in thousands) Interest expense $ 17,862 $ 1,673 $ 16,189 *** % of revenue 3.3 % 0.4 % *** - Indicates a percentage change that is not meaningful Interest expense increased $16.2 million in 2023 compared to the same period in 2022, primarily due to interest expense on the new term loan facility we entered into during the fourth quarter of 2022.
Sales and Marketing Expense 48 Year Ended December 31, 2022 2021 $ Change % Change (dollars in thousands) Sales and marketing $ 220,374 $ 167,852 $ 52,522 31.3% % of revenue 47.1 % 45.5 % Sales and marketing expense increased $52.5 million, or 31.3%, in 2022 compared to 2021, primarily due to a $33.3 million increase in sales and marketing personnel costs, a $13.7 million increase in overhead costs, and a $7.2 million increase in marketing costs.
Sales and Marketing Expense Year Ended December 31, 2023 2022 $ Change % Change (dollars in thousands) Sales and marketing $ 242,381 $ 220,374 $ 22,007 10.0% % of revenue 44.4 % 47.1 % Sales and marketing expense increased $22.0 million, or 10.0%, in 2023 compared to 2022, primarily due to a $25.1 million increase in sales and marketing personnel costs and a $1.0 million increase in overhead costs.
Consulting services and training services - The SSP of consulting services and training services is established based on the observable pricing of standalone sales within each geographic region where the services are sold.
Consulting services and training services - The SSP of consulting services and training services is established based on the observable pricing of standalone sales within each geographic region where the services are sold. Recent Accounting Pronouncements See Note 2 of our consolidated financial statements for information related to recently issued accounting standards.
General and Administrative Expense Year Ended December 31, 2022 2021 $ Change % Change (dollars in thousands) General and administrative expense $ 120,111 $ 83,704 $ 36,407 43.5% % of revenue 25.7 % 22.7 % General and administrative expense increased $36.4 million, or 43.5%, in 2022 compared to 2021, primarily due to a $15.4 million increase in general and administrative personnel costs, a $10.9 million increase in professional fees, and a $10.1 million increase in overhead costs.
General and Administrative Expense Year Ended December 31, 2023 2022 $ Change % Change (dollars in thousands) General and administrative expense $ 114,535 $ 120,111 $ (5,576) (4.6)% % of revenue 21.0 % 25.7 % General and administrative expense decreased $5.6 million, or 4.6%, in 2023 compared to 2022, primarily due to a $21.1 million decrease in professional fees.
These increases were partially offset by a $1.7 million decrease in professional fees.
These increases were partially offset by a $3.6 million decrease in marketing costs.
We also discuss adjusted EBITDA, a non-GAAP financial performance measure we believes offers a useful view of the overall operation of its businesses. We define adjusted EBITDA as net loss before (1) other expenses, net, (2) interest expense, (3) income tax expense, (4) depreciation and amortization, (5) stock-based compensation expense, and (6) litigation expenses directly associated with the Pegasystems cases.
We define adjusted EBITDA as net loss before (1) other non-operating (income) expenses, net, (2) interest expense, (3) income tax expense, (4) depreciation expense and amortization of intangible assets, (5) stock-based compensation expense, (6) Litigation Expense, (7) JPI Amortization, and (8) Severance Costs. The most directly comparable GAAP financial measure to adjusted EBITDA is net loss.
The increase in net cash provided by financing activities was primarily due to $120.0 million in proceeds received from the new term loan facility and a $22.6 million increase in proceeds received from the exercise of stock options primarily resulting from the vesting of the 2019 CEO stock options during 2022.
The decrease in net cash provided by financing activities was primarily due to a $28.0 million decrease in proceeds from borrowings and a $24.7 million decrease in proceeds received from the exercise of stock options.
As a result of these factors, the proportion of total revenue for a customer associated with professional services is relatively high during the initial deployment period. Over time, as the need for professional services associated with user deployments decreases and the number of end users increases, we expect subscriptions revenue as a percentage of total revenue to increase.
Over time, as the need for professional services associated with user deployments decreases and the number of end users increases, we expect subscriptions revenue as a percentage of total revenue to increase. In addition, we continue to grow our base of strategic partners to provide broader customer coverage and solution delivery capabilities.
Personnel costs increased due to an increase in general and administrative personnel headcount of 41.1% from December 31, 2021 to December 31, 2022 in addition to increased wages and fringe benefits, coupled with a $2.0 million increase in stock compensation expense. Professional fees increased due largely to higher legal and consulting fees.
Although there was a decrease in general and administrative personnel headcount of 11.4% from December 31, 2022 to December 31, 2023, personnel costs increased due to increased wages, a $2.2 million increase in stock compensation expense, and a $0.4 million increase in severance expense.
The change in net cash provided by investing activities was primarily impacted by a $23.4 million increase in purchases of investments , a $3.0 million increase in capital expenditures stemming from spending on the expansion of our headquarters, and a $36.0 million decrease in proceeds from the sale of investments.
The increase in net cash provided by investing activities was primarily impacted by an $11.8 million decrease in purchases of investments and a $7.0 million increase in proceeds from the maturities of investments, both of which were partially offset by a $0.5 million increase in capital expenditures.
We intend to further grow our base of strategic partners to provide broader customer coverage and solution delivery capabilities. In addition, over time we expect our professional services revenue as a percentage of total revenue to decline as we increasingly rely on strategic partners to help our customers deploy our software.
In addition, over time we expect our professional services revenue as a percentage of total revenue to decline as we increasingly rely on strategic partners to help our customers deploy our software. We believe our investment in professional services, including strategic partners building their practices around Appian, will drive increased adoption of our platform.
We have made, and plan to continue to make, investments for long-term growth, including investing in our platform and infrastructure to continuously maximize their power and speed, meet the evolving needs of our customers, and take advantage of our market opportunity. In addition, we continue to pursue strategic acquisitions that enhance our product offerings.
In 2023, 2022, and 2021, 75.6%, 72.7%, and 71.4% of our revenue, respectively, was derived from sales of subscriptions, while the remaining 24.4%, 27.3%, and 28.6%, respectively, was derived from the sale of professional services. • Investments in Growth - We have made, and plan to continue to make, investments for long-term growth, including investing in our platform and infrastructure to continuously maximize their power and speed, meet the evolving needs of our customers, and take advantage of our market opportunity.
Professional services gross margin decreased to 23.9% in 2022 compared to 27.3% in 2021 due to higher personnel and allocated resources costs in 2022. These cost increases were partially offset by higher professional services revenue.
Professional services gross margin increased to 25.0% in 2023 as compared to 23.9% in 2022 due to higher professional services revenue, which was partially offset by higher personnel costs in 2023.