Biggest changeYear Ended December 31, (in thousands) 2023 2022 2021 Revenue $ 218,309 $ 212,765 $ 192,197 Costs and expenses (1) : Cost of revenue 41,613 38,981 28,813 Research and development 149,998 127,073 97,096 Sales and marketing 122,925 123,182 106,430 General and administrative 76,057 67,733 54,664 Total costs and expenses 390,593 356,969 287,003 Loss from operations (172,284) (144,204) (94,806) Interest income 25,780 9,304 177 Other income (expense), net (505) (1,343) (539) Loss before income taxes (147,009) (136,243) (95,168) Provision for income taxes 756 1,673 157 Net loss $ (147,765) $ (137,916) $ (95,325) __________________ (1) Includes stock-based compensation expense as follows: Year Ended December 31, (in thousands) 2023 2022 2021 Cost of revenue $ 3,201 $ 2,627 $ 1,466 Research and development 43,619 35,567 20,690 Sales and marketing 12,548 10,160 6,388 General and administrative 23,657 16,066 18,970 Total $ 83,025 $ 64,420 $ 47,514 51 Table of Contents The following table sets forth the components of our consolidated statements of operations as a percentage of revenue for each of the periods presented: Year Ended December 31, (as a percentage of total revenue) 2023 2022 2021 Revenue 100 % 100 % 100 % Costs and expenses: Cost of revenue 19 18 15 Research and development 69 60 51 Sales and marketing 56 58 55 General and administrative 35 32 28 Total costs and expenses 179 168 149 Loss from operations (79) (68) (49) Interest income 12 4 — Other income (expense), net — (1) — Loss before income taxes (67) (64) (50) Provision for income taxes — 1 — Net loss (68) % (65) % (50) % Note: Certain figures may not sum due to rounding.
Biggest changeYear Ended December 31, (in thousands) 2024 2023 2022 Revenue $ 247,276 $ 218,309 $ 212,765 Costs and expenses (1) : Cost of revenue 41,850 41,613 38,981 Research and development 127,939 149,998 127,073 Sales and marketing 106,977 122,925 123,182 General and administrative 92,149 76,057 67,733 Total costs and expenses 368,915 390,593 356,969 Loss from operations (121,639) (172,284) (144,204) Interest income 24,381 25,780 9,304 Other income (expense), net (99) (505) (1,343) Loss before income taxes (97,357) (147,009) (136,243) Provision for income taxes 706 756 1,673 Net loss $ (98,063) $ (147,765) $ (137,916) __________________ (1) Includes stock-based compensation expense as follows: Year Ended December 31, (in thousands) 2024 2023 2022 Cost of revenue $ 2,736 $ 3,201 $ 2,627 Research and development 39,037 43,619 35,567 Sales and marketing 9,671 12,548 10,160 General and administrative 22,611 23,657 16,066 Total $ 74,055 $ 83,025 $ 64,420 51 Table of Contents The following table sets forth the components of our consolidated statements of operations as a percentage of revenue for each of the periods presented: Year Ended December 31, (as a percentage of total revenue) 2024 2023 2022 Revenue 100 % 100 % 100 % Costs and expenses: Cost of revenue 17 19 18 Research and development 52 69 60 Sales and marketing 43 56 58 General and administrative 37 35 32 Total costs and expenses 149 179 168 Loss from operations (49) (79) (68) Interest income 10 12 4 Other income (expense), net — — (1) Loss before income taxes (39) (67) (64) Provision for income taxes — — 1 Net loss (40) % (68) % (65) % Note: Certain figures may not sum due to rounding.
Financing activities Cash provided by financing activities for the year ended December 31, 2023 was $8.9 million, which consisted of $7.2 million of proceeds from the exercise of stock options and $2.0 million of proceeds from the issuance of common stock under the employee stock purchase plan.
Cash provided by financing activities for the year ended December 31, 2023 was $8.9 million, which consisted of $7.2 million of proceeds from the exercise of stock options and $2.0 million of proceeds from the issuance of common stock under the employee stock purchase plan.
The following table summarizes the restructuring charges in the consolidated statements of operations for the year ended December 31, 2023 (in thousands): Severance and Related Charges Stock-Based Compensation Expense Total Research and development $ 5,141 $ 903 $ 6,044 Sales and marketing 2,984 228 3,212 General and administrative 1,763 80 1,843 Total $ 9,888 $ 1,211 $ 11,099 Refer to Note 14 to our consolidated financial statements for further information on our restructuring charges.
The following table summarizes the restructuring charges in the consolidated statements of operations for the year ended December 31, 2023 (in thousands): Severance and Related Charges Stock-Based Compensation Expense Total Research and development $ 5,141 $ 903 $ 6,044 Sales and marketing 2,984 228 3,212 General and administrative 1,763 80 1,843 Total $ 9,888 $ 1,211 $ 11,099 Refer to Note 13 to our consolidated financial statements for further information on our restructuring charges.
Periods of significant growth and changes in the macroeconomic environment have partially masked these trends in historical periods.
Periods of significant growth and changes in the macroeconomic environment have partially masked these trends in some historical periods.
A valuation allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized. Recently Issued Accounting Pronouncements Refer to Note 2 to our consolidated financial statements included elsewhere in this Annual Report for more information regarding recently issued accounting pronouncements.
A valuation allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized. 56 Table of Contents Recently Issued Accounting Pronouncements Refer to Note 2 to our consolidated financial statements included elsewhere in this Annual Report for more information regarding recently issued accounting pronouncements.
The net cash inflows from changes in operating assets and liabilities were primarily due to a $5.3 million increase in accrued expenses and other liabilities, a $4.7 million 54 Table of Contents decrease in operating lease right-of-use assets due to normal amortization, a $3.5 million decrease in accounts receivable, and a $3.4 million decrease in prepaid expenses and other assets.
The net cash inflows from changes in operating assets and liabilities were primarily due to a $5.3 million increase in accrued expenses and other liabilities, a $4.7 million decrease in operating lease right-of-use assets due to normal amortization, a $3.5 million decrease in accounts receivable, and a $3.4 million decrease in prepaid expenses and other assets.
Macroeconomic conditions, such as inflation, supply chain issues, fluctuations in foreign currency exchange rates, competition from other platforms and other risks and uncertainties have impacted, and all or some of these factors may continue to impact, advertiser demand, user growth, user engagement, and our business, operations and financial results.
Quarterly ARPU Factors Affecting Our Performance Macroeconomic Conditions. Macroeconomic conditions, such as inflation, supply chain issues, fluctuations in foreign currency exchange rates, competition from other platforms and other risks and uncertainties have impacted, and all or some of these factors may continue to impact, advertiser demand, user growth, user engagement, and our business, operations and financial results.
Discussions regarding our financial condition and results of operations for the year ended December 31, 2023 compared to the year ended December 31, 2022 are presented below.
Discussions regarding our financial condition and results of operations for the year ended December 31, 2024 compared to the year ended December 31, 2023 are presented below.
Discussions regarding our financial condition and results of operations for the year ended December 31, 2022 compared to the year ended December 31, 2021 are located in Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 28, 2023.
Discussions regarding our financial condition and results of operations for the year ended December 31, 2023 compared to the year ended December 31, 2022 are located in Part II, Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on February 27, 2024.
Restructuring In the fourth quarter of 2023, we announced a cost reduction plan (the “Cost Reduction Plan”) intended to right size the business and align the workforce and other expenses with our near term revenue expectations and long term business priorities. The Cost Reduction 45 Table of Contents Plan included a reduction of full-time employee headcount by approximately 25%.
In the fourth quarter of 2023, we announced a cost reduction plan (the “Cost Reduction Plan”) intended to right size the business and align the workforce and other expenses with our near term revenue expectations and long term business priorities. The Cost Reduction Plan included a reduction of full-time employee headcount by approximately 25%.
We currently have no debt outstanding. We have generated losses from our operations, as reflected in our accumulated deficit of $766.0 million as of December 31, 2023. We incurred operating losses and cash outflows from operations by supporting the growth of our business. We expect these losses and operating cash outflows to continue for the foreseeable future.
We currently have no debt outstanding. We have generated losses from our operations, as reflected in our accumulated deficit of $864.1 million as of December 31, 2024. We incurred operating losses and cash outflows from operations by supporting the growth of our business. We expect these losses and operating cash outflows to continue for the foreseeable future.
We also expect to incur significant research and development, sales and marketing, and general and administrative expenses over the next several years in connection with the continued development and strategic expansion of our business. As of December 31, 2023, we had $531.1 million in cash, cash equivalents, and marketable securities.
We also expect to incur significant research and development, sales and marketing, and general and administrative expenses over the next several years in connection with the continued development and strategic expansion of our business. As of December 31, 2024, we had $427.0 million in cash, cash equivalents, and marketable securities.
The introduction of these changes impacts our ability to accurately calculate a portion of WAUs for periods following the adoption of the updated operating systems. Following this introduction, we use estimates for these user engagement numbers based on historical data sets, as well as data from users who engage with Nextdoor’s monetizable content on email clients other than Apple email.
This impacts our ability to accurately calculate a portion of WAUs for periods following the adoption of the updated operating systems. To address this, we use estimates for these user engagement numbers based on historical data sets, as well as data from users who engage with Nextdoor’s monetizable email content.
Sales and marketing expenses also include brand and performance marketing for both user and local business acquisition, and neighbor services, which includes personnel-related costs for our neighbor support team, our outsourced neighbor support function, and verification costs. Performance marketing costs related to user acquisition largely consist of the distribution of mailed invitations and, to a lesser extent, digital advertising.
Sales and marketing expenses also include brand and performance marketing for both user and local business acquisition, and neighbor services, which includes personnel-related costs for our neighbor support team, our outsourced neighbor support function, and verification costs. Performance marketing costs related to local business acquisition largely consists of digital advertising and, to a lesser extent, direct mail campaigns.
Adjusted EBITDA is not presented in accordance with GAAP and the use of this term varies from others in our industry. 55 Table of Contents The following is a reconciliation of net loss, the most comparable GAAP measure, to Adjusted EBITDA: Year Ended December 31, (in thousands) 2023 2022 2021 Net loss $ (147,765) $ (137,916) $ (95,325) Depreciation and amortization 5,769 5,656 4,172 Stock-based compensation 83,025 64,420 47,514 Interest income (25,780) (9,304) (177) Provision for income taxes 756 1,673 157 Restructuring charges 9,888 — — Adjusted EBITDA $ (74,107) $ (75,471) $ (43,659) Critical Accounting Policies and Estimates We prepare our consolidated financial statements in accordance with GAAP.
Adjusted EBITDA is not presented in accordance with GAAP and the use of this term varies from others in our industry. 55 Table of Contents The following is a reconciliation of net loss, the most comparable GAAP measure, to Adjusted EBITDA: Year Ended December 31, (in thousands) 2024 2023 2022 Net loss $ (98,063) $ (147,765) $ (137,916) Depreciation and amortization 3,898 5,769 5,656 Stock-based compensation 74,055 83,025 64,420 Interest income (24,381) (25,780) (9,304) Provision for income taxes 706 756 1,673 Restructuring charges 25,578 9,888 — Adjusted EBITDA $ (18,207) $ (74,107) $ (75,471) Critical Accounting Policies and Estimates We prepare our consolidated financial statements in accordance with GAAP.
The increase was primarily due to a $1.3 million increase in third-party hosting costs due to rising user growth and engagement, a $0.9 million increase in allocated personnel-related costs, and a $0.4 million increase in third-party costs associated with delivering and supporting our advertising products.
The increase was primarily due to a $0.6 million increase in third-party hosting costs due to rising user growth and engagement, a $0.4 million increase in advertising platform costs, and a $0.2 million increase in third-party costs associated with delivering and supporting our advertising products, partially offset by a $1.0 million decrease in allocated personnel-related costs.
The incremental borrowing rate is a hypothetical rate based on the rate of interest we would have to pay to borrow on a collateralized basis over a similar term and amount equal to the lease payments in a similar economic environment.
The incremental borrowing rate is a hypothetical rate based on the rate of interest we would have to pay to borrow on a collateralized basis over a similar term and amount equal to the lease payments in a similar economic environment. Income Taxes We are subject to income taxes in the United States and numerous foreign jurisdictions.
The decrease was primarily due to a $14.7 million decrease in performance marketing costs for user acquisition as focus shifted to organic user acquisition channels and a $0.9 million decrease in performance marketing costs to attract local businesses, offset by a $15.3 million increase in personnel-related and other costs, inclusive of restructuring costs, which was driven by an increase in average headcount.
The decrease was primarily due to a $15.7 million decrease in personnel-related and other costs, inclusive of restructuring costs, which was driven by a decrease in average headcount, a $1.1 million decrease in neighbor services, and a $0.3 million decrease in performance marketing costs to attract local businesses, partially offset by a $1.1 million increase in performance marketing costs for user acquisition.
In addition, allocated overhead costs, such as facilities, information technology, and depreciation are included in research and development expenses. 49 Table of Contents Sales and Marketing Sales and marketing expenses consist of personnel-related and other costs which include salaries, commissions, benefits, restructuring costs, and stock-based compensation for employees engaged in sales and marketing activities as well as other costs including third-party consulting, public relations, allocated overhead costs, and amortization of acquired intangible assets.
Sales and Marketing Sales and marketing expenses consist of personnel-related and other costs which include salaries, commissions, benefits, restructuring costs, and stock-based compensation for employees engaged in sales and marketing activities as well as other costs including third-party consulting, public relations, allocated overhead costs, and amortization of acquired intangible assets.
Investing activities Cash provided by investing activities for the year ended December 31, 2023 was $66.5 million, which consisted of proceeds from maturities of marketable securities of $504.4 million and proceeds from sales of marketable securities of $155.4 million.
Investing activities Cash provided by investing activities for the year ended December 31, 2024 was $86.4 million, which consisted of proceeds from maturities of marketable securities of $198.5 million and proceeds from sales of marketable securities of $185.6 million.
Provision for income taxes Year Ended December 31, Change (in thousands) 2023 2022 $ % Provision for income taxes $ 756 $ 1,673 $ (917) (55) % Provision for income taxes decreased by $0.9 million, or 55%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
Provision for income taxes Year Ended December 31, Change (in thousands) 2024 2023 $ % Provision for income taxes $ 706 $ 756 $ (50) (7) % Provision for income taxes decreased by $0.1 million, or 7%, for the year ended December 31, 2024 compared to the year ended December 31, 2023.
The decrease was primarily due to the periodic re-measurement of monetary assets and liabilities denominated in non-functional currencies.
The decrease was primarily due to the periodic re-measurement of monetary assets and liabilities denominated in non-functional currencies and gains and losses on marketable securities and foreign currency transactions.
Key business metrics for the three months ended December 31, 2023 are as follows: • Weekly active users (“WAUs”) were 41.8 million, an increase of 5% compared to the three months ended December 31, 2022. • Average revenue per weekly active user (“ARPU”) was $1.33 and remained flat compared to the three months ended December 31, 2022.
Key business metrics for the three months ended December 31, 2024 are as follows: • Weekly active users (“WAUs”) were 45.9 million, an increase of 10% compared to the three months ended December 31, 2023. • Average revenue per weekly active user (“ARPU”) was $1.42, an increase of 7% compared to the three months ended December 31, 2023.
Financial Results as of and for the year ended December 31, 2023 are as follows: • Revenue was $218.3 million, an increase of 3% compared to 2022. • Total costs and expenses were $390.6 million, an increase of 9% compared to 2022, including $11.1 million of restructuring charges. • Net loss increased 7% to $147.8 million in 2023, compared to $137.9 million in 2022. • Adjusted EBITDA loss decreased 2% to $74.1 million in 2023, compared to $75.5 million in 2022. • Cash, cash equivalents, and marketable securities were $531.1 million.
Financial Results as of and for the year ended December 31, 2024 are as follows: • Revenue was $247.3 million, an increase of 13% compared to 2023. • Total costs and expenses were $368.9 million, a decrease of 6% compared to 2023, including $25.6 million of restructuring charges. • Net loss decreased 34% to $98.1 million in 2024, compared to $147.8 million in 2023. • Adjusted EBITDA loss decreased 75% to $18.2 million in 2024, compared to $74.1 million in 2023. • Cash, cash equivalents, and marketable securities were $427.0 million.
Cost of revenue Year Ended December 31, Change (in thousands, except percentages) 2023 2022 $ % Cost of revenue $ 41,613 $ 38,981 $ 2,632 7 % Cost of revenue increased by $2.6 million, or 7%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
Cost of revenue Year Ended December 31, Change (in thousands, except percentages) 2024 2023 $ % Cost of revenue $ 41,850 $ 41,613 $ 237 1 % Cost of revenue increased by $0.2 million, or 1%, for the year ended December 31, 2024 compared to the year ended December 31, 2023.
Other income (expense), net Year Ended December 31, Change (in thousands, except percentages) 2023 2022 $ % Other income (expense), net $ (505) $ (1,343) $ 838 (62) % Other expense, net decreased by $0.8 million, or 62%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
Other income (expense), net Year Ended December 31, Change (in thousands, except percentages) 2024 2023 $ % Other income (expense), net $ (99) $ (505) $ 406 (80) % Other expense, net decreased by $0.4 million, or 80%, for the year ended December 31, 2024 compared to the year ended December 31, 2023.
Cash used in operating activities during the year ended December 31, 2022 was $60.5 million which resulted from a net loss of $137.9 million, adjusted for non-cash charges of $68.0 million and net cash inflows of $9.4 million from changes in operating assets and liabilities.
Cash used in operating activities during the year ended December 31, 2023 was $59.3 million which resulted from a net loss of $147.8 million, adjusted for non-cash charges of $79.9 million and net cash inflows of $8.6 million from changes in operating assets and liabilities.
Cash Flows The following table summarizes our cash flows for the periods presented: Year Ended December 31, (in thousands) 2023 2022 2021 Net cash used in operating activities $ (59,273) $ (60,503) $ (51,268) Net cash provided by (used in) investing activities $ 66,490 $ (342,448) $ (149,522) Net cash provided by (used in) financing activities $ 8,916 $ (64,348) $ 637,576 Operating activities Cash used in operating activities during the year ended December 31, 2023 was $59.3 million which resulted from a net loss of $147.8 million, adjusted for non-cash charges of $79.9 million and net cash inflows of $8.6 million from changes in operating assets and liabilities.
Cash Flows The following table summarizes our cash flows for the periods presented: Year Ended December 31, (in thousands) 2024 2023 2022 Net cash used in operating activities $ (20,202) $ (59,273) $ (60,503) Net cash provided by (used in) investing activities $ 86,426 $ 66,490 $ (342,448) Net cash provided by (used in) financing activities $ (81,035) $ 8,916 $ (64,348) Operating activities Cash used in operating activities during the year ended December 31, 2024 was $20.2 million which resulted from a net loss of $98.1 million, adjusted for non-cash charges of $95.9 million and net cash outflows of $18.0 million from changes in operating assets and liabilities.
Research and development Year Ended December 31, Change (in thousands, except percentages) 2023 2022 $ % Research and development $ 149,998 $ 127,073 $ 22,925 18 % Research and development expenses increased by $22.9 million, or 18%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
Research and development Year Ended December 31, Change (in thousands, except percentages) 2024 2023 $ % Research and development $ 127,939 $ 149,998 $ (22,059) (15) % Research and development expenses decreased by $22.1 million, or 15%, for the year ended December 31, 2024 compared to the year ended December 31, 2023.
The increase was primarily due to a $20.2 million increase in personnel-related costs, inclusive of restructuring costs, primarily driven by an increase in average headcount, a $2.4 million increase in third-party software costs, and a $0.5 million increase in allocated overhead costs reflecting an increase in average headcount. 52 Table of Contents Sales and marketing Year Ended December 31, Change (in thousands, except percentages) 2023 2022 $ % Personnel-related and other $ 93,056 $ 77,718 $ 15,338 20 % Brand and performance marketing 18,054 33,628 (15,574) (46) % Neighbor services 11,815 11,836 (21) — % Total sales and marketing $ 122,925 $ 123,182 $ (257) — % Sales and marketing expenses decreased by $0.3 million for the year ended December 31, 2023 compared to the year ended December 31, 2022.
The decrease was primarily due to a $21.3 million decrease in personnel-related costs, inclusive of restructuring costs, primarily driven by a decrease in average headcount, and a $0.4 million decrease in allocated overhead costs reflecting a decrease in average headcount, partially offset by a $0.6 million increase in third-party software costs. 52 Table of Contents Sales and marketing Year Ended December 31, Change (in thousands, except percentages) 2024 2023 $ % Personnel-related and other $ 77,350 $ 93,056 $ (15,706) (17) % Brand and performance marketing 18,876 18,054 822 5 % Neighbor services 10,751 11,815 (1,064) (9) % Total sales and marketing $ 106,977 $ 122,925 $ (15,948) (13) % Sales and marketing expenses decreased by $15.9 million for the year ended December 31, 2024 compared to the year ended December 31, 2023.
Comparison of the Years Ended December 31, 2023 and 2022 Revenue Year Ended December 31, Change (in thousands, except percentages) 2023 2022 $ % Revenue $ 218,309 $ 212,765 $ 5,544 3 % Revenue increased by $5.5 million, or 3%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
Comparison of the Years Ended December 31, 2024 and 2023 Revenue Year Ended December 31, Change (in thousands, except percentages) 2024 2023 $ % Revenue $ 247,276 $ 218,309 $ 28,967 13 % Revenue increased by $29.0 million, or 13%, for the year ended December 31, 2024 compared to the year ended December 31, 2023.
General and administrative Year Ended December 31, Change (in thousands, except percentages) 2023 2022 $ % General and administrative $ 76,057 $ 67,733 $ 8,324 12 % General and administrative expenses increased by $8.3 million, or 12%, for the year ended December 31, 2023 compared to the year ended December 31, 2022.
General and administrative Year Ended December 31, Change (in thousands, except percentages) 2024 2023 $ % General and administrative $ 92,149 $ 76,057 $ 16,092 21 % General and administrative expenses increased by $16.1 million, or 21%, for the year ended December 31, 2024 compared to the year ended December 31, 2023.
As the size and engagement of our user base grows, we believe the potential to increase our revenue grows. 48 Table of Contents We may face challenges increasing the size and engagement of our user base due to a number of factors including competition, challenges in acquiring and engaging users, or changes in regulations. Growth in Monetization .
We may face challenges increasing the size and engagement of our user base due to a number of factors including competition, challenges in acquiring and engaging users, or changes in regulations. Growth in Monetization . Monetization trends, which are reflected in our ARPU, are a key factor that affects our revenue and financial results.
The net cash inflows from changes in operating assets and liabilities were primarily due to a $7.7 million increase in accrued expenses and other liabilities, a $6.9 million decrease in operating lease right-of-use assets due to normal amortization, and a $3.8 million decrease in prepaid expenses and other assets.
The net cash outflows from changes in operating assets and liabilities were primarily due to a $8.1 million decrease in accrued expenses and other liabilities, a $6.9 million decrease in operating lease liabilities due to lease payments, a $5.1 million increase in accounts receivable, and a $1.6 million decrease in accounts payable.
See "Risk Factors" and "Special Note Regarding Forward-Looking Statements” for additional details. Growth in and Engagement of Users. We measure growth in, and engagement of, users by tracking WAUs.
See "Risk Factors" and "Special Note Regarding Forward-Looking Statements” for additional details. 48 Table of Contents Growth in and Engagement of Users. We measure growth in, and engagement of, users by tracking WAUs. As the size and engagement of our user base grows, we believe the potential to increase our revenue grows.
We also present WAUs by geography because we are more advanced in engagement and monetization in the United States than internationally. Beginning in September 2021, Apple introduced changes to the Apple email client available on its operating systems, which limit our ability to measure user engagement with emails containing monetizable content for users that use the Apple email client.
We also present WAUs by geography because we are more advanced in engagement and monetization in the United States than internationally. In recent years, changes made to third party email operating systems have limited our ability to measure user engagement with emails containing monetizable content.
If our near-term investments do not lead to increased international WAUs and ARPU and expected revenue growth over time, we may not achieve or, if achieved, maintain profitability and our growth rates may slow or decline. Seasonality. Industry advertising spend tends to be strongest in the fourth quarter, and we typically observe a similar pattern in our historical revenue.
If these efforts do not lead to increased international WAUs and ARPU and expected revenue growth over time, we may not achieve or, if achieved, maintain profitability and our growth rates may slow or decline. Seasonality. We typically observe seasonal improvements in advertising spend beginning in the second quarter, with those demand trends remaining stable through the fourth quarter.
Research and Development Research and development expenses consist primarily of personnel-related costs, including salaries, benefits, restructuring costs, and stock-based compensation for our employees engaged in research and development, as well as costs for consultants, contractors and third-party software.
Cost of revenue also includes third-party costs associated with delivering and supporting our advertising products and credit card transaction fees related to processing customer transactions. 49 Table of Contents Research and Development Research and development expenses consist primarily of personnel-related costs, including salaries, benefits, restructuring costs, and stock-based compensation for our employees engaged in research and development, as well as costs for consultants, contractors and third-party software.
We define ARPU as our total revenue in that geography during a period divided by the average of the number of WAUs in that geography during the same period. We present ARPU on a U.S. and international basis because we are more advanced in our monetization in the United States than internationally. U.S.
We present ARPU on a U.S. and international basis because we are more advanced in our monetization in the United States than internationally. 47 Table of Contents U.S.
We are also focused on increasing our user base and engagement in the United States and internationally, which will increase the opportunities for businesses to advertise on Nextdoor.
To increase monetization, we are focused on serving more national brands by efficiently scaling our sales force, increasing ad agency relationships, and enhancing our self-serve tools for customers of all sizes. We are also focused on increasing our user base and engagement in the United States and internationally, which will increase the opportunities for businesses to advertise on Nextdoor.
Performance marketing costs related to local business acquisition largely consists of digital advertising and, to a lesser extent, direct mail campaigns.
Performance marketing costs related to user acquisition largely consist of digital advertising and, to a lesser extent, the distribution of mailed invitations.
Cash used in financing activities for the year ended December 31, 2022 was $64.3 million, which consisted of repurchases of common stock of $77.2 million. This was partially offset by $12.5 million of proceeds from the exercise of stock options.
Financing activities Cash used in financing activities for the year ended December 31, 2024 was $81.0 million, which consisted of repurchases of common stock of $75.5 million and $19.9 million of tax withholdings from stock-based awards, partially offset by $13.3 million of proceeds from the exercise of stock options and $1.1 million of proceeds from the issuance of common stock under the employee stock purchase plan.
The increase was primarily due to a $10.5 million increase in personnel-related costs, inclusive of restructuring costs, which was driven by an increase in average headcount, partially offset by a $2.7 million decrease in insurance expenses.
The increase was primarily due to $22.8 million of impairment costs related to office space reductions, partially offset by a $4.0 million decrease in personnel-related costs, inclusive of restructuring costs, which was driven by a decrease in average headcount, and a $1.9 million decrease in professional fees.
Interest income Year Ended December 31, Change (in thousands, except percentages) 2023 2022 $ % Interest income $ 25,780 $ 9,304 $ 16,476 177 % Interest income increased by $16.5 million, or 177%, for the year ended December 31, 2023 compared to the year ended December 31, 2022. The increase was driven by higher interest rates.
Interest income Year Ended December 31, Change (in thousands, except percentages) 2024 2023 $ % Interest income $ 24,381 $ 25,780 $ (1,399) (5) % Interest income decreased by $1.4 million, or 5%, for the year ended December 31, 2024 compared to the year ended December 31, 2023. The decrease was primarily driven by lower invested balances.
For purposes of calculating ARPU, revenue by user geography is apportioned to each region based on a determination of the location of the account where the revenue-generating 47 Table of Contents activities occur.
For purposes of calculating ARPU, revenue by user geography is apportioned to each region based on a determination of the location of the account where the revenue-generating activities occur. Our ARPU for the years ended December 31, 2024 and 2023 was $5.48 and $5.25, respectively, with the increase due to stronger revenue growth relative to WAU growth.
The increase was primarily due to an increase in advertiser demand for our product offerings, which we believe was driven by increased marketer spending as well as increased user engagement as measured by a 9% increase in 2023 WAUs. Full year ARPU decreased 6% reflecting stronger year-over-year WAU growth relative to revenue growth.
The increase was primarily due to increased advertiser spending as well as increased user engagement as measured by an 8% increase in 2024 WAUs. Full year ARPU increased 4% reflecting year-over-year growth in both revenue and WAUs.
These amounts were partially offset by a $7.1 million decrease in operating lease liabilities due to lease payments, and a $1.6 million decrease in accounts payable.
These amounts were partially offset by a $3.7 million decrease in operating lease right-of-use assets due to normal amortization.
We believe that increased international monetization presents an important opportunity for long-term growth, and we are working on localizing our product and expanding our operations to better serve our international user and customer base.
While we believe that increased international monetization presents an important opportunity for long-term growth, our primary focus remains on improving our product experience and aligning our operations to best serve users and advertisers in our existing markets.
Cash used in investing activities for the year ended December 31, 2022 was $342.4 million, which consisted of purchases of marketable securities of $711.9 million, a loan to Opportunity Finance Network of $5.0 million, and purchases of property and equipment of $3.2 million.
This was partially offset by purchases of marketable securities of $289.8 million and a loan to Opportunity Finance Network of $7.5 million. Cash provided by investing activities for the year ended December 31, 2023 was $66.5 million, which consisted of proceeds from maturities of marketable securities of $504.4 million and proceeds from sales of marketable securities of $155.4 million.
The Share Repurchase Program does not obligate us to repurchase any dollar amount or number of shares, and the program may be extended, modified, suspended, or discontinued at any time. During the year ended December 31, 2023, we did not repurchase or retire any shares of Class A common stock.
The Share Repurchase Program does not obligate us to repurchase any dollar amount or number of shares, and the program may be extended, modified, suspended, or discontinued at any time. On February 21, 2024, our Board of Directors authorized and approved an increase of $150.0 million to the Share Repurchase Program and extended the expiration date to March 31, 2026.
While we have the ability to serve ads in all emails with monetizable content, we currently only do so on a portion of the total. 46 Table of Contents Quarterly Average Weekly Active Users (in millions) Average Revenue per Weekly Active User (ARPU) We generate revenue primarily from advertising. We measure monetization of our platform through our ARPU metric.
Quarterly Average Weekly Active Users (in millions) Average Revenue per Weekly Active User (ARPU) We generate revenue primarily from advertising. We measure monetization of our platform through our ARPU metric. We define ARPU as our total revenue in that geography during a period divided by the average of the number of WAUs in that geography during the same period.
Our ability to grow our user base, attract new advertisers, increase our revenue, and expand our total addressable market will depend, in part, on our ability to continue innovating. International Expansion. Our early proof points from launches in certain countries outside of the United States show user engagement across international markets on par with the U.S. market.
Our ability to grow our user base, attract new advertisers, increase our revenue, and expand our total addressable market will depend, in part, on our ability to continue innovating. Investments in Platform . In 2024, we announced the launch of our NEXT initiative, a planned transformation of our platform.
Our WAU for the three months ended December 31, 2023 and 2022 was 41.8 million and 40.0 million, respectively, which represents 5% growth period over period. 1 Emails with monetizable content are emails with a primary purpose to regularly inform users about topics that are relevant to them, and are therefore appropriate for delivering ads to users.
While we have the ability to serve ads in all emails with monetizable content, we currently only do so on a portion of the total. 46 Table of Contents Our WAU for the three months ended December 31, 2024 and 2023 was 45.9 million and 41.8 million, respectively, which represents 10% growth period over period.
Non-cash charges primarily consisted of $64.4 million of stock-based compensation expense and $5.7 million of depreciation and amortization expense.
Non-cash charges primarily consisted of $74.1 million of stock-based compensation expense, $22.8 million of non-cash impairment charges related to lease abandonment, and $3.9 million of depreciation and amortization expense, partially offset by $5.5 54 Table of Contents million of accretion on investments.
We also believe that we can increase the monetization of users in international markets and that we can increase long-term ARPU for international WAUs from current levels. While we expect to grow ARPU for international WAUs, we still expect this to be lower than ARPU for U.S. WAUs. We expect that our international expansion will require significant investment.
We are taking a strategic and measured approach to international expansion, prioritizing investments in markets where we see the strongest potential for sustainable growth. Over time, we believe that international WAUs can expand meaningfully, and we see opportunities to increase monetization and ARPU in these markets. However, we expect ARPU for international WAUs to be lower than ARPU for U.S.