Biggest changeOur cost of revenue, gross profit and gross margin for the years ended December 31, 2022 and 2021 were as follows (in thousands, except percentages): Year ended December 31, Increase (decrease) from prior year 2022 2021 $ % Cost of revenue: Product $ 245,145 $ 214,745 $ 30,400 14.2 % Service 142,137 147,209 (5,072) (3.4) % Amortization of acquired technology 31,542 38,343 (6,801) (17.7) % Total cost of revenue $ 418,824 $ 400,297 $ 18,527 4.6 % Gross profit $ 400,936 $ 444,660 $ (43,724) (9.8) % Gross margin 48.9 % 52.6 % Our segment cost of revenue, gross profit and gross margin for the years ended December 31, 2022 and 2021 were as follows (in thousands, except percentages): Year ended December 31, 2022 Year ended December 31, 2021 Cloud and Edge IP Optical Networks Total Cloud and Edge IP Optical Networks Total Product $ 80,570 $ 164,575 $ 245,145 $ 79,811 $ 134,934 $ 214,745 Service 98,799 43,338 142,137 107,677 39,532 147,209 Amortization of acquired technology 18,471 13,071 31,542 25,704 12,639 38,343 Total cost of revenue $ 197,840 $ 220,984 $ 418,824 $ 213,192 $ 187,105 $ 400,297 Gross profit $ 310,297 $ 90,639 $ 400,936 $ 343,464 $ 101,196 $ 444,660 Gross margin 61.1 % 29.1 % 48.9 % 61.7 % 35.1 % 52.6 % Our gross margin decreased by four percentage points in 2022 compared to 2021.
Biggest changeOur cost of revenue, gross profit and gross margin for the years ended December 31, 2023 and 2022 were as follows (in thousands, except percentages): Year ended December 31, Increase (decrease) from prior year 2023 2022 $ % Cost of revenue: Product $ 250,609 $ 245,145 $ 5,464 2.2 % Service 139,357 142,137 (2,780) (2.0) % Amortization of acquired technology 28,290 31,542 (3,252) (10.3) % Total cost of revenue $ 418,256 $ 418,824 $ (568) (0.1) % Gross profit $ 408,083 $ 400,936 $ 7,147 1.8 % Gross margin 49.4 % 48.9 % Our segment cost of revenue, gross profit and gross margin for the years ended December 31, 2023 and 2022 were as follows (in thousands, except percentages): Year ended December 31, 2023 Year ended December 31, 2022 Cloud and Edge IP Optical Networks Total Cloud and Edge IP Optical Networks Total Product $ 72,081 $ 178,528 $ 250,609 $ 80,570 $ 164,575 $ 245,145 Service 92,644 46,713 139,357 98,799 43,338 142,137 Amortization of acquired technology 12,904 15,386 28,290 18,471 13,071 31,542 Total cost of revenue $ 177,629 $ 240,627 $ 418,256 $ 197,840 $ 220,984 $ 418,824 Gross profit $ 300,018 $ 108,065 $ 408,083 $ 310,297 $ 90,639 $ 400,936 Gross margin 62.8 % 31.0 % 49.4 % 61.1 % 29.1 % 48.9 % Our gross margin was slightly higher with a 0.5 percentage point increase in 2023 compared to 2022.
The results of our 2021 impairment test determined that the carrying value of our IP Optical Networks segment exceeded its fair value. The amount of the impairment was $116.0 million, was recorded in the fourth quarter of 2021 and is reported separately in our consolidated statement of operations for the year ended December 31, 2021.
The results of our 2021 impairment test determined that the carrying value of our IP Optical Networks segment exceeded its fair value. The amount of the impairment of $116.0 million was recorded in the fourth quarter of 2021 and is reported separately in our consolidated statement of operations for the year ended December 31, 2021.
We recorded restructuring and related expense of $10.8 million in 2022, comprised of $ 5.3 million for severance and related costs, and $ 5.5 million for variable and other facilities-related costs, including $ 1.6 million of net expense for the accelerated amortization of lease assets.
We recorded $10.8 million of restructuring and related expense in 2022, comprised of $5.3 million for severance and related costs, and $5.5 million for variable and other facilities-related costs, including $1.6 million of net expense for the accelerated amortization of lease assets.
We have no off-balance sheet arrangements that have or are reasonably likely to have a current or future material effect on our financial position, changes in financial position, revenue or expenses, results of operations, liquidity, capital expenditures or capital resources.
Off-Balance Sheet Arrangements We have no off-balance sheet arrangements that have or are reasonably likely to have a current or future material effect on our financial position, changes in financial position, revenue or expenses, results of operations, liquidity, capital expenditures or capital resources.
Our mission is to create a recognized global technology leader providing cloud-centric solutions that enable the secure exchange of information, with unparalleled scale, performance and elasticity. Headquartered in Plano, Texas, we have a global presence with research and development and/or sales and support locations in over thirty countries around the world.
Our mission is to create a recognized global technology leader providing cloud-centric solutions that enable the secure exchange of information, with unparalleled scale, performance and elasticity. We are headquartered in Plano, Texas, and have a global presence with research and development or sales and support locations in over thirty countries around the world.
The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets, liabilities, revenue and expenses, and related disclosure of contingent assets and liabilities. We base our estimates and judgments on historical experience, knowledge of current conditions and beliefs of what could occur in the future given available information.
The preparation of these financial statements requires us to make 43 estimates and judgments that affect the reported amounts of assets, liabilities, revenue and expenses, and related disclosure of contingent assets and liabilities. We base our estimates and judgments on historical experience, knowledge of current conditions and beliefs of what could occur in the future given available information.
We assess each valuation methodology based upon the relevance and availability of the data at the time the valuation is performed and the methodologies are weighted appropriately. Based upon the completion of our 2022 annual test for goodwill impairment, we determined that there was no impairment of goodwill for either of our reporting units.
We assess each valuation methodology based upon the relevance and availability of the data at the time the valuation is performed and the methodologies are weighted appropriately. Based upon the completion of our 2023 and 2022 annual test for goodwill impairment, we determined that there was no impairment of goodwill for either of our reporting units.
The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (loss) in the consolidated balance sheet and is subsequently reclassified into earnings in the period that the hedged forecasted transactions affect earnings.
The effective portion of changes in the fair value of designated derivatives that qualify as cash flow hedges is recorded in Accumulated other comprehensive income in the consolidated balance sheet and is subsequently reclassified into earnings in the period that the hedged forecasted transactions affect earnings.
Also, the Fifth Amendment reduced the 52 minimum Consolidated Fixed Charge Coverage Ratio (as defined in the 2020 Credit Facility) in 2022, with the fourth quarter of 2022 reduced to 1.10:1.00 and in all subsequent quarters the ratio will be fixed at 1.25:1.00.
Also, the Fifth Amendment reduced the minimum Consolidated Fixed Charge Coverage Ratio (as defined in the 2020 Credit Facility) in 2022, with the fourth quarter of 2022 reduced to 1.10:1.00 and in all subsequent quarters the ratio will be fixed at 1.25:1.00.
Leases with an initial term of 12 months or less are not recorded on the balance sheet and lease expense for these leases is recognized on a straight-line basis over the lease term. For operating leases, lease expense for minimum fixed lease payments is recognized on a straight-line basis over the lease 45 term.
Leases with an initial term of 12 months or less are not recorded on the balance sheet and lease expense for these leases is recognized on a straight-line basis over the lease term. For operating leases, lease expense for minimum fixed lease payments is recognized on a straight-line basis over the lease term.
Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. Judgment is required to determine the SSP for each distinct performance obligation.
Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. 44 Judgment is required to determine the SSP for each distinct performance obligation.
Because control transfers over time, revenue is recognized based on progress toward completion of the performance 42 obligation. The method to measure progress toward completion requires judgment and is based on the nature of the products or services to be provided.
Because control transfers over time, revenue is recognized based on progress toward completion of the performance obligation. The method to measure progress toward completion requires judgment and is based on the nature of the products or services to be provided.
In these instances, the Company may use information such as the size of the customer and geographic region in determining the SSP. Valuation of Inventory. We review inventory for both potential obsolescence and potential loss of value periodically.
In these instances, we may use information such as the size of the customer and geographic region in determining the SSP. Valuation of Inventory. We review inventory for both potential obsolescence and potential loss of value periodically.
Specifically, loans incurred bear interest, at our option, at either LIBOR plus a margin ranging from 1.50% to 4.50% per year, or the base rate plus 0.50%, or the prime rate plus a margin ranging from 0.50% to 3.50% per year.
Specifically, loans incurred were to bear interest, at our option, at either LIBOR plus a margin ranging from 1.50% to 4.50% per year, or the base rate plus 0.50%, or the prime rate plus a margin ranging from 0.50% to 3.50% per year.
On August 29, 2022, we entered into a settlement agreement with AVCT which provided for, amongst other things, the cancellation of our investment in the Debenture Shares and the Warrants.
On August 29, 2022, we and AVCT entered into a settlement agreement which provided for, amongst other things, the cancellation of our investment in the Debenture Shares and the AVCT Warrants.
Pursuant to the settlement agreement, we also entered into a Wind Down Agreement with AVCT, pursuant to which a Reseller Agreement between the parties, as previously amended, was terminated, and the Company was granted a non-exclusive perpetual license to use and modify certain intellectual property owned by AVCT comprising WebRTC gateway technology that is integrated with Ribbon’s SBCs and Application Servers.
Pursuant to the settlement agreement, we also entered into a Wind Down Agreement with AVCT, pursuant to which a Reseller Agreement between the parties, as previously amended, was terminated, and we were granted a non-exclusive perpetual license to use and modify certain intellectual property owned by AVCT comprising WebRTC gateway technology that is integrated with Ribbon's SBCs and Application Servers.
In addition, the Facilities initiative included consolidating our global software laboratories and server farms into two lower cost North American sites. We continue to evaluate our properties included in the Facilities Initiative for accelerated amortization and/or right-of-use asset impairment. We expect that the actions under the Facilities Initiative will be substantially completed in 2023.
In addition, the Facilities Initiative included consolidating our global software laboratories and server farms into two lower cost North American sites. We continue to evaluate our properties included in the Facilities Initiative for accelerated amortization and/or right-of-use asset impairment. We expect that the actions under the Facilities Initiative will be substantially completed in 2024.
Subsequent to the Fifth Amendment, we are required to make quarterly principal payments on the 2020 Term Loan aggregating approximately $5.0 million per quarter through March 31, 2024 and $10.0 million in each of the three quarters thereafter, with the final payment approximating $275 million due on the maturity date in March 2025.
Subsequent to the Fifth Amendment, we are required to make quarterly principal payments on the 2020 Term Loan aggregating approximately $5.0 million per quarter through March 31, 2024 and $10.0 million in each of the three quarters thereafter, with the final payment due on the maturity date in March 2025.
During 2022 and 2021, we performed an analysis to determine if, based on all available evidence, we considered it more likely than not that some portion or all of the recorded deferred tax assets will not be realized in a future period.
During 2023 and 2022, we performed an analysis to determine if, based on all available evidence, we considered it more likely than not that some portion or all of the recorded deferred tax assets will not be realized in a future period.
As a result of our evaluations, in 2022, for the U.S. deferred tax assets, we concluded that deferred tax assets are generally realizable, with the exception of certain federal and state net operating loss carryforwards, as well as certain tax credits, that are not anticipated to be utilized.
As a result of our evaluations, in 2023, for the U.S. deferred tax assets, we concluded that deferred tax assets are generally realizable, with the exception of certain federal and state net operating loss carryforwards, as well as certain tax credits, that are not anticipated to be utilized.
If we elect to repatriate all of the funds held by our non-U.S. subsidiaries as of December 31, 2022, we do not believe that the amounts of potential withholding taxes that would arise from the repatriation would have a material effect on our liquidity.
If we elect to repatriate all of the funds held by our non-U.S. subsidiaries as of December 31, 2023, we do not believe that the amounts of potential withholding taxes that would arise from the repatriation would have a material effect on our liquidity.
We determined that there was no impairment of our Cloud and Edge segment in 2021. Leases . We account for our leases in accordance with Accounting Standards Codification ("ASC") 842, Leases ("ASC 842"). We have operating and finance leases for corporate offices, research and development facilities, and certain equipment.
We determined that there was no impairment of our Cloud and Edge segment in 2021. Leases . We account for our leases in accordance with Accounting Standards Codification ("ASC") 842, Leases ("ASC 842"). We have operating leases for corporate offices, and research and development facilities and historically had finance leases for certain equipment.
We believe that our general and administrative expenses in 2023 will increase slightly compared to our 2022 levels, primarily due to higher employee costs and as a result of inflation. Amortization of Acquired Intangible Assets included in Operating expenses.
We believe that our general and administrative expenses in 2024 will increase slightly compared to our 2023 levels, primarily due to higher employee costs and as a result of inflation. Amortization of Acquired Intangible Assets included in Operating expenses.
The rate at which we consume cash is dependent on the cash needs of our future operations, including our contractual obligations at December 31, 2022, primarily comprised of our debt principal and interest obligations as described above, and our operating lease and purchase obligations.
The rate at which we consume cash is dependent on the cash needs of our future operations, including our contractual obligations at December 31, 2023, primarily comprised of our debt principal and interest obligations as described above, and our operating lease and purchase obligations.
Recent Accounting Pronouncements In March 2022, the Financial Accounting Standards Board (the "FASB") issued ASU 2022-02, Financial Instruments – Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures (“ASU 2022-02”), which eliminates the accounting guidance on troubled debt restructurings ("TDRs") for creditors in ASC 310, Receivables (Topic 310) , and requires entities to provide disclosures about current period gross write-offs by year of origination.
In March 2022, the Financial Accounting Standards Board (the "FASB") issued ASU 2022-02, Financial Instruments – Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures (“ASU 2022-02”), which eliminates the accounting guidance on troubled debt restructurings for creditors in ASC 310, Receivables (Topic 310) , and requires entities to provide disclosures about current period gross write-offs by year of origination.
Accounting for Income Taxes. Our provision for income taxes is comprised of both current taxes and deferred taxes. The current income tax provision is generally calculated as the estimated taxes payable or refundable on tax returns to be filed for the year ended December 31, 2022.
Accounting for Income Taxes. Our provision for income taxes is comprised of both current taxes and deferred taxes. The current income tax provision is generally calculated as the estimated taxes payable or refundable on tax returns to be filed for the year ended December 31, 2023.
Cost of Revenue/Gross Margin. Our cost of revenue consists primarily of amounts paid to third-party manufacturers for purchased materials and services, royalties, amortization of acquired technology, inventory valuation adjustments, warranty costs, and manufacturing and services personnel and related costs.
Our cost of revenue consists primarily of amounts paid to third-party manufacturers for purchased materials and services, royalties, amortization of acquired technology, inventory valuation adjustments, warranty costs, and manufacturing and services personnel and related costs.
Interest expense in 2022 was primarily comprised of $ 16.0 million of interest on our outstanding term debt, $2.3 million in the aggregate related to amortization of debt issuance costs in connection with the 2020 Credit Facility (as defined below) and $1.7 million primarily related to factoring certain accounts receivable .
Interest expense in 2022 was primarily comprised of $16.0 million of interest on our outstanding term debt, $2.3 million in the aggregate related to amortization of debt issuance costs in connection with the 2020 Credit Facility (as defined below) and $1.7 million primarily related to factoring certain accounts receivable . Other (Expense) Income, Net .
Judgments concerning the recognition and measurement of a tax benefit might change as new information becomes available. Results of Operations Years Ended December 31, 2022 and 2021 Revenue.
Judgments concerning the recognition and measurement of a tax benefit might change as new information becomes available. Results of Operations Years Ended December 31, 2023 and 2022 Revenue.
In addition, the Fifth Amendment allows us to incur junior secured or unsecured debt in an amount no less than $50 million, subject to certain conditions, including the requirement that 50% of the aggregate amount of such incurred debt (net of certain costs, fees and other amounts) must be applied to prepay the 2020 Credit Facility, and compliance with certain leverage ratio-based covenant exceptions.
The Fifth 53 Amendment allowed us to incur junior secured or unsecured debt in an amount no less than $50 million, subject to certain conditions, including the requirement that 50% of the aggregate amount of such incurred debt (net of certain costs, fees and other amounts) must be applied to prepay the 2020 Credit Facility, and compliance with certain leverage ratio-based covenant exceptions.
Years Ended December 31, 2021 and 2020 For a comparison of our results of operations for the fiscal years ended December 31, 2021 and 2020, see "Part II, Item 7. MD&A" of our Annual Report on Form 10-K for the year ended December 31, 2021, filed with the SEC on March 11, 2022.
Years Ended December 31, 2022 and 2021 For a comparison of our results of operations for the fiscal years ended December 31, 2022 and 2021, see "Part II, Item 7. MD&A" of our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on March 31, 2023.
We provide a broad range of software and high-performance hardware products, solutions and services that enable the secure delivery of data and voice communications for residential consumers and for small, medium and large enterprises and industry verticals such as finance, education, government, utilities and transportation.
We provide a broad range of software and high-performance hardware products, network solutions, and services that enable the secure delivery of data and voice communications, and high-bandwidth networking and connectivity for residential consumers and for small, medium, and large enterprises and industry verticals such as finance, education, government, utilities, and transportation.
The gain in accumulated other comprehensive (loss) income related to the $60 million notional amount sold of $3.1 million is being released into earnings on a straight line basis over the remaining term of the 2020 Credit Facility as a decrease to interest expense, the amortization of which totaled $0.5 million for the year ended December 31, 2022.
The gain in Accumulated other comprehensive income related to the $60 million notional amount sold of $3.1 million is being released into earnings on a straight-line basis over the remaining term of the 2020 Credit Facility as a decrease to interest expense, the amortization of which totaled $0.9 million for the year ended December 31, 2023.
See "Results of Operations" in this MD&A for additional discussion of our results of operations for the years ended December 31, 2022 and 2021. Restructuring and Cost Reduction Initiatives In February 2022, our Board of Directors approved the 2022 Restructuring Plan to streamline the Company's operations in order to support the Company's investment in critical growth areas.
See "Results of Operations" in this MD&A for additional discussion of our results of operations for the years ended December 31, 2023 and 2022. 42 Restructuring and Cost Reduction Initiatives In February 2023, our Board of Directors approved the 2023 Restructuring Plan to streamline our operations in order to support our investment in critical growth areas.
Also, ASU 2022-02 updates the requirements related to accounting for credit losses under ASC 326, Financial Instruments – Credit Losses (Topic 326) , and adds enhanced disclosures for creditors with respect to loan refinancings and restructurings for borrowers experiencing financial difficulty. ASU 2022-02 is effective for the Company January 1, 2023.
Also, ASU 2022-02 updates the requirements related to accounting for credit losses under ASC 326, Financial Instruments – Credit Losses (Topic 326) , and adds enhanced disclosures for creditors with respect to loan refinancings and restructurings for borrowers experiencing financial difficulty. ASU 2022-02 became effective for us January 1, 2023.
Our ability to deliver our solutions as agreed upon with our customers depends in part on the ability of our global contract manufacturers, vendors, licensors and other business partners to deliver products or perform services we have procured from them. The Ongoing Military Conflict in Ukraine.
Our ability to deliver our solutions as agreed upon with our customers depends in part on the ability of our global contract manufacturers, vendors, licensors and other business partners to deliver products or perform services we have procured from them.
In connection with the 2019 Restructuring Initiative, we recorded restructuring and related expense of $0.7 million in 2022 comprised entirely of facilities related expense. We recorded restructuring and related expense of $7.0 million in 2021, 41 comprised of $5.7 million for variable and other facilities-related costs and $1.3 million of net expense for accelerated amortization of lease assets.
In connection with the 2019 Restructuring Initiative, we recorded no restructuring and related expense in 2023, $0.7 million in 2022 comprised entirely of facilities related expense and $7.0 million of such expense in 2021, comprised of $5.7 million for variable and other facilities-related costs and $1.3 million of net expense for accelerated amortization of lease assets.
In connection with this initiative, we recorded restructuring and related expense of $10.2 million in 2022, comprised of $3.3 million for variable and other facilities-related costs, $1.6 million for accelerated amortization of lease assets no longer being used with no ability or intent to sublease, and $5.3 million for severance and related costs for approximately 70 employees.
In 2022, we recorded $10.2 million of expense for the 2022 Restructuring Plan, comprised of $3.3 million for variable and other facilities-related costs, $1.6 million for accelerated amortization of lease assets no longer being used with no ability or intent to sublease, and $5.3 million for severance and related costs for approximately 70 employees.
Accordingly, we have maintained a valuation allowance on our U.S. deferred tax assets of $25.5 million. As a result of our evaluations for Israel, we maintained a full valuation allowance against our net deferred tax assets in Israel.
Accordingly, we have maintained a valuation allowance on our U.S. deferred tax assets of $ 23.9 million. As a result of our evaluations for Israel, we maintained a full valuation allowance against our net deferred tax assets in Israel.
On August 16, 2022, we sold another $30 million of the notional amount of our interest rate swap back to our counterparty for $1.6 million, reducing the notional amount to $340 million, which approximates the current level of our term loan debt outstanding.
On August 16, 2022, we sold another $30 million of the notional amount of our interest rate swap back to our counterparty for $1.6 million, reducing the notional amount to $340 million, which approximated the term loan debt then outstanding.
The amount of stock-based compensation expense recorded in any period for unvested awards requires estimates of the amount of stock-based awards that are expected to be forfeited prior to vesting, as well as assumptions regarding the probability that performance-based stock awards without market conditions will be earned. 44 Business Combinations.
The amount of stock-based compensation expense recorded in any period for unvested awards requires estimates of the amount of stock-based awards that are expected to be forfeited prior to vesting, as well as assumptions regarding the probability that performance-based stock awards without market conditions will be earned. Preferred Stock and Warrants.
Our 2022 investing activities were comprised of $10 million paid for purchases of property and equipment, and $3 million paid for purchases of software licenses, partially offset by $1 million of proceeds from the sale of business.
Our 2023 investing activities were used to purchase property and equipment and software licenses. Our 2022 investing activities were comprised of $10 million paid for purchases of property and equipment, and $3 million paid for purchases of software licenses, partially offset by $1 million of proceeds from the sale of a business.
We had cash held by our non-U.S. subsidiaries aggregating approximately $15 million and $60 million at December 31, 2022 and 2021, respectively.
We had cash held by our non-U.S. subsidiaries aggregating approximately $16 million and $15 million at December 31, 2023 and 2022, respectively.
The degree to which the ongoing COVID-19 pandemic, the ongoing military conflict in Ukraine and the high inflationary and rising interest rate environment impacts our future business, financial position and results of operations will depend on developments beyond our control, including the duration of the global economic downturn that has resulted from these factors.
The degree to which the ongoing wars in Israel and Ukraine and the inflationary and high interest rate environment impacts our future business, financial position and results of operations will depend on developments beyond our control, including the duration of the global economic downturn that has resulted from these factors. The Ongoing Wars in Israel and Ukraine .
The following customer contributed 10% or more of our revenue in the years ended December 31, 2022 and 2021: Year ended December 31, 2022 2021 Verizon Communications Inc. 15% 16% Revenue earned from customers domiciled outside the United States was 57% of total revenue in both 2022 and 2021.
The following customer contributed 10% or more of our revenue in the years ended December 31, 2023 and 2022: Year ended December 31, 2023 2022 Verizon Communications Inc. 11% 15% Revenue earned from customers domiciled outside the United States was 58% and 57% of total revenue in 2023 and 2022, respectively.
The significant accounting policies that we believe are the most critical include revenue recognition, the valuation of inventory, debentures and warrants received as sale consideration, warranty accruals, loss contingencies and reserves, stock-based compensation, business combinations, goodwill and intangible assets and accounting for income taxes. Revenue Recognition . We derive revenue from two primary sources: products and services.
The significant accounting policies that we believe are the most critical include revenue recognition, the valuation of inventory, debentures and warrants received as sale consideration, warranty accruals, loss contingencies and reserves, stock-based compensation, the Preferred Stock and Warrants, business combinations, goodwill and intangible assets, accounting for leases, and accounting for income taxes.
We recorded $1.6 million and $3.4 million of expense for accelerated rent amortization in the years ended December 31, 2022 and 2021, respectively. These amounts are included as components of Restructuring and related expense, and reduced our Operating lease right-of-use assets in our consolidated balance sheets at December 31, 2022 and 2021.
We recorded $1.0 million, $1.6 million and $3.4 million of expense for accelerated rent amortization in the years ended December 31, 2023, 2022 and 2021, respectively. These amounts are included as components of Restructuring and related expense in our statements of operations, reducing our Operating lease right-of-use assets in our consolidated balance sheets at the end of each respective year.
Our 2022 operating expenses included $29.6 million of amortization of acquired intangible assets, $6.3 million of acquisition-, disposal- and integration-related expense, and $10.8 million of restructuring and related expense.
Our 2023 operating expenses included $28.6 million of amortization of acquired intangible assets, $4.5 million of acquisition-, disposal- and integration-related expense, and $16.2 million of restructuring and related expense. Our 2022 operating expenses included $29.6 million of amortization of acquired intangible assets, $6.3 million of acquisition-, disposal- and integration-related expense, and $10.8 million of restructuring and related expense.
In the 1st and 2nd quarters of 2023, the Maximum Consolidated Net Leverage Ratio allowed declines to 3.25:1.00 and in all subsequent quarters the ratio will be fixed at 3.00:1.00.
In the first and second quarters of 2023, the Maximum Consolidated Net Leverage Ratio allowed declined to 3.25:1.00 and in all subsequent quarters the ratio will be fixed at 3.00:1.00.
We anticipate devoting substantial capital resources to continue our research and development efforts, to maintain our sales, support and marketing, to complete acquisition-related integration activities and for other general corporate activities. We further believe that our financial resources, along with managing discretionary expenses, will allow us to manage the ongoing impact of the COVID-19 pandemic on our business operations.
We anticipate devoting substantial capital resources to continue our research and development efforts, to maintain our sales, support and marketing, and for other general corporate activities. We further believe that our financial resources, along with managing discretionary expenses, will allow us to manage the ongoing impact of inflation and the supply chain disruptions on our business operations.
The sanctions continue to evolve and further changes in the current sanctions could further limit our ability to sell products and services to customers in Russia and, our ability to collect on outstanding accounts receivable from such customers.
These sanctions and restrictions currently prohibit our ability to sell certain products and services. The sanctions continue to evolve and further changes in the current sanctions or trade restrictions could further limit our ability to sell products and services to customers in Russia and, our ability to collect on outstanding accounts receivable from such customers.
The amount for accelerated amortization of lease assets was comprised of $3.4 million of expense and $2.1 million of income related to a lease modification for one of our restructured lease facilities. The amount accrued for severance and related costs was paid in 2021.
The amount of $1.3 million for accelerated amortization of lease assets was comprised of $3.4 million of expense, partially offset by $2.1 million of income related to a lease modification for one of our restructured lease facilities. The amount initially accrued for severance and related costs under this 2019 Restructuring Initiative was paid in 2021.
Operating leases are reported separately in our consolidated balance sheets at December 31, 2022 and 2021. Assets acquired under finance leases are included in Property and equipment, net, in our consolidated balance sheet at December 31, 2021. We had no finance leases at December 31, 2022. We determine if an arrangement is a lease at inception.
Operating leases are reported separately in our consolidated balance sheets. Assets acquired under finance leases, if any, are included in Property and equipment, net, in the consolidated balance sheets. We determine if an arrangement is a lease at inception.
Based on our current expectations, we believe our current cash and available borrowings under the 2020 Credit Facility, will be sufficient to meet our anticipated cash needs for working capital and capital expenditures for at least twelve months.
Based on our current expectations, we believe our current cash balance, the cash generated from our operations, and borrowings available under the 2020 Credit Facility, will be sufficient to meet our anticipated cash needs for working capital and capital expenditures for at least twelve months from the date of issuance of these financial statements.
The 2022 Restructuring Plan includes, among other things, charges related to a consolidation of facilities and a workforce reduction. Any positions eliminated in countries outside the United States are subject to local law and consultation requirements.
The 2023 Restructuring Plan include s, among other things , charges related to a workforce reduction. Any potential positions eliminated in countries outside the United States are subject to local law and consultation requirements.
Cash Flows from Financing Activities Our financing activities provided $1 million of cash in 2022, primarily due to $50 million of net proceeds from the Equity Offering, partially offset by $45 million of principal payments on the 2020 Credit Facility, including the voluntary $15 million incremental principal payment in connection with the Fourth Amendment and voluntary $10.0 million incremental principal payment in connection with the Fifth Amendment, and $3 million for the payment of tax withholding obligations related to the net share settlements of restricted stock awards upon vesting.
Our financing activities provided $1 million of cash in 2022, primarily due to $50 million of net proceeds from the private placement by us of 17,071,311 shares of our common stock, par value $0.0001 per share, at a price of $3.05 per share on August 12, 2022 (the "Equity Offering"), partially offset by $45 million of principal payments on the 2020 Credit Facility, including the voluntary $15 million incremental principal payment in connection with the Fourth Amendment and voluntary $10 million incremental principal payment in connection with the Fifth Amendment, and $3 million for the payment of tax withholding obligations related to the net share settlements of restricted stock awards upon vesting.
We recorded $11.7 million of restructuring and related expense in 2021, comprised of $4.6 million for severance and related costs, and $7.1 million for variable and other facilities-related costs, including $1.3 million of net expense for the accelerated amortization of lease assets.
We recorded restructuring and related expense of $16.2 million in 2023, comprised of $9.9 million for severance and related costs, and $6.3 million for variable and other facilities-related costs, including $1.0 million of net expense for the accelerated amortization of lease assets.
ASU 2021-08 is effective for the Company January 1, 2023. The Company believes that the adoption of ASU 2021-08 could have a material impact on its consolidated financial statements for periods including and subsequent to significant business acquisitions.
ASU 2021-08 was effective for us January 1, 2023. We believe the adoption of ASU 2021-08 could have a material impact on our consolidated financial statements for periods including and subsequent to significant business acquisitions.
Although headline inflation in the United States and Europe appears to have peaked, as gasoline and natural gas prices recede from the latest spike, core inflation (excluding food and energy prices) remains elevated and is a source of continued cost pressure on businesses and households.
Although headline inflation in the United States and Europe appears to have reached a peak , core inflation (excluding food and energy prices) remains elevated and is a source of continued cost pressure on businesses and households.
These amounts were partially offset by certain non-cash expenses, such as amortization of intangible assets, the decrease in the fair value of the AVCT Investment, stock-based compensation, as well as depreciation and amortization of property and equipment.
These amounts were partially offset by certain non-cash expenses, such as amortization of intangible assets, the decrease in the fair value of the AVCT Investment, stock-based compensation, as well as depreciation and amortization of property and equipment. Cash Flows from Investing Activities Our investing activities used $9 million and $12 million of cash in 2023 and 2022, respectively.
The Company believes that the adoption of ASU 2022-02 will not have a material impact on its consolidated financial statements upon adoption.
The adoption of ASU 2022-02 did not have a material impact on our consolidated financial statements upon adoption.
On July 22, 2022, we sold $30 million of the notional amount of our interest rate swap back to our counterparty for $1.5 million, reducing the notional amount of this swap to $370 million.
The swap was to mature on March 3, 2025, the same date the 2020 Credit Facility matures. On July 22, 2022, we sold $30 million of the notional amount of our interest rate swap back to our counterparty for $1.5 million, reducing the notional amount of this swap to $370 million.
In 2021, our Cloud and Edge gross margin was 61.7% and our IP Optical Networks gross margin was 35.1%. Our operating expenses were $449.3 million in 2022 and $562.5 million in 2021.
In 2022, our Cloud and Edge gross margin was 61.1% and our IP Optical Networks gross margin was 29.1%. Our operating expenses were $432.4 million in 2023 and $449.3 million in 2022.
Research and development expenses for the years ended December 31, 2022 and 2021 were as follows (in thousands, except percentages): Year ended December 31, Increase from prior year 2022 2021 $ % $ 203,676 $ 194,948 $ 8,728 4.5 % The increase in our research and development expenses in 2022 compared to 2021 was primarily attributable to approximately $17 million of higher expenses in our IP Optical Networks segment, partially offset by approximately $8 million of lower expenses in our Cloud and Edge segment.
R&D expenses for the years ended December 31, 2023 and 2022 were as follows (in thousands, except percentages): Year ended December 31, Decrease from prior year 2023 2022 $ % $ 190,660 $ 203,676 $ (13,016) (6.4) % The decrease in our research and development expenses in 2023 compared to 2022 was primarily attributable to approximately $8 million of lower expenses in our IP Optical Networks segment and approximately $5 million of lower expenses in our Cloud and Edge segment.
At December 31, 2022, we had $8.3 million of letters of credit, bank guarantees, performance and bid bonds outstanding (collectively, the "Guarantees"), comprised of the $3.3 million of letters of credit under the 2020 Credit Facility described above (the "Letters of Credit") and $5.0 million 53 of bank guarantees and performance and bid bonds (collectively, the "Other Guarantees") under various uncommitted facilities.
At December 31, 2023, we had $7.9 million of letters of credit, bank guarantees, and performance and bid bonds outstanding (collectively, "Guarantees"), comprised of $2.7 million of letters of credit under the 2020 Credit Facility described above (the "Letters of Credit") and $5.2 million of bank guarantees and performance and bid bonds (collectively, the "Other Guarantees").
These results are then used to calculate the grant date fair values. We are required to record expense through the respective final vesting dates regardless of the number of shares that are ultimately earned.
We are required to record expense through the respective final vesting dates regardless of the number of shares that are ultimately earned.
For the purpose of testing goodwill for impairment, all goodwill is assigned to a reporting unit, which may be either an operating segment or a portion of an operating segment.
For the purpose of testing goodwill for impairment, all goodwill is assigned to a reporting unit, which may be either an operating segment or a portion of an operating segment. Our reporting units are our two operating segments, Cloud and Edge and IP Optical Networks.
Other (Expense) Income, Net . We recorded other expense, net, aggregating $44.5 million in 2022, primarily comprised of $41.3 million of losses resulting from the change in the fair value of the AVCT Investment.
We recorded other expense, net of $44.5 million in 2022, primarily comprised of $41.3 million of losses resulting from the change in the fair value of the AVCT Investment. Income Taxes. We recorded an income tax provision of $10.8 million and income tax benefit of $14.5 million in 2023 and 2022, respectively.
The decrease in accrued expenses and other long-term liabilities was primarily due to employee-related cash payments and payments related to facilities, professional fees and royalties Cash Flows from Investing Activities Our investing activities used $12 million and $14 million of cash in 2022 and 2021, respectively.
Our operating activities used $26 million of cash in 2022, primarily resulting from our net loss, lower accrued expenses and other long-term liabilities, and higher inventory. The decrease in accrued expenses and other long-term liabilities was primarily due to employee-related cash payments and payments related to facilities, professional fees and royalties.
To accomplish this objective, we are using an interest rate swap as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.
Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for making fixed-rate payments over the life of an agreement without exchange of the underlying notional amount.
We recorded an income tax benefit of $14.5 million and $31.0 million in 2022 and 2021, respectively. The decrease in the tax benefit from 2021 to 2022 is a result of changes in the jurisdictional mix of pre-tax book income between those jurisdictions that have a valuation allowance and those that do not.
The change from a tax benefit in 2022 to a tax provision in 2023 is a result of changes in the jurisdictional mix of pre-tax book income between those jurisdictions that have a valuation allowance and those that do not.
We must make assumptions about future control premiums, market comparables, cash flows, operating plans, discount rates and other factors to determine recoverability. Our annual testing for impairment of goodwill is completed as of October 1. As described above, effective in the fourth quarter of 2020, we determined that we had two operating segments: Cloud and Edge, and IP Optical Networks.
We must make assumptions about future control premiums, market comparables, cash flows, operating plans, discount rates and other factors to determine recoverability. Our annual testing for impairment of goodwill is completed as of October 1.
We have provided for income taxes on the undistributed earnings of our non-U.S. subsidiaries as of December 31, 2022, excluding Ireland and Israel, which are indefinitely reinvested. Accordingly, we are required to recognize deferred taxes for 2022 on the outside basis differences related to the foreign subsidiaries, the largest of these differences being undistributed earnings.
We have provided for income taxes on the undistributed earnings of our non-U.S. subsidiaries as of December 31, 2023, excluding Ireland and Israel, which are indefinitely reinvested.
We have concluded that our software licenses are functional intellectual property that are distinct, as the user can benefit from the software on its own.
The software and hardware are delivered before related services are provided and are functional without professional services or customer support. We have concluded that our software licenses are functional intellectual property that are distinct, as the user can benefit from the software on its own.
Payments of debt issuance costs and principal payments of finance leases together totaled approximately $2 million. Our financing activities used $34 million of cash in 2021.
Payments of debt issuance costs and principal payments of finance leases together totaled approximately $2 million.
Our revenue was $845.0 million in 2021, comprised of $556.7 million attributable to Cloud and Edge and $288.3 million attributable to IP Optical Networks. Our gross profit was $400.9 million in 2022, comprised of $310.3 million attributable to Cloud and Edge and $90.6 million attributable to IP Optical Networks.
Our gross profit was $400.9 million in 2022, comprised of $310.3 million attributable to Cloud and Edge and $90.6 million attributable to IP Optical Networks. Our gross margin was 49.4% in 2023 and 48.9% in 2022. In 2023, our Cloud and Edge gross margin was 62.8% and our IP Optical Networks gross margin was 31.0%.
At December 31, 2021, we had an outstanding balance under the 2020 Term Loan of $375.5 million at an average interest rate of 3.4% and $4.3 million of letters of credit outstanding with an interest rate of 2.5%. We were in compliance with all covenants of the 2020 Credit Facility at both December 31, 2022 and 2021 .
At December 31, 2023, we had an outstanding balance under the 2020 Term Loan of $235.4 million at an average interest rate of 10.0% and $2.7 million of letters of credit outstanding with an interest rate of 4.5%.
The increased expense also includes higher employee costs as a result of inflationary pressures. The increased investment in IP Optical Networks R&D is focused on significantly expanding our portfolio of IP Routing solutions, adding additional features to our Optical Transport portfolio, and investment in a next generation SDN management and orchestration platform.
The reduced expenses are a combination of lower employee headcount and outside subcontractors. 50 Our IP Optical Networks R&D investment is focused on significantly expanding our portfolio of IP Routing solutions, adding additional features and capabilities to our Optical Transport portfolio, and supporting features in our next generation SDN management and orchestration platform.
The 2019 Restructuring Initiative includes facility consolidations, refinement of our research and development activities, and a reduction in workforce.
In 2019, we implemented a restructuring plan to streamline our global footprint, improve our operations and enhance our customer delivery (the "2019 Restructuring Initiative"). The 2019 Restructuring Initiative includes facility consolidations, refinement of our research and development activities, and a reduction in workforce.
If these comparisons indicate that an asset is not recoverable, we will recognize an impairment loss for the amount by which the carrying value of the asset exceeds the related estimated fair value. Judgment is required in determining whether an event has occurred that may impair the value of goodwill, identifiable intangible assets or other long-lived assets.
If these comparisons indicate that an asset is not recoverable, we will recognize an impairment loss for the amount by which the carrying value of the asset exceeds the related estimated fair value.