Biggest changeWe will continue to use significant judgment in evaluating the expected term, volatility and forfeiture rate related to our stock-based compensation. 77 Table of Contents Results of Operations Comparison of the Years Ended December 31, 2023 and 2022 The following table presents our results of operations for the periods indicated: Year Ended December 31, Change (In thousands) 2023 2022 $ % Consolidated Statement % of % of of Operations Data: revenue revenue Revenue Sales revenue $ 239,493 87 % $ 211,345 86 % $ 28,148 13 % Rental revenue 34,930 13 % 35,440 14 % (510) (1) % Total revenue 274,423 100 % 246,785 100 % 27,638 11 % Cost of revenue Cost of sales revenue 66,713 24 % 59,619 24 % 7,094 12 % Cost of rental revenue 12,577 5 % 11,190 5 % 1,387 12 % Total cost of revenue 79,290 29 % 70,809 29 % 8,481 12 % Gross profit Gross profit - sales revenue 172,780 63 % 151,726 62 % 21,054 14 % Gross profit - rental revenue 22,353 8 % 24,250 9 % (1,897) (8) % Gross profit 195,133 71 % 175,976 71 % 19,157 11 % Operating expenses Sales and marketing 107,119 39 % 106,418 43 % 701 1 % Research and development 7,823 3 % 7,088 3 % 735 10 % Reimbursement, general and administrative 62,074 22 % 60,796 25 % 1,278 2 % Intangible asset amortization and earn-out 76 — % 14,432 5 % (14,356) (99) % Total operating expenses 177,092 64 % 188,734 76 % (11,642) (6) % Income (loss) from operations 18,041 7 % (12,758) (5) % 30,799 241 % Other expense (2,271) (1) % (2,715) (1) % 444 (16) % Income (loss) before income taxes 15,770 6 % (15,473) (6) % 31,243 202 % Income tax (benefit) expense (12,745) (5) % 2,393 1 % (15,138) N.M. % Net income (loss) $ 28,515 11 % $ (17,866) (7) % $ 46,381 260 % “N.M.” Not Meaningful Revenue Revenue increased $27.6 million, or 11%, to $274.4 million in the year ended December 31, 2023, compared to $246.8 million in the year ended December 31, 2022.
Biggest changeChanges in contractual pricing, payment trends and rebate structures would impact, either positively or negatively, our sales and rental revenue. 75 Table of Contents Results of Operations Comparison of the Years Ended December 31, 2024 and 2023 The following table presents our results of operations for the periods indicated: Year Ended December 31, Change (In thousands) 2024 2023 $ % Condensed Consolidated Statement % of % of of Operations Data: revenue revenue Revenue Sales revenue $ 256,012 87 % $ 239,493 87 % $ 16,519 7 % Rental revenue 36,972 13 % 34,930 13 % 2,042 6 % Total revenue 292,984 100 % 274,423 100 % 18,561 7 % Cost of revenue Cost of sales revenue 64,815 22 % 66,713 24 % (1,898) (3) % Cost of rental revenue 11,481 4 % 12,577 5 % (1,096) (9) % Total cost of revenue 76,296 26 % 79,290 29 % (2,994) (4) % Gross profit Gross profit - sales revenue 191,197 65 % 172,780 63 % 18,417 11 % Gross profit - rental revenue 25,491 9 % 22,353 8 % 3,138 14 % Gross profit 216,688 74 % 195,133 71 % 21,555 11 % Operating expenses Sales and marketing 112,009 38 % 107,119 39 % 4,890 5 % Research and development 8,832 3 % 7,823 3 % 1,009 13 % Reimbursement, general and administrative 71,135 24 % 62,074 22 % 9,061 15 % Intangible asset amortization and earn-out 2,531 1 % 76 — % 2,455 N.M. % Total operating expenses 194,507 66 % 177,092 64 % 17,415 10 % Income from operations 22,181 8 % 18,041 7 % 4,140 (23) % Interest income 3,384 1 % 1,874 1 % 1,510 81 % Interest expense (2,085) (1) % (4,147) (2) % 2,062 50 % Other income 9 — % 2 — % 7 N.M. % Income before income taxes 23,489 8 % 15,770 6 % 7,719 (49) % Income tax expense (benefit) 6,529 2 % (12,745) (5) % 19,274 (151) % Net income $ 16,960 6 % $ 28,515 11 % $ (11,555) 41 % “N.M.” Not Meaningful Revenue Revenue increased $18.6 million, or 7%, to $293.0 million in the year ended December 31, 2024, compared to $274.4 million in the year ended December 31, 2023.
Our current lymphedema products are the Flexitouch Plus and Entre Plus systems and our airway clearance product is the AffloVest. A predecessor to our Flexitouch system received 510(k) clearance from the U.S. Food and Drug Administration (the “FDA”) in July 2002, and we introduced the system to address the many limitations of self-administered home-based manual lymphatic drainage therapy.
Our current lymphedema products are the Flexitouch Plus, Entre Plus and Nimbl systems and our airway clearance product is the AffloVest. A predecessor to our Flexitouch system received 510(k) clearance from the U.S. Food and Drug Administration (the “FDA”) in July 2002, and we introduced the system to address the many limitations of self-administered home-based manual lymphatic drainage therapy.
We recognize revenue when control of the product has been transferred to our customer, in the amount of the expected consideration to be received for the product. Expected consideration is estimated as follows: ● Flexitouch Plus and Entre Plus systems. Expected consideration to be received is estimated based on a detailed review of historical pricing adjustments and collections.
We recognize revenue when control of the product has been transferred to our customer, in the amount of the expected consideration to be received for the product. Expected consideration is estimated as follows: ● Flexitouch Plus, Entre Plus and Nimbl systems. Expected consideration to be received is estimated based on a detailed review of historical pricing adjustments and collections.
The Credit Agreement provides that, subject to satisfaction of certain conditions, we may increase the amount of the revolving loans available under the Credit Agreement and/or add one or more term loan facilities in an amount not to exceed $25.0 million in the aggregate, such that the total aggregate principal amount of loans available under the Credit Agreement (including under the revolving credit facility) does not exceed $80.0 million. On September 8, 2021, in connection with the closing of the acquisition of the AffloVest business, we borrowed the $30.0 million term loan and utilized that borrowing, together with a draw of $25.0 million under the revolving credit facility and cash on hand, to fund the purchase price. On February 22, 2022, we entered into a Second Amendment Agreement (the “Second Amendment”), which further amends the Credit Agreement.
The Credit Agreement provides that, subject to satisfaction of certain conditions, we may increase the amount of the revolving loans available under the Credit Agreement and/or add one or more term loan facilities in an amount not to exceed $25.0 million in the aggregate, such that the total aggregate principal amount of loans available under the Credit Agreement (including under the revolving credit facility) does not exceed $80.0 million. On September 8, 2021, in connection with the closing of the acquisition of the AffloVest business, we borrowed the $30.0 million term loan and utilized that borrowing, together with a draw of $25.0 million under the revolving credit facility and cash on hand, to fund the purchase price. On February 22, 2022, we entered into a Second Amendment Agreement (the “Second Amendment”), which further amended the Credit Agreement.
We believe our cash, cash equivalents and cash flows from operations will be sufficient to meet our working capital, capital expenditure, debt repayment and related interest, and other cash requirements for at least the next twelve months.
We believe our cash and cash flows from operations will be sufficient to meet our working capital, capital expenditure, debt repayment and related interest, and other cash requirements for at least the next twelve months.
To the extent our revenue grows, we expect sales and marketing expenses to decrease as a percentage of revenue over time. 74 Table of Contents Research and Development Expenses Research and development, or R&D, expenses consist primarily of personnel-related expenses, third-party product development costs, laboratory supplies, consulting fees and related costs, clinical research expenses, expenses related to clinical and regulatory affairs, patent amortization costs, stock-based compensation and patent legal fees, including defense costs, and testing costs for new product launches.
To the extent our revenue grows, we expect sales and marketing expenses to decrease as a percentage of revenue over time. 73 Table of Contents Research and Development Expenses Research and development, or R&D, expenses consist primarily of personnel-related expenses, third-party product development costs, laboratory supplies, consulting fees and related costs, clinical research expenses, expenses related to clinical and regulatory affairs, patent amortization costs, stock-based compensation and patent legal fees, including defense costs, and testing costs for new product launches.
The AffloVest device is sold through respiratory durable medical equipment providers throughout the United States that service patients and bill third-party payers for the product. We also employ a small group of respiratory specialists, who educate DME representatives, provide product demonstrations for targeted clinicians and support technical 72 Table of Contents questions related to the AffloVest.
The AffloVest device is sold through respiratory durable medical equipment providers throughout the United States that service patients and bill third-party payers for the product. We also employ a small group of respiratory specialists, who educate DME representatives, provide product demonstrations for targeted 71 Table of Contents clinicians and support technical questions related to the AffloVest.
Components of our Results of Operations Revenue We derive revenue from sales and rentals of our Flexitouch Plus and Entre Plus systems to patients in the United States.
Components of our Results of Operations Revenue We derive revenue from sales and rentals of our Flexitouch Plus, Entre Plus and Nimbl systems to patients in the United States.
Inflation and changing prices did not have a material effect on our business during the year ended December 31, 2023, and we do not expect that inflation or changing prices will materially affect our business for at least the next twelve months.
Inflation and changing prices did not have a material effect on our business during the year ended December 31, 2024, and we do not expect that inflation or changing prices will materially affect our business for at least the next twelve months.
All tenors of term SOFR are subject to a credit spread adjustment of 0.10% (“Adjusted Term SOFR”). On August 1, 2023, we entered into a Fourth Amendment Agreement (the “Fourth Amendment”), which further amends the Credit Agreement.
All tenors of term SOFR are subject to a credit spread adjustment of 0.10% (“Adjusted Term SOFR”). On August 1, 2023, we entered into a Fourth Amendment Agreement (the “Fourth Amendment”), which further amended the Credit Agreement.
However, any reversal in these recent trends could have a negative impact on our future revenue. We sell or rent our Flexitouch Plus and Entre Plus systems either directly to patients or to the Veterans Administration on behalf of patients, who are referred to us by physicians, therapists or nurses.
However, any reversal in these recent trends could have a negative impact on our future revenue. We sell or rent our Flexitouch Plus, Entre Plus and Nimbl systems either directly to patients or to the Veterans Administration on behalf of patients, who are referred to us by physicians, clinical lymphatic therapists or nurses.
The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets and liabilities, and related disclosure of contingent 75 Table of Contents assets and liabilities, revenue and expenses at the date of the financial statements.
The preparation of these financial statements requires us to make estimates and judgments that affect the reported amounts of assets and liabilities, and related disclosure of contingent 74 Table of Contents assets and liabilities, revenue and expenses at the date of the financial statements.
In addition, the Fourth Amendment provided for an additional term loan in the amount of $8.25 million, which we used for a paydown of the revolving 82 Table of Contents credit facility.
In addition, the Fourth Amendment provided for an additional term loan in the amount of $8.25 million, which we used for a paydown 80 Table of Contents of the revolving credit facility.
Therefore, we consider an understanding of the variability and judgment required in making these estimates and assumptions to be critical in fully understanding and evaluating our reported financial results. Revenue Recognition We derive revenue from the sales and rentals of our proprietary line of Flexitouch Plus and Entre Plus systems, and from sales of our AffloVest product.
Therefore, we consider an understanding of the variability and judgment required in making these estimates and assumptions to be critical in fully understanding and evaluating our reported financial results. Revenue Recognition We derive lymphedema product revenue from the sales and rentals of our proprietary line of Flexitouch Plus, Entre Plus and Nimbl systems.
Discussion of 2021 results and year-over-year comparisons between 2022 and 2021 that are not included in this Annual Report on Form 10-K can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part II, Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2022, filed with the SEC on February 21, 2023.
Discussion of 2022 results and year-over-year comparisons between 2023 and 2022 that are not included in this Annual Report on Form 10-K can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in Part II, Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2023, filed with the SEC on February 20, 2024.
AffloVest is a portable, wearable vest that provides airway clearance to treat patients with chronic respiratory conditions such as bronchiectasis or conditions resulting from neuromuscular disorders. For the years ended December 31, 2023 and 2022, sales of AffloVest represented 12% and 14% of our revenue, respectively.
AffloVest is a portable, wearable vest that provides airway clearance to treat patients with chronic respiratory conditions such as bronchiectasis or conditions resulting from neuromuscular disorders. For the years ended December 31, 2024 and 2023, sales of AffloVest represented 11% and 12% of our revenue, respectively.
This Management’s Discussion and Analysis of Financial Condition and Results of Operations focuses on discussion of year-over-year comparisons between 2023 and 2022.
This Management’s Discussion and Analysis of Financial Condition and Results of Operations focuses on discussion of year-over-year comparisons between 2024 and 2023.
We rely on third-party contract manufacturers for the sourcing of parts, the assembly of our controllers and the manufacturing of the garments used with our systems. We conduct final assembly of the garments used with our products, perform quality assurance and ship our products from our facility in Minnesota.
We rely on third-party contract manufacturers for the sourcing of parts, the assembly of our controllers and the manufacturing of the garments used with our systems. We conduct final assembly of the garments used with our products, perform quality assurance and ship our products from our facility in Minnesota. We manufacture and ship the AffloVest device from our Minnesota-based facility.
In July 2022, we launched Kylee™, a free mobile application that allows for patients to manage their conditions by tracking treatments and symptoms, as well as having direct access to educational resources. For the year ended December 31, 2023, we generated revenue of $274.4 million and had net income of $28.5 million, compared to revenue of $246.8 million and a net loss of $17.9 million for the year ended December 31, 2022, and revenue of $208.1 million and a net loss of $11.8 million for the year ended December 31, 2021.
In July 2022, we launched Kylee™, a free mobile application that allows for patients to manage their conditions by tracking treatments and symptoms, as well as having direct access to educational resources. For the year ended December 31, 2024, we generated revenue of $293.0 million and had net income of $17.0 million, compared to revenue of $274.4 million and net income of $28.5 million for the year ended December 31, 2023, and revenue of $246.8 million and a net loss of $17.9 million for the year ended December 31, 2022.
To support the growth of our business, we continue to invest in our commercial infrastructure, consisting of our direct sales force, training resources, reimbursement capabilities and clinical expertise. We market our lymphedema products in the United States using a direct-to-patient and -provider model.
To support the growth of our business, we continue to invest in our commercial infrastructure, consisting of our direct sales force, DME sales team, patient education team, reimbursement capabilities and clinical expertise. We market our lymphedema products in the United States using a direct-to-patient and -provider model.
This seasonality applies only to purchases and rentals of our products by patients covered by commercial insurance and is not relevant to Medicare, Medicaid or the Veterans Administration, as those payers either do not have plans that have declining deductibles over the course of the plan year and/or do not have plans that include patient deductibles for purchases or rentals of our products. 80 Table of Contents Liquidity and Capital Resources Overview As of December 31, 2023, we had cash and cash equivalents of $61.0 million and net accounts receivable of $54.1 million compared to cash and cash equivalents of $21.9 million and net accounts receivable of $77.9 million as of December 31, 2022.
This seasonality applies only to purchases and rentals of our products by patients covered by commercial insurance and is not relevant to Medicare, Medicaid or the Veterans Administration, as those payers either do not have plans that have declining deductibles over the course of the plan year and/or do not have plans that include patient deductibles for purchases or rentals of our products. 78 Table of Contents Liquidity and Capital Resources Overview As of December 31, 2024, we had cash of $94.4 million and net accounts receivable of $44.9 million compared to cash of $61.0 million and net accounts receivable of $54.1 million as of December 31, 2023.
Net Cash Used in Investing Activities Net cash used in investing activities during the year ended December 31, 2023, was $2.5 million, primarily consisting of $2.3 million in purchases of property and equipment primarily related to production tooling and office equipment and $0.2 million related to the acquisition of patents and other intangible assets.
Net Cash Used in Investing Activities Net cash used in investing activities during the year ended December 31, 2024, was $2.5 million, primarily consisting of $2.4 million in purchases of property and equipment primarily related to tenant improvements, production tooling and office equipment and $0.1 million related to the acquisition of patents and other intangible assets.
We bill payers, such as private insurers, Medicare, or Medicaid, on behalf of our patients and bill patients directly for their cost-sharing amounts, including any portion of an unsatisfied deductible and any copayments or co-insurance.
We bill payers, such as private insurers, Medicare, or Medicaid, on behalf of our patients and bill patients directly for their cost-sharing amounts, including any portion of an unsatisfied deductible and any copayments or co-insurance. We bill the Veterans Administration directly for the purchase or lease of our product on behalf of the patient.
Adequacy of Resources Our future cash requirements may vary significantly from those now planned and will depend on many factors, including: ● the impact of inflation, rising interest rates or a recession on our business; ● sales and marketing resources needed to further penetrate our market; ● expansion of our operations; ● response of competitors to our solutions and applications; ● costs associated with clinical research activities; ● increases in interest rates; 83 Table of Contents ● labor shortages and wage inflation; ● component price inflation; ● costs to develop and implement new products; and ● use of capital for acquisitions or licenses, if any.
(4) Interest payment amounts on long-term debt are calculated using outstanding balances and interest rates in effect on December 31, 2024. 81 Table of Contents Adequacy of Resources Our future cash requirements may vary significantly from those now planned and will depend on many factors, including: ● the impact of inflation, rising interest rates or a recession on our business; ● sales and marketing resources needed to further penetrate our market; ● expansion of our operations; ● IT investments to scale our business; ● response of competitors to our solutions and applications; ● costs associated with clinical research activities; ● increases in interest rates; ● labor shortages and wage inflation; ● component price inflation; ● costs to develop and implement new products; and ● use of capital for acquisitions or licenses, if any.
We update our assessment of collectability on a quarterly basis, with any adjustments for Flexitouch Plus and Entre Plus systems being reflected as sales and rental revenue and AffloVest products being reflected as bad debt expense within reimbursement, general and administrative expenses in the Consolidated Statements of Operations in the period of adjustment.
We update our assessment of collectability on a quarterly basis, with any adjustments for Flexitouch Plus, Entre Plus and Nimbl systems being reflected as sales and rental revenue in the Consolidated Statements of Operations in the period of adjustment.
Sales and Marketing Expenses Sales and marketing expenses increased $0.7 million, or 1%, to $107.1 million during the year ended December 31, 2023, compared to $106.4 million during the year ended December 31, 2022.
Sales and Marketing Expenses Sales and marketing expenses increased $4.9 million, or 5%, to $112.0 million during the year ended December 31, 2024, compared to $107.1 million during the year ended December 31, 2023.
The increase was primarily attributable to a: ● $1.6 million increase in personnel-related compensation expense as a result of increased headcount in our reimbursement operations, payer relations and corporate functions; ● $0.9 million increase in IT related expenses; and ● $0.2 million increase in travel and entertainment expenses.
The increase was primarily attributable to a: ● $5.0 million increase in personnel-related compensation expense as a result of increased headcount in our reimbursement operations, payer relations and corporate functions; ● $2.8 million increase in IT related expenses; and ● $1.3 million increase occupancy costs, depreciation expense and professional fees.
Net cash used in investing activities during the year ended December 31, 2022, was $1.9 million, primarily consisting of $1.8 million in purchases of property and equipment primarily related to office equipment, production tooling and tenant improvements and $0.1 million related to the acquisition of patents and other intangible assets. 81 Table of Contents Net Cash Provided by (Used in) Financing Activities Net cash provided by financing activities during the year ended December 31, 2023, was $5.7 million, primarily consisting of net proceeds from the offering of our common stock of $34.6 million, $8.3 million in borrowings under our term loan, and $1.5 million in proceeds from the issuance of common stock under the ESPP, partially offset by payments of $25.0 million on the revolving credit facility, $10.6 million on the AffloVest earn-out, and $3.0 million on our term loan.
Net cash provided by financing activities during the year ended December 31, 2023, was $5.7 million, primarily consisting of net proceeds from the offering of our common stock of $34.6 million, $8.3 million in borrowings under our term loan, and $1.5 million in proceeds from the issuance of common stock under the ESPP, partially offset by payments of $25.0 million on the revolving credit facility, $10.6 million on the AffloVest earn-out, and $3.0 million on our term loan.
Net cash provided by operating activities during the year ended December 31, 2022, was $5.2 million, resulting from a net loss of $17.9 million and non-cash net income adjustments of $27.7 million, which were offset by a change in net operating assets and liabilities of $4.6 million.
Net cash provided by operating activities during the year ended December 31, 2023, was $35.9 million, resulting from net income of $28.5 million and a change in operating assets and liabilities of $15.1 million, which were partially offset by non-cash net income adjustments of $7.8 million.
Sales and rentals of our lymphedema products represented 88% and 86% of our revenue in the years ended December 31, 2023 and 2022, respectively. On September 8, 2021, we acquired the assets of the AffloVest airway clearance product line from International Biophysics Corporation (“IBC”), a privately-held company which developed and manufactured AffloVest.
Sales and rentals of our lymphedema products represented 89% and 88% of our revenue in the years ended December 31, 2024 and 2023, respectively. On September 8, 2021, we acquired the assets of the AffloVest airway clearance product line.
Future Cash Requirements Our material estimated future cash requirements under our contractual obligations and commercial commitments as of December 31, 2023, in total and disaggregated into current (payable in 2024) and long-term (payable after 2024) obligations, are summarized as follows: Payments Due By Period Less Than More Than (In thousands) Total 1 Year 1-3 Years 3-5 Years 5 Years Purchase commitments (1) $ 24,291 $ 24,291 $ — $ — $ — Operating lease obligations (2) 24,232 3,539 7,359 6,395 6,939 Note payable payments (3) 29,250 3,000 26,250 — — Interest payments (4) 5,160 2,189 2,971 — — Total $ 82,933 $ 33,019 $ 36,580 $ 6,395 $ 6,939 (1) We issued purchase orders in 2023 totaling $24.3 million for goods that we expect to receive and pay for in 2024.
Future Cash Requirements Our material estimated future cash requirements under our contractual obligations and commercial commitments as of December 31, 2024, in total and disaggregated into current (payable in 2025) and long-term (payable after 2025) obligations, are summarized as follows: Payments Due By Period Less Than More Than (In thousands) Total 1 Year 1-3 Years 3-5 Years 5 Years Purchase commitments (1) $ 22,752 $ 22,752 $ — $ — $ — Operating lease obligations (2) 21,131 3,736 7,119 6,584 3,692 Note payable payments (3) 26,250 3,000 23,250 — — Interest payments (4) 2,477 1,622 855 — — Total $ 72,610 $ 31,110 $ 31,224 $ 6,584 $ 3,692 (1) We issued purchase orders in 2024 totaling $22.8 million for goods that we expect to receive and pay for in 2025.
Cash Flows The following table summarizes our cash flows for the periods indicated: Year Ended December 31, (In thousands) 2023 2022 Net cash provided by (used in): Operating activities $ 35,855 $ 5,209 Investing activities (2,481) (1,909) Financing activities 5,730 (9,600) Net increase (decrease) in cash and cash equivalents $ 39,104 $ (6,300) Net Cash Provided by Operating Activities Net cash provided by operating activities during the year ended December 31, 2023, was $35.9 million, resulting from net income of $28.5 million and a change in operating assets and liabilities of $15.1 million, which were partially offset by non-cash net income adjustments of $7.8 million.
Cash Flows The following table summarizes our cash flows for the periods indicated: Year Ended December 31, (In thousands) 2024 2023 Net cash provided by (used in): Operating activities $ 40,655 $ 35,855 Investing activities (2,497) (2,481) Financing activities (4,824) 5,730 Net increase in cash $ 33,334 $ 39,104 Net Cash Provided by Operating Activities Net cash provided by operating activities during the year ended December 31, 2024, was $40.7 million, resulting from net income of $17.0 million, non-cash net income adjustments of $16.0 million and a change in operating assets and liabilities of $7.7 million.
Specifically, payment history of the applicable payer, as well as historical patient collections, serve as primary sources of information in estimating expected consideration. ● AffloVest product. Expected consideration to be received is based on agreements in place with DME providers.
Specifically, payment history of the applicable payer, as well as historical patient collections, serve as primary sources of information in estimating expected consideration.
As of December 31, 2023, we employed 254 field sales representatives for our lymphedema products and a team of 16 supporting our airway clearance products. This compares to 241 field sales representatives (excluding 9 key account managers) for our lymphedema products and a team of 10 specialists supporting our airway clearance products as of December 31, 2022.
As of December 31, 2024, we employed 169 account managers and 111 specialists for our lymphedema products and a team of 18 specialists supporting our airway clearance products. This compares to 150 account managers and 104 specialists for our lymphedema products and a team of 16 specialists supporting our airway clearance products as of December 31, 2023.
Research and Development Expenses Research and development (“R&D”) expenses increased $0.7 million, or 10%, to $7.8 million during the year ended December 31, 2023, compared to $7.1 million during the year ended December 31, 2022, which was primarily attributable to an increase in personnel-related expenses. 79 Table of Contents Reimbursement, General and Administrative Expenses Reimbursement, general and administrative expenses increased $1.3 million, or 2%, to $62.1 million during the year ended December 31, 2023, compared to $60.8 million during the year ended December 31, 2022.
Research and Development Expenses Research and development (“R&D”) expenses increased $1.0 million, or 13%, to $8.8 million during the year ended December 31, 2024, compared to $7.8 million during the year ended December 31, 2023, which was primarily attributable to a $0.6 million increase in professional fees and a $0.5 million increase in personnel-related expenses.
Revenue from Medicare represented 24% and 19% of total revenue for the years ended December 31, 2023 and 2022, respectively. 78 Table of Contents The following table summarizes our revenue by product line for the years ended December 31, 2023 and 2022, both in dollars and percentage of total revenue: Year Ended December 31, Change (In thousands) 2023 2022 $ % Revenue Lymphedema products $ 241,721 $ 212,266 $ 29,455 14% Airway clearance products 32,702 34,519 (1,817) (5)% Total $ 274,423 $ 246,785 $ 27,638 11% Percentage of total revenues Lymphedema products 88% 86% Airway clearance products 12% 14% Total 100% 100% Cost of Revenue and Gross Margin Cost of revenue increased $8.5 million, or 12%, to $79.3 million during the year ended December 31, 2023, compared to $70.8 million during the year ended December 31, 2022.
Revenue from Medicare represented 18% and 24% of total revenue for the years ended December 31, 2024 and 2023, respectively. The following table summarizes our revenue by product line for the years ended December 31, 2024 and 2023, both in dollars and percentage of total revenue: Year Ended December 31, Change (In thousands) 2024 2023 $ % Revenue Lymphedema products $ 259,361 $ 241,721 $ 17,640 7% Airway clearance products 33,623 32,702 921 3% Total $ 292,984 $ 274,423 $ 18,561 7% Percentage of total revenues Lymphedema products 89% 88% Airway clearance products 11% 12% Total 100% 100% Cost of Revenue and Gross Margin Cost of revenue decreased $3.0 million, or 4%, to $76.3 million during the year ended December 31, 2024, compared to $79.3 million during the year ended December 31, 2023.
(3) Reflects principal payment obligations under our term loan. Refer to Note 11 ‘‘Credit Agreement’’ to our consolidated financial statements included in this report for additional information regarding the maturities of debt principal. (4) Interest payment amounts on long-term debt are calculated using outstanding balances and interest rates in effect on December 31, 2023.
Furthermore, we lease office equipment from time-to-time based on our needs and these commitments are classified as operating leases. (3) Reflects principal payment obligations under our term loan. Refer to Note 11 ‘‘Credit Agreement’’ to our consolidated financial statements included in this report for additional information regarding the maturities of debt principal.
The increase in cost of revenue was primarily attributable to the increase in sales and rentals of the lymphedema product line. Gross margin was 71% in each of the years ended December 31, 2023 and 2022.
The decrease in cost of revenue was primarily attributable to lower manufacturing and warranty costs. Gross margin was 74% and 71% in the years ended December 31, 2024 and 2023, respectively.
The Fourth Amendment also extended the maturity date of the term loans and revolving credit facility under the Credit Agreement from September 8, 2024 to August 1, 2026. On December 21, 2023, we made a payment of $16.8 million to repay in full the outstanding balance on the revolving credit facility. As of December 31, 2023, we had outstanding borrowings of $29.3 million under the Credit Agreement, comprised entirely of the term loan.
The Fifth Amendment permits the Company to make payments to repurchase shares of its common stock, as long as the Company is not in default before and after giving effect to such repurchases, and as long as such repurchases do not exceed $30.0 million. On December 21, 2023, we made a payment of $16.8 million to repay in full the outstanding balance on the revolving credit facility. As of December 31, 2024, we had outstanding borrowings of $26.3 million under the Credit Agreement, comprised entirely of the term loan.
Income Tax Expense We recorded an income tax benefit of $12.7 million and an income tax expense of $2.4 million for the years ended December 31, 2023 and 2022, respectively. The current year tax benefit was primarily driven by the release of the valuation allowance related to the future realization of deferred tax assets.
Income Tax Expense We recorded an income tax expense of $6.5 million and an income tax benefit of $12.7 million for the years ended December 31, 2024 and 2023, respectively.
These increases were partially offset by a $0.3 million decrease in travel and entertainment expenses and a $0.3 million decrease related to sales meetings and tradeshows.
The increase was primarily attributable to a: ● $2.5 million increase in personnel-related compensation expense; ● $1.6 million increase in travel and entertainment expenses; ● $0.6 million increase in expenses related to meetings and tradeshows ; and ● $0.4 million increase in general office and printing expenses. These increases were partially offset by a $0.2 million decrease in educational grants.
We bill the Veterans Administration directly for the purchase or lease of our product on behalf of the patient. 73 Table of Contents Approximately 10% of our revenue in each of 2023 and 2022 came from the Veterans Administration. Approximately 24% of our revenue in 2023 and 19% of our revenue in 2022 came from Medicare patients.
Approximately 11% of our revenue in 2024 and 10% of our revenue in 2023 72 Table of Contents came from the Veterans Administration. Approximately 18% of our revenue in 2024 and 24% of our revenue in 2023 came from Medicare patients.
These increases were partially offset by a $1.4 million decrease in occupancy costs, depreciation expense and professional fees. Intangible Asset Amortization and Earn-out Intangible asset amortization and earn-out expenses decreased $14.4 million to $0.1 million during the year ended December 31, 2023, compared to $14.4 million during the year ended December 31, 2022.
Intangible Asset Amortization and Earn-out Intangible asset amortization and earn-out expense increased $2.4 million to $2.5 million during the year ended December 31, 2024, compared to $0.1 million during the year ended December 31, 2023.
Net cash used in financing activities during the year ended December 31, 2022, was $9.6 million, primarily consisting of payments of $6.0 million on our term loan and a payment of $5.0 million on the AffloVest earn-out, partially offset by $1.4 million in proceeds from exercises of common stock options and the issuance of common stock under the ESPP.
Net cash used in investing activities during the year ended December 31, 2023, was $2.5 million, primarily consisting of $2.3 million in purchases of property and equipment primarily related to production tooling and office equipment and $0.2 million related to the acquisition of patents and other intangible assets. 79 Table of Contents Net Cash (Used in) Provided by Financing Activities Net cash used in financing activities during the year ended December 31, 2024, was $4.8 million, primarily consisting of payments of $3.5 million for the repurchase of our common stock and payments of $3.0 million on our term loan, partially offset by $1.7 million in proceeds from the issuance of common stock under our Employee Stock Purchase Plan (the “ESPP”).
The increase in revenue was attributable to an increase of $29.5 million, or 14%, in sales and rentals of the lymphedema product line, partially offset by a decrease of $1.8 million, or 5%, in sales of the airway clearance product line in the year ended December 31, 2023, compared to the year ended December 31, 2022. The increase in the lymphedema product line revenue in the year ended December 31, 2023, was attributable to increasing productivity of our field sales team and enhancing our portfolio through the development and introduction of new products.
The increase in revenue was attributable to an increase of $17.6 million, or 7%, in sales and rentals of the lymphedema product line and an increase of $0.9 million, or 3%, in sales of the airway clearance product line in the year ended December 31, 2024, compared to the year ended December 31, 2023. The increase in the lymphedema product line revenue in the year ended December 31, 2024, was attributable to the growth of our field sales team and ongoing technology and workflow initiatives.
The non-cash net income adjustments primarily consisted of $11.9 million change in fair value of earn-out liability, $9.6 million of stock-based compensation expense, and $6.3 million of depreciation and amortization expense.
The positive non-cash net income adjustments consisted primarily of $7.8 million of stock-based compensation expense, $6.8 million of depreciation and amortization expense, $1.1 million of deferred income taxes and $0.3 million of loss on disposal of property and equipment and intangibles.
The decrease in the airway clearance product line revenue in the year ended December 31, 2023, was attributable to one large DME provider experiencing slowed placements of our AffloVest system due to the expiration of the COVID-19 Public Health Emergency (PHE) waiver and a return to “pre-public health emergency” eligibility requirements. Revenue from the Veterans Administration represented 10% of total revenue for each of the years ended December 31, 2023 and 2022.
The increase in the airway clearance product line revenue was primarily attributable to the onboarding of a new DME partner in 2024. 76 Table of Contents Revenue from the Veterans Administration represented 11% and 10% of total revenue for the years ended December 31, 2024 and 2023, respectively.
The decrease was due to a benefit of $2.5 million being recorded for the fair value of the earn-out for the twelve months ended December 31, 2023, as actual revenues for the second year earn-out calculation were lower than the estimated 2023 revenues that were used in forecasting the earn-out liability at December 31, 2022.
The increase was related to there being no earn-out expense in the twelve months ended December 31, 2024, as final payment under the AffloVest acquisition earn-out arrangement was made on November 28, 2023, and therefore there was no change in fair value of an earn-out expense recorded in the twelve months ended December 31, 2024, compared to a decrease in the fair value of the earn-out expense of $2.5 million for the twelve months ended December 31, 2023, due to the lower than expected airway clearance product revenue.
Based on this evaluation, as of December 31, 2023, we reduced the valuation allowance related to the future realization of deferred tax assets, in part because in the current year we achieved three years of cumulative pretax income in the U.S. federal tax jurisdiction, and therefore management determined that there was sufficient positive evidence to conclude that it is more likely than not that additional deferred taxes of $19.4 million are realizable.
The primary driver of the change was the fact that we did not have a release of a valuation allowance on our deferred tax assets for 2024, while in 2023 there was a release of a valuation allowance to recognize the full value of our deferred tax assets because there was sufficient positive evidence to conclude that it was more likely than not that additional deferred taxes were realizable.