The Term Loan was interest-only through September 30, 2023, which could be extended through September 30, 2025 at our option if we completed our IPO on or prior September 30, 2023. In connection with closing the IPO, we extended the interest-only period to September 30, 2025.
The Term Loan was interest-only through September 30, 2023, which could be extended through September 30, 2025 at our option if we completed our IPO on or prior to September 30, 2023. In connection with closing the IPO, we extended the interest-only period to September 30, 2025.
By continuously monitoring the brain’s electrical activity, recognizing patient-specific abnormal electrical patterns, and responding in real time with imperceptible electrical pulses to prevent seizures, our RNS System delivers the precise amount of therapy when and where it is needed and provides exceptional clinical outcomes with approximately three minutes of stimulation on average per day.
By continuously monitoring and analyzing the brain’s electrical activity, recognizing patient-specific abnormal electrical patterns, and responding in real time with imperceptible electrical pulses to prevent seizures, our RNS System delivers the precise amount of therapy when and where it is needed and provides exceptional clinical outcomes with approximately three minutes of stimulation on average per day.
Overhead costs include the cost of quality assurance, testing, material procurement, inventory control, operations supervision and management personnel, an allocation of facilities and information technology expenses, including rent and utilities, and equipment depreciation. Cost of goods sold also includes certain direct costs such as those incurred for shipping our RNS System.
Overhead costs include the cost of quality assurance, testing, material procurement, inventory control, operations supervision and management personnel, an allocation of facilities and information technology expenses, including rent and utilities, and 105 equipment depreciation. Cost of goods sold also includes certain direct costs such as those incurred for shipping our RNS System.
We expense sales variable compensation when revenue related to the underlying sale is recognized. Selling, general and administrative expenses also include costs attributable to professional fees for legal, accounting and tax services, insurance and recruiting fees. 106 We intend to continue to increase our sales and marketing spending to support increased adoption of our RNS System.
We expense sales variable compensation when revenue related to the underlying sale is recognized. Selling, general and administrative expenses also include costs attributable to professional fees for legal, accounting and tax services, insurance and recruiting fees. We intend to continue to increase our sales and marketing spending to support increased adoption of our RNS System.
In addition to competing for market share, we also compete against these companies for personnel, including qualified sales and other personnel that are necessary to grow our business. Leveraging Our Manufacturing Capacity to Further Improve Our Gross Margin With our current operating model and infrastructure, we believe that we have the capacity to significantly increase our manufacturing production.
In addition to competing for market share, we also compete against these companies for personnel, including qualified sales and other personnel that are necessary to grow our business. 104 Leveraging Our Manufacturing Capacity to Further Improve Our Gross Margin With our current operating model and infrastructure, we believe that we have the capacity to significantly increase our manufacturing production.
The non-cash charges primarily consisted of $8.3 million of stock-based compensation, $2.7 million of amortization of right-of-use assets, $1.9 million of interest incurred but paid-in-kind, $0.9 million of non-cash interest expense related to our term loan and $0.4 million of realized loss from sale of short-term investments.
The non-cash charges primarily consisted of $8.3 million of stock-based compensation, $2.7 million of amortization of right-of-use assets, $1.9 million of interest 110 incurred but paid-in-kind, $0.9 million of non-cash interest expense related to our Term Loan and $0.4 million of realized loss from sale of short-term investments.
Upon completion of initial training, our personnel typically require time in the field to grow their network of accounts, build relationships with clinicians and increase their productivity to the levels we expect. We believe successfully training, developing and retaining our Therapy Consultants and Field Clinical Engineers will be required to achieve 104 growth.
Upon completion of initial training, our personnel typically require time in the field to grow their network of accounts, build relationships with clinicians and increase their productivity to the levels we expect. We believe successfully training, developing and retaining our Therapy Consultants and Field Clinical Engineers will be required to achieve growth.
Our gross margin may increase over the long term to the extent our production volume increases as our fixed manufacturing costs would be spread over a larger number of units, thereby reducing our per-unit manufacturing costs. We expect our gross margin to fluctuate from period to period, however, based upon the factors described above.
Our gross margin may increase over the long term to the extent our production volume increases as our fixed manufacturing costs would be spread over a larger number of units, thereby reducing our per-unit manufacturing costs. We expect our gross margin will fluctuate from period to period, however, based upon the factors described above.
As a result, our financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to public companies, which may make comparison of our financials to those of other public companies more difficult.
As a result, our financial statements 111 may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards that are applicable to public companies, which may make comparison of our financials to those of other public companies more difficult.
Cost of Goods Sold and Gross Margin Cost of goods sold consists primarily of costs related to materials, components and subassemblies, personnel-related expenses for our manufacturing and quality assurance employees, including stock-based compensation, manufacturing overhead, charges for excess, obsolete and non-sellable inventories, and royalties.
Cost of Goods Sold and Gross Margin Cost of goods sold consists primarily of costs related to materials, components and subassemblies, personnel-related expenses for our manufacturing and quality assurance employees, including stock-based compensation, manufacturing overhead and charges for excess, obsolete and non-sellable inventories.
If we do raise additional capital through public or private equity or convertible debt offerings, the ownership interest of our existing stockholders will be diluted, and the terms of these securities may adversely affect our stockholders’ rights.
If we raise additional capital through public or private equity or convertible debt offerings, the ownership interest of our existing stockholders will be diluted, and the terms of these securities may adversely affect our stockholders’ rights.
We expect our research and development expenses to increase in absolute dollars as we continue to develop new product offerings and product enhancements and conduct studies for expanded indications for use.
We expect our research and development expenses will increase in absolute dollars as we continue to develop new product offerings and product enhancements and conduct studies for expanded indications for use.
The loan agreement contains customary representations and warranties, covenants, events of default and termination provisions. The financial covenants require that we achieve minimum annual revenue thresholds commencing in 2021 and maintain a minimum balance of cash and cash equivalents. See Notes 6 and 14 to our financial statements included elsewhere in this Annual Report on Form 10-K for additional information.
The loan agreement contains customary representations and warranties, covenants, events of default and termination provisions. The financial covenants require that we achieve minimum annual revenue thresholds commencing in 2021 and maintain a minimum balance of cash and cash equivalents. See Notes 1 and 6 to our financial statements included elsewhere in this Annual Report on Form 10-K for additional information.
If we are unable to raise capital when needed, we will need to delay, limit, reduce or terminate planned commercialization or 110 product development activities in order to reduce costs.
If we are unable to raise capital when needed, we will need to delay, limit, reduce or terminate planned commercialization or product development activities in order to reduce costs.
Overview We are a commercial-stage medical device company focused on transforming the lives of people living with epilepsy by reducing or eliminating the occurrence of debilitating seizures. Our novel and differentiated RNS System is the first and only commercially available, brain-responsive neuromodulation system that delivers personalized, real-time treatment at the seizure source.
Overview We are a medical device company focused on transforming the lives of people living with epilepsy by reducing or eliminating the occurrence of debilitating seizures. Our novel and differentiated RNS System is the first and only commercially available, brain-responsive neuromodulation system that delivers personalized, real-time treatment at the seizure source.
The increase in revenue was primarily due to an increase in the number of units sold for initial implant procedures as well as an increase in pricing, and the addition of sales of DIXI Medical products which began in the fourth quarter of 2022, partially offset by a decrease in units sold for replacement implant procedures in the year ended December 31, 2022 as compared to the year ended December 31, 2021.
The increase in revenue was primarily due to an increase in the number of units sold for initial implant procedures as well as an increase in pricing, and the addition of sales of DIXI Medical products which began in the fourth quarter of 2022, partially offset by a decrease in units sold for replacement implant procedures in the year ended December 31, 2023 as compared to the year ended December 31, 2022.
Our future funding requirements will depend on many factors, including: • the costs of activities related to commercializing and marketing our RNS System in the United States and elsewhere, and manufacturing and distribution costs; • the research and development activities we intend to undertake, including product enhancements and clinical studies for indication expansions that we intend to pursue; • the impact of the COVID-19 pandemic on our business; • the cost of obtaining, maintaining, defending, enforcing, and protecting any patents and other intellectual property rights; • whether or not we pursue acquisitions or investments in businesses, products or technologies that are complementary to our current business; • the degree and rate of increased market acceptance of our RNS System in the United States and market acceptance elsewhere; • our revenue and cost projections related to the DIXI Medical distribution agreement • our need to implement additional infrastructure and internal systems; • our ability to hire additional personnel to support our operations as a public company; and • the emergence of competing technologies or other adverse market developments.
Our future funding requirements will depend on many factors, including: • the costs of activities related to commercializing and marketing our RNS System in the United States and elsewhere, and manufacturing and distribution costs; • the research and development activities we intend to undertake, including product enhancements and clinical studies for indication expansions that we intend to pursue; • the cost of obtaining, maintaining, defending, enforcing, and protecting any patents and other intellectual property rights; • whether or not we pursue acquisitions or investments in businesses, products or technologies that are complementary to our current business; 109 • the degree and rate of increased market acceptance of our RNS System in the United States and market acceptance elsewhere; • our revenue and cost projections related to the DIXI Medical distribution agreement; • our need to implement additional infrastructure and internal systems; • our ability to hire additional personnel to support our operations as a public company; and • the emergence of competing technologies or other adverse market developments.
We have also made significant investments in building our field commercial team and intend to make significant investments in sales and marketing efforts in the future, including initiatives to drive awareness and expand our referral channel to increase the number of drug-resistant epilepsy patients referred to Level 4 CECs.
We have also made significant investments in building our field commercial team and intend to make significant investments in sales and marketing efforts in the future, including initiatives to drive awareness and expand our referral channel to increase the number of drug-resistant epilepsy patients referred to CECs.
As of December 31, 2022, commercial payors have written positive coverage policies that address over 200 million covered lives in the United States. Medicare and Medicaid also routinely provide coverage for implantation of our RNS System and follow-up care.
As of December 31, 2023, commercial payors have written positive coverage policies that address over 200 million covered lives in the United States. Medicare and Medicaid also routinely provide coverage for implantation of our RNS System and follow-up care.
In addition, a change in procedure mix between initial and replacement procedures may have a negative impact on our gross margin. Beginning in the fourth quarter of 2022, we also derive revenue from sales of DIXI Medical products.
In addition, a change in procedure mix between initial and replacement procedures may have a negative impact on our gross margin. Beginning in the fourth quarter of 2022, we also began to derive revenue from sales of DIXI Medical products.
While most drug-resistant epilepsy patients begin their care at physician offices or community hospitals, we estimate that approximately 24,000 adult drug-resistant focal epilepsy patients are treated in CECs in the United States each year.
While most drug-resistant epilepsy patients begin their care at physician offices or community hospitals, we estimate that approximately 24,000 adult drug-resistant focal epilepsy patients are treated in Level 4 CECs in the United States each year.
Beginning in the fourth quarter of 2022, we also derive revenue from sales of DIXI Medical products, primarily to our current customer base. Our revenue from the sale of DIXI Medical products will fluctuate in the future due to a variety of factors, including our ability to take market share from competitive SEEG products.
Beginning in the fourth quarter of 2022, we also derive revenue from sales of DIXI Medical products, primarily to our current customer base. Our revenue from the sale of DIXI Medical products will fluctuate in the future due to a variety of factors, including our ability to take market share from competitive Stereo EEG products.
Our revenue also fluctuates and in the future will continue to fluctuate from quarter-to-quarter due to a variety of factors, including the success of our sales force in expanding adoption of our RNS System in new accounts and the number of physicians who are aware of and prescribe our RNS System.
Our revenue also has fluctuated and in the future will continue to fluctuate from quarter-to-quarter due to a variety of factors, including the success of our sales force in expanding adoption of our RNS System in new accounts and the number of physicians who are aware of and prescribe our RNS System.
As of December 31, 2022, over 4,000 epilepsy patients have received our RNS System. We believe our compelling body of long-term clinical data, demonstrating continuous improvement in outcomes over time, will support the continued adoption of our RNS System among the approximately 575,000 adults in the United States with drug-resistant focal epilepsy.
As of December 31, 2023, over 5,000 epilepsy patients have received our RNS System. We believe our compelling body of long-term clinical data, demonstrating continuous improvement in outcomes over time, will support the continued adoption of our RNS System among the approximately 575,000 adults in the United States with drug-resistant focal epilepsy.
DIXI Distribution Agreement In August 2022, we entered into an exclusive distribution agreement, or the Distribution Agreement, with DIXI Medical USA Corp., or DIXI Medical, pursuant to which we became the exclusive U.S. distributor of DIXI Medical’s product line beginning in October 2022.
Collaborations and Partnerships DIXI Distribution Agreement In August 2022, we entered into an exclusive distribution agreement, or the Distribution Agreement, with DIXI Medical USA Corp., or DIXI Medical, pursuant to which we became the exclusive U.S. distributor of DIXI Medical’s product line beginning in October 2022.
In addition to providing us with an incremental revenue stream, the DIXI Medical partnership will provide us with improved visibility of patients moving through the EMUs, many of whom may be candidates for our RNS System.
In addition to providing us with an incremental revenue stream, the DIXI Medical 103 partnership provides us with improved visibility of patients moving through the EMUs, many of whom may be candidates for our RNS System.
Additionally, we may incur increased expenses related to audit, legal, regulatory and tax-related services associated with being a public company, compliance with exchange listing and Securities and Exchange Commission, or SEC, requirements, and director and officer insurance premiums. Our selling, general and administrative expenses may fluctuate from period to period as we continue to grow.
Additionally, we may incur increased expenses related to audit, legal, regulatory and tax-related services, compliance with exchange listing and Securities and Exchange Commission, or SEC, requirements, and director and officer insurance premiums. Our selling, general and administrative expenses may fluctuate from period to period as we continue to grow.
We market our RNS System in the United States through a direct sales organization primarily to the epileptologists and neurosurgeons who respectively prescribe and implant neuromodulation devices in the approximately 200 CECs in the United States. We have established a significant account base at these CECs.
We have historically marketed our RNS System in the United States through a direct sales organization primarily to the epileptologists and neurosurgeons who respectively prescribe and implant neuromodulation devices in the approximately 200 Level 4 CECs in the United States. We have established a significant account base at these CECs.
This device has an average battery life of nearly eleven years, an increase from the previous model of the device. We expect that our revenue from replacement procedures will decrease over the next few years as a result of the extended replacement cycle of the newer device.
This device has an average battery life of nearly eleven years, an increase from the previous model of the device. We expect that the percentage of our revenue from replacement procedures may continue to decrease over the next few years as a result of the extended replacement cycle of the newer device.
Based on our current planned operations, we expect that our cash, cash equivalents and short-term marketable debt securities will enable us to fund our operating expenses for at least 12 months from the issuance of our financial statements as of and for the year ended December 31, 2022.
Based on our current planned operations, we expect that our cash, cash equivalents and short-term investments will enable us to fund our operating expenses for at least 12 months from the issuance of our financial statements as of and for the year ended December 31, 2023.
We also intend to continue supporting patient and referring clinician outreach efforts to help increase the number of appropriate patients with drug-resistant epilepsy being treated at CECs. These efforts require significant investment by our marketing and sales organization.
We also intend to continue supporting patient and referring clinician outreach efforts to help increase the number of appropriate patients with drug-resistant epilepsy being treated at CECs, including by way of our expansion into the community setting. These efforts require significant investment by our marketing and sales organization.
We estimate that this patient pool represents an annual core market opportunity of approximately $1.1 billion for initial RNS System implants, and we expect that it will continue to grow as the number of CECs and the number of epileptologists increase, as more patients are referred to these CECs, and as more care for RNS-implanted patients can happen outside of the CECs.
We estimate that this patient pool represents an annual core market opportunity of approximately $1.1 billion for initial RNS System implants, and we expect that it will continue to grow as the number of Level 4 CECs and epileptologists increase, and as more patients are referred to these CECs.
Interest Expense and Income Interest expense consists primarily of interest expense related to our term loan facility, including amortization of debt discount and issuance costs. Interest income is predominantly derived from investing surplus cash in money market funds and short-term marketable debt securities.
Interest Expense and Income Interest expense consists primarily of interest expense related to our term loan facility, including amortization of debt discount and issuance costs. Interest income is predominantly derived from investing surplus cash in money market funds and short-term marketable securities. 106 Other Income (Expense), Net Other income (expense), net primarily consists of gain and loss from short-term investments.
We will cease to be an emerging growth company on the date that is the earliest of (i) the last day of the fiscal year in which we have total annual gross revenues of $1.07 billion or more, (ii) the last day of our fiscal year following the fifth anniversary of the date of the closing of our IPO, (iii) the date on which we have issued more than $1.0 billion in nonconvertible debt during the previous three years or (iv) the date on which we are deemed to be a large accelerated filer under the rules of the Securities and Exchange Commission.
We will cease to be an emerging growth company on the date that is the earliest of (i) December 31, 2026, (ii) the last day of the fiscal year in which we have total annual gross revenues of $1.235 billion or more, (iii) the date on which we have issued more than $1.0 billion in nonconvertible debt during the previous three years, or (iv) the date on which we are deemed to be a large accelerated filer under the rules of the Securities and Exchange Commission.
We expect our sales and marketing expenses will increase in absolute dollars as we hire additional personnel and add programs in order to more fully penetrate the market opportunity. We expect our administrative expenses, including stock-based compensation expense, will increase as we increase our headcount and expand our systems to support our operations as a public company.
We expect our sales and marketing expenses will increase in absolute dollars as we hire additional personnel and add programs in order to more fully penetrate the market opportunity. We expect our administrative expenses, including stock-based compensation expense, will increase as we increase our headcount to support our growth.
From January 2021 through June 2025, we have the option to pay interest as follows: 7.5% per annum paid in cash and 5.0% per annum PIK by increasing the principal of the loan. For each payment date from April 2022 through December 2022, we elected the PIK option, increasing the principal of the Term Loan by $1.9 million.
From January 2023 through June 2025, we have the option to pay interest as follows: 8.5% per annum in cash and 5.0% per annum PIK by increasing the principal of the Term Loan. For each payment date from April 2022 through December 2023, we elected the PIK option, increasing the principal of the Term Loan by $4.6 million.
Cash used in operating activities was primarily a result of the net loss of $47.1 million, adjusted for non-cash charges of $15.0 million and change in operating assets and liabilities of $4.8 million.
Net cash used in operating activities was $36.9 million for the year ended December 31, 2022. Cash used in operating activities was primarily a result of the net loss of $47.1 million, adjusted for non-cash charges of $15.0 million and change in operating assets and liabilities of $4.8 million.
This synergistic partnership leverages our field organization that is already calling on the same customers and supports our objective to engage earlier in the diagnostic and therapy selection process. DIXI Medical will supply us with ongoing commercial support and will supply us with DIXI Medical products as ordered by us.
This synergistic partnership leverages our field organization that is already calling on the same customers and supports our objective to engage earlier in the diagnostic and therapy selection process. DIXI Medical provides us with ongoing commercial support and supplies the DIXI Medical products we order.
Interest Expense and Income Interest expense increased by $0.1 million for the year ended December 31, 2022 compared to the year ended December 31, 2021 due to an increase in average balances of our Term Loan as a result of using the paid-in-kind option for interest whereby we added part of the interest due to the Term Loan's principal balance instead of paying it in cash for the payment dates on June 30, 2022, September 30, 2022 and December 31, 2022.
Interest Expense and Income Interest expense increased by $1.0 million for the year ended December 31, 2023, compared to the year ended December 31, 2022, due to an increase in average balances of our Term Loan as a result of using the paid-in-kind option for interest whereby we added part of the interest due to the Term Loan's principal balance instead of paying it in cash for the payment dates from April 2022 through December 2023, and to an increase in the Term Loan interest rate from 12.5% to 13.5% during the year ended December 31, 2023.
Since our inception, we have generated significant losses. To date, we have financed our operations primarily through the sale of equity securities, debt financing arrangements and sales of our products.
Since our inception, we have generated significant losses. We have financed our operations primarily through sales of our products, issuance of equity securities, and debt financing.
Interest income increased by $1.1 million for the year ended December 31, 2022 compared to the year ended December 31, 2021, primarily due to an increase in average balances of our money market funds and short-term marketable debt securities and higher interest yields in the year ended December 31, 2022.
Interest income increased by $1.5 million for the year ended December 31, 2023, compared to the year ended December 31, 2022, primarily due to higher interest yields in the year ended December 31, 2023, partially offset by a decrease in average balances of our money market funds and short-term marketable securities.
Our ability to raise additional capital may be adversely impacted by global economic conditions and the recent disruptions to, and volatility in, the financial markets in the United States and worldwide.
Our ability to raise additional capital may be adversely impacted by global economic conditions and disruptions to, and volatility in, the financial markets in the United States and worldwide, as well as those more specifically impacting our industry.
If our estimate of future demand is too high, we may have to write-down excess inventory for the product and record a charge to cost of goods sold, which could have a material adverse effect on our results of operations.
If our estimate of future demand is too high, we may have to write-down excess inventory for the product and record a charge to cost of goods sold, which could have a material adverse effect on our results of operations. Inventory write-downs were $0.2 million and $0.2 million for the years ended December 31, 2023 and December 31, 2022, respectively.
Cash Flows Provided by (Used in) Investing Activities Net cash provided by investing activities was $23.8 million for the year ended December 31, 2022, which primarily consisted of sales of marketable debt securities of $24.4 million, which amounts were partially offset by purchases of property and equipment of $0.6 million.
Net cash provided by investing activities was $23.8 million for the year ended December 31, 2022, which primarily consisted of sales of short-term investments of $24.4 million, partially offset by purchases of property and equipment of $0.6 million.
Cost of Goods Sold and Gross Margin Cost of goods sold increased by $1.3 million, or 11%, to $13.0 million during the year ended December 31, 2022, compared to $11.7 million during the year ended December 31, 2021.
Cost of Goods Sold and Gross Margin Cost of goods sold increased by $4.3 million, or 33%, to $17.3 million during the year ended December 31, 2023, compared to $13.0 million during the year ended December 31, 2022.
Summary Statements of Cash Flows The following table sets forth the primary sources and uses of cash and cash equivalents for the periods presented below (in thousands): Year Ended December 31, 2022 2021 Net cash provided by (used in): Operating activities $ (36,869) $ (24,577) Investing activities 23,797 (85,396) Financing activities 490 102,526 Net (decrease) increase in cash and cash equivalents $ (12,582) $ (7,447) Cash Flows Used in Operating Activities Net cash used in operating activities was $36.9 million for the year ended December 31, 2022.
Summary Statements of Cash Flows The following table sets forth the primary sources and uses of cash and cash equivalents for the periods presented below (in thousands): Year Ended December 31, 2023 2022 Net cash provided by (used in): Operating activities $ (19,701) $ (36,869) Investing activities 23,027 23,797 Financing activities 8,127 490 Net increase (decrease) in cash and cash equivalents $ 11,453 $ (12,582) Cash Flows Used in Operating Activities Net cash used in operating activities was $19.7 million for the year ended December 31, 2023.
Net cash used in investing activities was $85.4 million for the year ended December 31, 2021, which consisted of purchases of marketable debt securities of $85.0 million and purchases of property and equipment of $0.4 million. 111 Cash Flows Provided by Financing Activities Net cash provided by financing activities was $0.5 million for the year ended December 31, 2022, which primarily relates to receipt of proceeds from the issuance of common stock under employee plans of $0.9 million, partially offset by payment of deferred offering costs of $0.4 million.
Net cash provided by financing activities was $0.5 million for the year ended December 31, 2022, which primarily relates to receipt of proceeds from the issuance of common stock under employee plans of $0.9 million, partially offset by payment of deferred offering costs of $0.4 million.
Cash used in operating activities was primarily a result of the net loss of $36.1 million, adjusted for non-cash charges of $11.1 million and change in operating assets and liabilities of $0.4 million.
Cash used in operating activities was primarily a result of the net loss of $33.0 million, adjusted for non-cash charges of $15.7 million and change in operating assets and liabilities of $2.5 million.
A change in product mix between sales of our RNS System and DIXI Medical products may have a negative impact on our gross margin. Components of Our Results of Operations Revenue We derive most of our revenue from sales of our RNS System to hospital facilities (typically Level 4 CECs) that implant our RNS System.
A change in product mix between sales of our RNS System and DIXI Medical products would cause variability in our gross margin. Components of Our Results of Operations Revenue We derive most of our revenue from sales of our RNS System to hospital facilities that implant our RNS System.
The increase in accrued liabilities and accounts payable was primarily the result of the timing of payments to our vendors.
The increase in prepaid expenses and other assets and accounts payable was primarily the result of the timing of payments to our vendors.
We paid $1.0 million in fees to the lender and third parties which is reflected as a discount on the loan and is being accreted over the life of the loan using the effective interest method.
We paid $1.0 million in fees to the lender and third parties which is reflected as a discount on the loan and is being accreted over the life of the loan using the effective interest method. Future Funding Requirements We expect to incur continued expenditures in the future in support of our commercialization efforts in the United States.
As of December 31, 2022, we had cash, cash equivalents and short-term marketable debt securities of $77.4 million, compared to $115.6 million at December 31, 2021, and $52.9 million outstanding under the Term Loan, net of debt discount and issuance costs, compared to $49.8 million at December 31, 2021.
As of December 31, 2023, we had cash, cash equivalents and short-term investments of $66.5 million, compared to $77.4 million at December 31, 2022, and $57.0 million outstanding under the Term Loan, net of debt discount and issuance costs, compared to $52.9 million at December 31, 2022.
Our gross margin decreased from 74.0% for the year ended December 31, 2021 to 71.4% for the year ended December 31, 2022 primarily due to higher fixed costs per unit as a result of the lower production volume, and lower gross margin for distribution of DIXI Medical products as compared to the gross margin for sales of our RNS System.
Our gross margin increased from 71.4% for the year ended December 31, 2022 to 73.6% for the year ended December 31, 2023 primarily due to lower fixed costs per unit as a result of increased production volume of the RNS System, partially offset by the lower gross margin from distribution of DIXI Medical products.
Research and Development Expenses Research and development expenses increased by $3.7 million, or 21%, to $21.9 million during the year ended December 31, 2022, compared to $18.2 million during the year ended December 31, 2021.
Research and Development Expenses Research and development expenses decreased by $1.2 million, or 5%, to $20.8 million during the year ended December 31, 2023, compared to $21.9 million during the year ended December 31, 2022.
We received Premarket Approval, or PMA, from the FDA for our RNS System in late 2013 and began the commercial rollout of our RNS System in early 2014.
We may additionally seek to expand our operations to reach the approximately 16.5 million drug-resistant epilepsy patients globally. We received Premarket Approval, or PMA, from the FDA for our RNS System in late 2013 and began the commercial rollout of our RNS System in early 2014.
Future Funding Requirements We expect to incur continued expenditures in the future in support of our commercialization efforts in the United States. In addition, we intend to continue to make investments in clinical studies, development of new products, and other ongoing research and development programs.
In addition, we intend to continue to make investments in clinical studies, development of new products, and other ongoing research and development programs. We may incur additional expenses to expand our commercial organization to support our continued growth.
Given the concentrated and underpenetrated nature of our target market, we believe that through our sales force, there is a significant opportunity to efficiently drive higher utilization within these centers, grow our account base, and expand our referral channel to increase the number of drug-resistant patients referred to the CECs. 102 The implant procedure for our RNS System and the ongoing patient treatment provided by clinicians, including monitoring and programming, are reimbursed under well-established physician and hospital codes.
Given the concentrated and underpenetrated nature of our target market, we believe that there is a significant opportunity to efficiently drive higher adoption and utilization within these centers, grow our account base, and expand our referral channel to increase the number of drug-resistant patients referred to Level 4 CECs.
We believe our existing cash, cash equivalents and short-term investments will allow us to continue our operations for at least the next 12 months. Recent Developments COVID-19 Pandemic Update Our business, financial condition and results of operations have been and may continue to be significantly impacted by the COVID-19 pandemic.
We believe our existing cash, cash equivalents and short-term investments will allow us to continue our operations for at least the next 12 months.
In September 2020, we entered into the Term Loan for total borrowings of up to $60.0 million and borrowed $50.0 million.
In September 2020, we entered into the Term Loan for total borrowings of up to $60.0 million and borrowed $50.0 million. In April 2021, we completed our IPO and received $105.5 million in net proceeds after deducting underwriting discounts and commissions and offering costs.
We cannot predict if investors will find our common shares less attractive because we may rely on these exemptions.
We cannot predict if investors will find our common shares less attractive because we may rely on these exemptions. If some investors find our common shares less attractive as a result, there may be a less active trading market for our common shares and our share price may be more volatile.
Net cash provided by financing activities was $102.5 million for the year ended December 31, 2021, which primarily relates to receipt of proceeds from our IPO of $109.1 million and proceeds from issuance of common stock under the employee stock purchase plan of $0.9 million, partially offset by payment of deferred offering costs of $3.4 million and repayment of debt obligations of $4.1 million under the PPP Loan.
Cash Flows Provided by Financing Activities Net cash provided by financing activities was $8.1 million for the year ended December 31, 2023, which primarily consisted of $7.9 million of net cash proceeds from our At-the-Market offering and proceeds from the issuance of common stock under employee plans of $0.8 million, partially offset by taxes withheld and paid related to net share settlement of equity awards of $0.3 million and payment of deferred offering costs of $0.3 million.
The revenue-based milestone was not met, and the remaining $10.0 million of the Term Loan expired without being drawn. The borrowings under the Term Loan are secured by substantially all of our properties, rights and assets, including intellectual property. The Term Loan bears interest at a rate of 12.5% per year.
The revenue-based milestone was not met, and the remaining $10.0 million of the Term Loan expired without being drawn. 108 The Term Loan bears interest at a rate of 13.5% per year. Payments under the loan are made quarterly with payment dates fixed at the end of each calendar quarter.
If some investors find our common shares less attractive as a result, there may be a less active trading market for our common shares and our share price may be more volatile. 112 Recent Accounting Pronouncements See “Recent Accounting Pronouncements” in Note 2 to our financial statements included elsewhere in this Annual Report on Form 10-K for additional information.
Recent Accounting Pronouncements See “Recent Accounting Pronouncements” in Note 2 to our financial statements included elsewhere in this Annual Report on Form 10-K for additional information.
Results of Operations Comparison of the Years Ended December 31, 2022 and 2021 The following table summarizes our results of operations for the periods indicated (in thousands): Years Ended December 31, 2022 2021 Change % Change Revenue $ 45,520 $ 45,183 $ 337 1 % Cost of goods sold 13,027 11,748 1,279 11 % Gross profit 32,493 33,435 (942) (3) % Operating expenses Research and development 21,946 18,211 3,735 21 % Selling, general and administrative 51,341 38,961 12,380 32 % Total operating expenses 73,287 57,172 16,115 28 % Loss from operations (40,794) (23,737) (17,057) 72 % Interest income 1,578 448 1,130 252 % Interest expense (7,529) (7,410) (119) 2 % Other income (expense), net (337) (5,381) 5,044 (94) % Net loss $ (47,082) $ (36,080) $ (11,002) 30 % Revenue Revenue increased by $0.3 million, or 1%, to $45.5 million during the year ended December 31, 2022, compared to $45.2 million during the year ended December 31, 2021.
Results of Operations Comparison of the Years Ended December 31, 2023 and 2022 The following table summarizes our results of operations for the periods indicated (in thousands): Years Ended December 31, 2023 2022 Change % Change Revenue $ 65,421 $ 45,520 $ 19,901 44 % Cost of goods sold 17,299 13,027 4,272 33 % Gross profit 48,122 32,493 15,629 48 % Operating expenses Research and development 20,778 21,946 (1,168) (5) % Selling, general and administrative 54,518 51,341 3,177 6 % Total operating expenses 75,296 73,287 2,009 3 % Loss from operations (27,174) (40,794) 13,620 (33) % Interest income 3,050 1,578 1,472 93 % Interest expense (8,517) (7,529) (988) 13 % Other income (expense), net (315) (337) 22 (7) % Net loss $ (32,956) $ (47,082) $ 14,126 (30) % Revenue Revenue increased by $19.9 million, or 44%, to $65.4 million during the year ended December 31, 2023, compared to $45.5 million during the year ended December 31, 2022.
In addition, the sale of replacement neuromodulation devices when the battery in our RNS neurostimulator approaches end of service provides a recurring revenue stream that is additive to our current $1.1 billion annual market opportunity for initial implants.
Our RNS System has an estimated average battery life of nearly eleven years, an increase from the previous model of the device. The sale of replacement neuromodulation devices provides a recurring revenue stream that is additive to the annual market opportunity for initial implants.
There is no commitment to purchase our RNS System until the delivery of the product, as the procedure may be canceled at any time. 105 Our revenue fluctuates primarily based on the volume of procedures performed and the procedure mix between initial and replacement implants.
Our revenue fluctuates primarily based on the volume of procedures performed and the procedure mix between initial and replacement implants.
We lease our office and manufacturing facilities in Mountain View, California under a non-cancelable operating lease which expires in June 2030. Future minimum lease payments under non-cancelable operating leases were $23.0 million as of December 31, 2022. See “Facility Lease” in Note 5 to our financial statements included elsewhere in this Annual Report on Form 10-K for additional information.
See “Facility Lease” in Note 5 to our financial statements included elsewhere in this Annual Report on Form 10-K for additional information. As of December 31, 2023, we had cash, cash equivalents and short-term investments of $66.5 million.
We continue seeking indication expansion to, over time, more broadly reach the entire approximately 1.2 million drug-resistant epilepsy patients in the United States and have begun enrollment in clinical studies to broaden our indication including into generalized epilepsy. We may additionally seek to expand our operations to reach the approximately 16.5 million drug-resistant epilepsy patients globally.
We continue seeking indication expansion to, over time, more broadly reach the entire approximately 1.2 million drug-resistant epilepsy patients in the United States. In December 2023, we finished enrolling and implanting the requisite number of patients for FDA submission in our clinical trial to evaluate RNS System use in the generalized epilepsy population.
In November 2022, we filed a Registration Statement on Form S-3, or Shelf, with the SEC in relation to the registration of common stock, preferred stock, debt securities, warrants or any combination thereof for up to an aggregate of $150.0 million, of which $50.0 million may be issued and sold pursuant to an at-the-market, or ATM, offering program for sales of our common stock under a sales agreement, or Sales Agreement, with SVB Securities LLC, or SVB.
In November 2022, we entered into a Sales Agreement with Leerink Partners LLC, or Leerink, to sell shares of our common stock, from time to time, through an at-the-market, or ATM, equity offering program under which Leerink will act as our sales agent and pursuant to which we may sell common stock for aggregate gross sales proceeds of up to $50.0 million.
Selling, General and Administrative Expenses Selling, general and administrative expenses increased by $12.4 million, or 32%, to $51.3 million during the year ended December 31, 2022, compared to $39.0 million during the year ended December 31, 2021.
The decreases were offset in part by an increase of $0.7 million in personnel-related expenses, including stock-based compensation. Selling, General and Administrative Expenses Selling, general and administrative expenses increased by $3.2 million, or 6%, to $54.5 million during the year ended December 31, 2023, compared to $51.3 million during the year ended December 31, 2022.
The change in operating assets and liabilities was due to an increase in prepaid expenses and other assets of $1.2 million primarily due to the timing of payments to our vendors, an increase in inventories of $1.2 million largely due to an increase in finished goods, and a decrease in deferred rent of $0.6 million offset in part by a decrease in accounts receivable of $1.3 million primarily due to more timely payments by our customers, an increase in accrued liabilities of $1.7 million, and an increase in accounts payable of $0.5 million.
The change in operating assets and liabilities was due to an increase in accounts receivable of $4.9 million primarily due to an increase in sales of our products including our RNS System and DIXI Medical products, an increase in inventories of $1.7 million largely due to an increase in raw materials and finished goods partially offset by a reduction in work-in-process inventory, a decrease in operating lease liabilities of $1.4 million due to cash paid for rent net of the accretion of imputed interest, offset in part by a decrease in prepaid expenses and other assets of $0.4 million, an increase in accrued liabilities of $3.8 million primarily due to an increase in accrued employee bonuses and payroll related expenses, and an increase in deferred revenue of $1.1 million related to our collaboration agreement with Rapport Therapeutics.
As of December 31, 2022, we had an accumulated deficit of $470.9 million, cash, cash equivalents and short-term marketable debt securities of $77.4 million, and $52.9 million of outstanding term loans, net of debt discount and issuance costs.
As of December 31, 2023, we had an accumulated deficit of $503.8 million, cash, cash equivalents and short-term investments of $66.5 million, and $57.0 million of outstanding term loans, net of debt discount and issuance costs. We have invested heavily and expect to continue to invest in research and development and commercial activities.
The increases were offset in part by a decrease of $0.3 million in allocated facility and information technology expenses, including rent, utilities and depreciation.
The increases were offset in part by a decrease of $3.1 million in general and administrative costs, primarily outside services and insurance.
The non-cash charges primarily consisted of $5.2 million in change in the fair value of redeemable convertible preferred stock warrant liability, $0.8 million of non-cash interest expense related to our term loans, and $4.3 million of stock-based compensation.
The non-cash charges primarily consisted of $9.6 million of stock-based compensation, $2.7 million of interest incurred but paid-in-kind, $1.4 million of amortization of right-of-use assets, $1.1 million of non-cash interest expense related to our Term Loan, $0.3 million of amortization of debt discount and issuance costs and $0.3 million of loss from short-term investments.
Payments under the loan are made quarterly with payment dates fixed at the end of each calendar quarter. Through December 2020, we had the option to pay the entire interest paid-in-kind, or PIK, by increasing the principal of the Term Loan.
From January 2021 through December 2022, we had the option to pay interest as follows: 7.5% per annum in cash and 5.0% per annum paid-in-kind, or PIK, by increasing the principal of the Term Loan.
The increase was primarily due to cost associated with distribution of DIXI Medical products, as well as to an increase in indirect labor costs including stock-based compensation, partially offset by the decrease in sales volume for replacement procedures in the year ended December 31, 2022.
The increase in selling, general and administrative expenses was primarily due to an increase of $4.9 million in personnel-related expenses driven by an increase in sales-based variable compensation as a result of the increase in revenue during the year ended December 31, 2023, compared to the year ended December 31, 2022, and stock-based compensation, an increase of $0.8 million in sales, field support and marketing costs including expenses for ongoing commercial support provided by DIXI Medical in connection with distributing their products, and an increase of $0.4 million in expenses related to commercial operations.