Biggest changeIncome Tax Expense (Benefit) Because the Company maintains a full valuation allowance against its net deferred tax assets, income tax expense is expected to primarily consist of current federal, state and foreign cash tax expense as a result of taxable income anticipated or incurred in those jurisdictions. 59 Results of Operations Year Ended December 31, (in thousands, except percentages) 2022 2021 2020 Sales: United States $ 588,765 $ 524,907 $ 415,680 Outside the United States 212,452 177,892 83,150 Total sales 801,217 702,799 498,830 Cost of sales 388,231 326,584 238,310 Gross profit 412,986 376,215 260,520 Gross margin 52 % 54 % 52 % Operating expenses: Selling, general and administrative 335,681 261,508 204,903 Research and development 139,114 92,054 63,574 Acquired in-process research and development 31,039 — — Total operating expenses 505,834 353,562 268,477 Operating income (loss) (92,848) 22,653 (7,957) Other income (expense), net: Interest income and other, net 6,057 674 1,567 Interest expense (6,208) (6,040) (12,805) Change in fair value of common stock warrants 147 (1,386) (17,087) Total other expense, net (4) (6,752) (28,325) Income (loss) before income taxes (92,852) 15,901 (36,282) Income tax expense (benefit) 1,742 335 (1,900) Net income (loss) $ (94,594) $ 15,566 $ (34,382) Comparison of Years Ended December 31, 2022 and 2021 Sales .
Biggest changeResults of Operations Year Ended December 31, (in thousands, except percentages) 2023 2022 2021 Sales: United States $ 554,878 $ 588,765 $ 524,907 Outside the United States 192,840 212,452 177,892 Total sales 747,718 801,217 702,799 Cost of sales 380,028 388,231 326,584 Gross profit 367,690 412,986 376,215 Gross margin 49 % 52 % 54 % Operating expenses: Selling, general and administrative 352,503 335,681 261,508 Research and development 169,667 139,114 92,054 Acquired in-process research and development 78,750 31,039 — Total operating expenses 600,920 505,834 353,562 Operating income (loss) (233,230) (92,848) 22,653 Other income (expense), net: Interest income and other, net 22,858 6,057 674 Interest expense (9,882) (6,208) (6,040) Change in fair value of common stock warrants — 147 (1,386) Total other income (expense), net 12,976 (4) (6,752) Income (loss) before income taxes (220,254) (92,852) 15,901 Income tax expense 2,357 1,742 335 Net income (loss) $ (222,611) $ (94,594) $ 15,566 65 Comparison of Years Ended December 31, 2023 and 2022 Sales For the year ended December 31, 2023, sales were $747.7 million, which included $192.8 million of sales outside the United States.
If a customer elects to participate in Tandem Choice at a future date beginning with the launch of our next generation hardware platform, we will recognize the existing deferral, incremental fees received and the associated costs of providing the new hardware at the time of fulfillment. Any remaining deferrals will be recognized at program expiration.
If a customer elects to participate in Tandem Choice at a future date beginning with the launch of our next generation hardware platform, Tandem Mobi, we will recognize the existing deferral, incremental fees received and the associated costs of providing the new hardware, Tandem Mobi, at the time of fulfillment. Any remaining deferrals will be recognized at program expiration.
Seasonality • Seasonality in the United States is associated with annual insurance deductibles and coinsurance requirements of the medical insurance plans used by our customers and the customers of our distributors. In the United States, we experience a higher volume of pump shipments in the third and fourth quarters due to the nature of the reimbursement environment.
Seasonality • Seasonality in the United States is associated with annual insurance deductibles and coinsurance requirements of the medical insurance plans used by our customers and the customers of our distributors. In the United States, we typically experience a higher volume of pump shipments in the third and fourth quarters due to the nature of the reimbursement environment.
We continually assess the likelihood and amount of potential revisions and adjust the income tax provision, income taxes payable and deferred taxes in the period in which the facts that give rise to a revision become known. 68
We continually assess the likelihood and amount of potential revisions and adjust the income tax provision, income taxes payable and deferred taxes in the period in which the facts that give rise to a revision become known.
At the end of the typical four-year reimbursement cycle, customers may be eligible for the purchase of a new insulin pump, subject to the rules and requirements of their primary insurance payor.
At the end of the typical four-year reimbursement cycle, customers may be eligible to purchase a new insulin pump, subject to the rules and requirements of their primary insurance payor.
For a description of our contractual obligations related to leases at December 31, 2022, see Note 6 “Leases” to the consolidated financial statements in Part II, Item 8 of this Annual Report. Purchase Order Commitments We have agreements with suppliers and other parties to purchase inventory, other goods and services and long-lived assets.
For a description of our contractual obligations related to leases at December 31, 2023, see Note 6 “Leases” to the consolidated financial statements in Part II, Item 8 of this Annual Report. Purchase Order Commitments We have agreements with suppliers and other parties to purchase inventory, other goods and services and long-lived assets.
The reduction in net cash provided by operating activities for 2022 compared to 2021 was primarily a result of the $110.2 million increase in net loss, as well as net working capital changes. Working capital changes during 2022, primarily consisted of increases in inventories, accounts receivable, accounts payable, and operating leases and other current liabilities.
The reduction in net cash provided by operating activities for 2022 compared to 2021 was primarily a result of the $110.2 million increase in net loss, as well as net working capital changes. Working capital changes during 2022, primarily consisted of increases in inventories, accounts receivable, accounts payable, and operating leases and other current liabilities. 68 Investing activities .
Experience has shown that initial data for any given pump version may be insufficient; therefore, our process relies on long-term historical averages until sufficient data are available. As actual experience becomes available, we use the data to update the historical averages.
Experience has shown that initial data for any given pump version or pump platform may be insufficient; therefore, our process relies on long-term historical averages until sufficient data are available. As actual experience becomes available, we use the data to update the historical averages.
For a description of our contractual obligations related to purchase order commitments at December 31, 2022, see Note 13 “Commitments and Contingencies” to the consolidated financial statements in Part II, Item 8 of this Annual Report.
For a description of our contractual obligations related to purchase order commitments at December 31, 2023, see Note 13 “Commitments and Contingencies” to the consolidated financial statements in Part II, Item 8 of this Annual Report.
Our primary customers are the end customers who use our products, non-exclusive distribution partners whose level of service varies based on geography, the healthcare professionals who prescribe our products and the healthcare systems or payors who provide insurance coverage and access to our products.
Our primary customers are the end users of our products, non-exclusive distribution partners whose level of service varies based on geography, the healthcare professionals who prescribe our products and the healthcare systems or payors who provide insurance coverage and access to our products.
The proceeds from the issuance of the Notes were $244.6 million, net of debt issuance costs and cash used to pay the cost of the Capped Call Transactions (see Note 7, “Debt”). The Notes are senior unsecured obligations. Interest is payable in cash semi-annually in arrears beginning on November 1, 2020 at a rate of 1.50% per year.
The proceeds from the issuance of the Notes were $244.6 million, net of debt issuance costs and cash used to pay the cost of the Capped Call Transactions (see Note 7, “Debt”). The Notes are senior unsecured obligations. Interest is payable in cash semi-annually in arrears on May 1 and November 1 at a rate of 1.50% per year.
At this time, we are not able to estimate the financial impact for the duration of Tandem Choice. Cost of Sales Cost of sales includes raw materials, labor costs, manufacturing overhead expenses, product training costs, royalties, freight, reserves for expected warranty costs, costs of supporting our digital health platforms, scrap and charges for excess and obsolete inventories.
At this time, we are not able to estimate the financial impact for the remainder of the Tandem Choice period. Cost of Sales Cost of sales includes raw materials, labor costs, manufacturing overhead expenses, product training costs, royalties, freight, reserves for expected warranty costs, costs of supporting our digital health platforms, scrap and charges for excess and obsolete inventories.
Based on the 2018 study completed in 2019, we determined that an ownership change, as defined under Section 382, occurred in 2018 and the resulting limitation significantly reduced our ability to utilize our net operating loss and credit carryovers before they expire.
Based on this study, we determined that an ownership change, as defined under Section 382, occurred in 2018 and the resulting limitation significantly reduced our ability to utilize our net operating loss and credit carryovers before they expire.
In particular, our cash inflows and outflows are principally impacted by the following: • our ability to generate sales, the timing of those sales, the mix of products sold and the collection of receivables from period to period; • the timing of any additional financings, and the net proceeds raised from such financings; • the timing and amount of proceeds from the issuance of equity awards pursuant to employee stock plans; • fluctuations in gross margins and operating margins; and • fluctuations in working capital, including changes in accounts receivable, inventories, accounts payable, employee-related liabilities, and operating lease liabilities.
In particular, our cash inflows and outflows are principally impacted by the following: • our ability to generate sales, the timing of those sales, the mix of products sold and the collection of receivables from period to period; • contractual debt obligations, including periodic interest payments; • the timing of any additional financings, and the net proceeds raised from such financings; • the timing and amount of proceeds from the issuance of equity awards pursuant to employee stock plans; • fluctuations in gross margins and operating margins; and • fluctuations in working capital, including changes in accounts receivable, inventories, accounts payable, employee-related liabilities, and operating lease liabilities.
Multiple studies have demonstrated that use of Control-IQ technology provides people across all demographics with improved clinical outcomes that are both immediate and sustained. It was the first system cleared by the U.S. Food and Drug Administration (FDA) to deliver automatic correction boluses in addition to adjusting insulin to help prevent high and low blood sugar.
Multiple studies have demonstrated that use of Control-IQ technology provides people across all demographics with improved clinical outcomes that are both immediate and sustained. It was the first system cleared by the FDA to deliver automatic correction boluses in addition to adjusting insulin to help prevent high and low blood sugar.
Acquisition-related Contingent Consideration In connection with our acquisition of AMF Medical SA completed in January of 2023 (see Note 15, “Subsequent Event” to the consolidated financial statements in Part II, Item 8 of this Annual Report), the total consideration includes cash paid at the closing of the transaction and additional contingent earnout payments.
Acquisition-related Contingent Consideration In connection with our acquisition of AMF Medical SA completed in January of 2023 (see Note 12, “Acquisitions” to the consolidated financial statements in Part II, Item 8 of this Annual Report), the total consideration includes cash paid at the closing of the transaction and additional contingent earnout payments.
Complementary products, such as the t:connect cloud-based data management application and the Tandem Device Updater, are considered distinct performance obligations satisfied over time, as access and support for these products is provided throughout the typical four-year warranty period of the insulin pumps. Accordingly, revenue related to the complementary products is deferred and recognized over a four-year period.
Complementary products, such as the t:connect, Tandem Source and the Tandem Device Updater, are considered distinct performance obligations satisfied over time, as access and support for these products is provided throughout the typical four-year warranty period of the insulin pumps. Accordingly, revenue related to the complementary products is deferred and recognized over a four-year period.
Macroeconomic Factors • Global economic and market uncertainty, such as recessionary concerns, inflation, changes in discretionary spending and increased interest rates have impacted our customers’ purchasing decisions and the buying patterns of our distributors. • The lingering effects of COVID-19 have continued to disrupt our relationship with suppliers, third-party manufacturers, healthcare providers, distributors and our existing or potential customers.
Macroeconomic Factors • Global economic and market uncertainty, such as recessionary concerns, inflation, changes in discretionary spending and increased interest rates have impacted our customers’ purchasing decisions and the buying patterns of our distributors. • High inflation and the effects of other macroeconomic factors and concerns have continued to disrupt our relationships with suppliers, third-party manufacturers, healthcare providers, distributors and our existing or potential customers.
The Notes mature on May 1, 2025 unless repurchased, redeemed, or converted in accordance with their terms prior to the maturity date.
The Notes mature on May 1, 2025 unless repurchased, redeemed, or converted in accordance with their terms before the maturity date.
While warranties generally expire four years from the original pump shipment date, those customers that renew typically purchase a subsequent pump within one year from the date of warranty expiration.
While warranties generally expire four years from the original pump shipment date, those customers that renew typically take up to one year from date of warranty expiration to purchase a subsequent pump.
Our other products include disposable insulin cartridges and infusion sets, as well as our complementary t:connect, TDU and mobile application products.
Our other products include single-use insulin cartridges and infusion sets, as well as our complementary t:connect, TDU and mobile application products.
Both our primary short-term and long-term capital needs are expected to include expenditures related to: • support of our commercialization efforts related to our current and future products; • expansion of our customer support resources for our growing installed customer base; • research and product development efforts, including clinical trial costs; • acquisitions, leasing or licensing of equipment, technology, intellectual property and other assets; • additional facilities leases and related tenant improvements; • investments for the development, improvement and acquisition of manufacturing, testing and packaging equipment to support business growth and increase capacity; and 65 • payments under licensing, development and commercialization agreements. • acquisition and subsequent integration of businesses, products and technologies.
Both our primary short-term and long-term capital needs are expected to include expenditures related to: • support of our commercialization efforts related to our current and future products; • expansion of our customer support resources for our growing installed customer base; • research and product development efforts, including clinical trial costs; • acquisitions, including contingent earnout payments that become payable upon the achievement of certain milestones; • leasing or licensing of equipment, technology, intellectual property and other assets; • additional facilities leases and related tenant improvements; • investments for the development, improvement and acquisition of manufacturing, testing and packaging equipment to support business growth and increase capacity; • payments under licensing, development and commercialization agreements; and 69 • integration costs related to acquisitions of businesses, products and technologies.
Cash payments due by calendar year for our Convertible Senior Notes at December 31, 2022 are as follows (in thousands): Total 2023 2024 2025 Principal amount of convertible senior notes (1) $ 287,500 $ — $ — $ 287,500 Contractual interest 10,782 4,313 4,313 2,156 Total $ 298,282 $ 4,313 $ 4,313 $ 289,656 (1) The Convertible Senior Notes may be settled in cash, shares of our common stock, or a combination of cash and shares of our common stock, at our election.
Cash payments due by calendar year for our Convertible Senior Notes at December 31, 2023, are as follows (in thousands): Total 2024 2025 Principal amount of convertible senior notes (1) $ 287,500 $ — $ 287,500 Contractual interest 6,469 4,313 2,156 Total $ 293,969 $ 4,313 $ 289,656 (1) The Convertible Senior Notes may be settled in cash, shares of our common stock, or a combination of cash and shares of our common stock, at our election.
The promissory note accrues interest at the rate of 5% per year, becomes due and payable upon the first sale or license of the commercialized product, and is included as a component of other long-term liabilities on the consolidated balance sheet at December 31, 2022.
The promissory note accrues interest at the rate of 5% per year, and becomes due and payable upon the first sale or license of the commercialized product. At December 31, 2023, $4.7 million was included as a component of other long-term liabilities on the consolidated balance sheet.
We are experiencing higher costs as we navigate these global supply chain challenges. Components of Results of Operations Sales We offer products for people with insulin-dependent diabetes in approximately 25 countries. The t:slim X2 insulin pump is our flagship pump platform.
We are experiencing higher costs as we navigate these global macroeconomic challenges. 63 Components of Results of Operations Sales We offer products for people with insulin-dependent diabetes in approximately 25 countries. The t:slim X2 insulin pump has been our flagship pump platform.
For the year ended December 31, 2022, sales were $801.2 million, which included $212.5 million of sales outside the United States. For the year ended December 31, 2022, we deferred $3.5 million of pump sales as the result of our Tandem Choice program which launched in the third quarter of 2022.
For the year ended December 31, 2022, sales were $801.2 million, which included $212.5 million of sales outside the United States, and we deferred $3.5 million of pump sales as a result of our Tandem Choice program.
Net cash provided by investing activities was $33.2 million for the year ended December 31, 2022, which was primarily related to $569.5 million in proceeds from maturities and redemptions of short-term investments, offset by $467.7 million of purchases of short-term investments, $34.1 million in purchases of property and equipment, $25.7 million for the acquisition of Capillary Biomedical, including $1.0 million of transaction costs, and $8.9 million cash paid for purchases of intangible assets and strategic investments.
Net cash provided by investing activities was $33.2 million for the year ended December 31, 2022, which primarily consisted of $101.8 million provided by short-term investments activity as proceeds from maturities and redemptions exceeded purchases, offset by $34.1 million in purchases of property and equipment, $25.7 million for the acquisition of Capillary Biomedical, including $1.0 million of transaction costs, and $8.9 million cash paid for purchases of intangible assets and strategic investments.
Insulin pumps returned to us may be refurbished and redeployed. We establish the warranty reserve liability when control of the pump is transferred to the customer, and we reevaluate our estimate of the warranty obligation at each reporting period. Warranty costs are estimated primarily based on the current expected product replacement cost and expected replacement rates utilizing historical experience.
We establish the warranty reserve liability when control of the pump is transferred to the customer, and we reevaluate our estimate of the warranty obligation at each reporting period. Warranty costs are estimated primarily based on the current expected product replacement cost and expected replacement rates utilizing historical experience.
Other factors that may impact sales across the year include the timing of winter, summer and other seasonal holidays, particularly in our markets outside the United States.
Other factors that may impact sales across the year include the timing of winter, summer and other seasonal holidays, particularly in our markets outside the United States, as well as the anticipated launch of new products.
Net cash provided by operating activities was $50.5 million for the year ended December 31, 2022, compared to cash provided of $111.4 million and $24.7 million, respectively, for the years ended December 31, 2021 and 2020.
Net cash used in operating activities was $31.8 million for the year ended December 31, 2023, compared to cash provided by operating activities of $50.5 million and $111.4 million, respectively, for the years ended December 31, 2022 and 2021.
We also experienced a $15.0 million increase in other non-employee discretionary spending, including outside consulting and services, clinical trial expenses, information technology and equipment costs attributable to R&D. Acquired In-Process Research and Development Expenses.
We also experienced a $7.5 million increase in other non-employee discretionary spending, including equipment and supplies costs, clinical trial expenses, and information technology costs attributable to R&D. Acquired In-Process Research and Development Expenses.
The following table shows a summary of our cash flows for the years ended December 31, 2022, 2021 and 2020 (in thousands): Year Ended December 31, 2022 2021 2020 Net cash provided by (used in): Operating activities $ 50,464 $ 111,359 $ 24,669 Investing activities 33,168 (186,876) (296,056) Financing activities 16,877 51,932 314,438 Effect of foreign exchange rate changes on cash 827 153 387 Net increase (decrease) in cash and cash equivalents $ 101,336 $ (23,432) $ 43,438 Operating activities .
The following table shows a summary of our cash flows for the years ended December 31, 2023, 2022 and 2021 (in thousands): Year Ended December 31, 2023 2022 2021 Net cash provided by (used in): Operating activities $ (31,810) $ 50,464 $ 111,359 Investing activities (85,740) 33,168 (186,876) Financing activities 4,113 16,877 51,932 Effect of foreign exchange rate changes on cash (212) 827 153 Net increase (decrease) in cash and cash equivalents $ (113,649) $ 101,336 $ (23,432) Operating activities .
Acquired IPR&D expenses of $31.0 million for the year ended December 30, 2022 represented the value of assets acquired, and acquisition related expenses in connection with our acquisition of Capillary Biomedical (see Note 12, “Acquisitions”). Other Income (Expense) . Total other expense, net for the year ended December 31, 2022 was $4,000, compared to $6.8 million in 2021.
Acquired IPR&D expenses of $31.0 million for the year ended December 31, 2022 represented the value of assets acquired, and acquisition-related expenses in connection with our acquisition of Capillary Biomedical. 67 Other Income (Expense), Net Total other income, net for the year ended December 31, 2023 was $13.0 million, compared to expense of $4,000 in 2022.
Financing activities . Net cash provided by financing activities was $16.9 million for the year ended December 31, 2022, which primarily consisted of proceeds from the issuance of common stock under our stock plans.
Net cash provided by financing activities was $16.9 million and $51.9 million, respectively, for the years ended December 31, 2022 and 2021, which primarily consisted of proceeds from the issuance of common stock under our stock plans, net of payments for related tax withholdings.
The additional earnout payments of up to CHF 129.6 million, in aggregate, become payable upon the achievement of certain milestones and are comprised of a payment of up to CHF 38.4 million upon the successful completion of key development milestones over the next two years, and a payment of up to CHF 91.2 million upon obtaining regulatory clearance of an automated controller enabled (ACE) pump by the United States Food and Drug Administration. 66 Off-Balance Sheet Arrangements As of December 31, 2022, we are a party to certain standby letter of credit arrangements in support of our operating lease obligations.
The additional earnout payments of up to CHF 129.6 million, in aggregate, become payable upon the achievement of certain milestones and are comprised of a payment of up to CHF 38.4 million upon the successful completion of key development milestones over the two years following the acquisition, and a payment of up to CHF 91.2 million upon obtaining regulatory clearance of an automated controller enabled (ACE) pump by the United States Food and Drug Administration. 72 Off-Balance Sheet Arrangements As of December 31, 2023, we are party to a standby letter of credit arrangement in support of certain operating lease obligations (See Note 13 “Commitments and Contingencies” to the consolidated financial statements in Part II, Item 8 of this Annual Report).
Net cash used by investing activities was $186.9 million for the year ended December 31, 2021, which was primarily related to $733.4 million of purchases of short-term investments, $14.2 million in purchases of property and equipment, and $9.3 million cash paid for purchases of intangible assets and strategic investments, offset by $570.0 million in proceeds from maturities and redemptions of short-term investments.
Net cash used by investing activities was $186.9 million for the year ended December 31, 2021, which primarily consisted of $163.4 million used by short-term investments activity as purchases exceeded maturities and redemptions, $14.2 million in purchases of property and equipment, and $9.3 million cash paid for purchases of intangible assets and strategic investments. Financing activities .
This offering is a competitive advantage that allows us to bring our customers clinical and lifestyle enhancements, such as new developments in our AID technology, CGM integrations and mobile app features.
Tandem Mobi offers the same update capability with wireless, remote updates. This offering is a competitive advantage that allows us to bring our customers clinical and lifestyle enhancements, such as new developments in our AID technology, CGM integrations and mobile app features.
Our cost of sales for the year ended December 31, 2022 was $388.2 million, resulting in gross profit of $413.0 million, compared to cost of sales of $326.6 million and gross profit of $376.2 million for the year ended December 31, 2021. The gross margin for 2022 was 52%, compared to 54% in 2021.
Cost of Sales and Gross Profit Our cost of sales for the year ended December 31, 2023 was $380.0 million, resulting in gross profit of $367.7 million, compared to cost of sales of $388.2 million and gross profit of $413.0 million for the year ended December 31, 2022. The gross margin for 2023 was 49%, compared to 52% in 2022.
Net cash provided by financing activities was $51.9 million for the year ended December 31, 2021, which primarily consisted of proceeds from the issuance of common stock under our stock plans.
Net cash provided by financing activities was $4.1 million for the year ended December 31, 2023, which primarily consisted of proceeds from the issuance of common stock under our stock plans, net of payments for related tax withholdings.
Sales of pump-related supplies increased primarily due to a 39% increase in our ending estimated installed base of customers in the United States. Sales to distributors accounted for 67% and 70% of our total sales in the United States for the years ended December 31, 2021 and 2020, respectively.
Sales of pump-related supplies increased primarily due to a 7% year-over-year increase in our ending estimated installed base of customers in the United States. Sales to distributors accounted for 64% and 65% of our total sales in the United States for the years ended December 31, 2023 and 2022, respectively.
We consider the number of insulin pump units shipped to be an important metric for managing our business. 56 Insulin pumps in the markets we serve worldwide are generally subject to a four-year reimbursement cycle, imposed by the third-party insurance carrier, government plan or healthcare system that serves as the primary payor.
Pump Reimbursement Cycle Insulin pumps in the markets we serve worldwide are generally subject to a four-year reimbursement cycle, imposed by the third-party insurance carrier, government plan or healthcare system that serves as the primary payor.
The majority of our customers use the t:slim X2 with continuous glucose monitoring (CGM) integration. This allows the t:slim X2 to receive CGM sensor readings, which can then be used in our automated insulin dosing (AID) algorithms, including our Control-IQ technology. Control-IQ is an advanced hybrid-closed loop feature designed to help increase a user's time in their targeted glycemic range.
This allows their insulin pump to receive CGM sensor readings, which can then be used in our AID algorithms, including our Control-IQ technology. Control-IQ is an advanced hybrid-closed loop feature designed to help increase a user’s time in their targeted glycemic range.
We recognized income tax expense of $1.7 million on a pre-tax loss of $92.9 million for the year ended December 31, 2022, compared to income tax expense of $0.3 million on a pre-tax gain of $15.9 million for the same period in 2021.
Income Tax Expense We recognized income tax expense of $2.4 million on a pre-tax loss of $220.3 million for the year ended December 31, 2023, compared to income tax expense of $1.7 million on a pre-tax loss of $92.9 million for the year ended December 31, 2022.
The t:slim X2 is unique in that it is the only pump on which remote software updates have been made commercially available in the United States. Now available in the countries we serve worldwide, our Tandem Device Updater (TDU) that has allowed approximately 200,000 people to update their t:slim X2 software from a personal computer.
The t:slim X2 was the first pump on which remote software updates were made commercially available in the United States and is now also available in the countries we serve worldwide. Our Tandem Device Updater (TDU) has allowed our t:slim X2 customers to update their pump software from a personal computer.
The majority of our insulin pump sales through the current period have been generated by new customers, but the opportunity for existing customers to purchase a renewal insulin pump increases each period as escalating number of additional customer warranties expire.
While the majority of our insulin pump sales from initial commercialization through the current period have been generated by sales to new customers, the opportunity to make subsequent sales of renewal insulin pumps to existing customers increases each period as an escalating number of customer warranties expire.
We recognize revenue when control of our products is transferred to our customers in an amount that reflects the consideration we expect to receive from our customers in exchange for those products, net of estimated returns.
We are paid directly by customers who use the products, distributors and third-party insurance payors. We recognize revenue when control of our products is transferred to our customers in an amount that reflects the consideration we expect to receive from our customers in exchange for those products, net of estimated returns and rebates.
We believe that our cash and cash equivalents, short-term investments, borrowing availability under the Line of Credit, and future cash flows from operations will be sufficient to fund our ongoing core business activities.
We believe that our cash and cash equivalents, short-term investments, and future cash flows from operations will be sufficient to fund our ongoing core business activities for at least the next 12 months.
Other expense for 2022 primarily consisted of $6.2 million of interest expense which included the amortization of debt issuance costs related to our Convertible Senior Notes, offset by $6.1 million of interest income earned on our cash equivalents and short-term investments.
Other income, net for 2023 primarily consisted of $21.2 million of interest income earned on our cash equivalents and short-term investments, and $1.5 million in foreign currency transaction gains, partially offset by $9.9 million of interest expense which included $3.3 million of additional interest as discussed above and the amortization of debt issuance costs related to our Convertible Senior Notes.
SG&A expenses increased 28% to $335.7 million for the year ended December 31, 2022, from $261.5 million for the same period in 2021. Employee-related expenses for our SG&A functions comprise the majority of SG&A expenses.
In 2023, we also incurred employee severance costs of $2.7 million. Selling, General and Administrative Expenses. SG&A expenses increased 5% to $352.5 million for the year ended December 31, 2023, from $335.7 million for the same period in 2022. Employee-related expenses for our SG&A functions comprise the majority of SG&A expenses.
Contractual Obligations & Off-Balance Sheet Arrangements Contractual Obligations Operating Lease Obligations We lease general office space, laboratory, manufacturing and warehouse facilities, and equipment under noncancelable operating leases for use in our operations.
Actual results may differ from these estimates and have a material impact on our financial condition and results of operations. Contractual Obligations & Off-Balance Sheet Arrangements Contractual Obligations Operating Lease Obligations We lease general office space, laboratory, manufacturing and warehouse facilities, and equipment under noncancelable operating leases for use in our operations.
We have completed analyses through December 31, 2021 to determine whether our net operating losses and credits are likely to be limited by Section 382.
The annual limitations may result in the expiration of net operating loss carryforwards before utilization. We have completed analyses through December 31, 2022 to determine whether our net operating losses and credits are likely to be limited by Section 382.
In July 2022, we launched a new pump software update through TDU to allow all t:slim X2 pump users in the United States to bolus insulin using our smartphone app that is available on compatible iOS and Android devices. Our insulin pump products are generally considered durable medical equipment and have an expected lifespan of at least four years.
As an example, we recently launched a pump software update through TDU to allow all t:slim X2 pump users in the United States access to integration with two new CGM sensor offerings. Our insulin pump products are generally considered durable medical equipment and have an expected lifespan of at least four years.
Other Income and Expense Other income and expense primarily consists of interest expense which includes the amortization of debt issuance costs related to our 1.50% Convertible Senior Notes due 2025, interest earned on our cash equivalents and short-term investments, and changes in the fair value of certain common stock warrants which were issued in October 2017 and expired in October 2022.
Other Income and Expense Other income and expense primarily consists of interest earned on our cash equivalents and short-term investments, foreign currency transaction gains and losses, and interest expense which includes the amortization of debt issuance costs related to our 1.50% Convertible Senior Notes due May 2025 (Notes).
We also experienced an $11.6 million increase in other non-employee discretionary spending, primarily attributable to equipment, outside services, and travel. Research and Development Expenses . R&D expenses increased 51% to $139.1 million for the year ended December 31, 2022, from $92.1 million for the same period in 2021.
We also experienced a $2.8 million increase in other non-employee discretionary spending, primarily attributable to outside consulting, outside services, and travel, in addition to the impact of facilities consolidation charges described above. Research and Development Expenses . R&D expenses increased 22% to $169.7 million for the year ended December 31, 2023, from $139.1 million for the same period in 2022.
The standalone selling price for the Choice Right was estimated based on the adjusted market assessment approach and contemplates the likelihood that the respective option will be exercised. 67 Warranty Reserve We generally provide a four- year assurance type warranty on our insulin pumps to end user customers and may replace any pumps that do not function as intended in accordance with the product specifications within the warranty period.
Warranty Reserve We generally provide a four- year assurance type warranty on our insulin pumps to end user customers and may replace any pumps that do not function as intended in accordance with the product specifications within the warranty period. Insulin pumps returned to us may be refurbished and redeployed.
No election is made by the customer at the time of the initial sale, nor does the right offered to the customer impact the economics associated with how or when the initial pump sale is reimbursed.
Initially, the program requires the deferral of some portion of sales for shipments of eligible pumps, which began in the third quarter of 2022. No election is made by the customer at the time of the initial sale, nor does the right offered to the customer impact the economics associated with how or when the initial pump sale is reimbursed.
Historically, our principal sources of cash have included cash collected from product sales, private and public offerings of equity securities, exercises of employee stock awards, and debt financing.
Historically, our principal sources of cash have included cash collected from product sales, private and public offerings of equity securities, exercises of employee stock awards, and debt financing. We expect to rely on these sources of cash, primarily from product sales, to fund our material cash requirements in both the short and long term.
Utilization of our net operating loss and research credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations provided by Section 382 of the Internal Revenue Code of 1986, as amended, and similar state provisions. The annual limitations may result in the expiration of net operating loss carryforwards before utilization.
Changes in the recognition or measurement of valuation allowance could result in material increases or decreases in our income tax expense in the period in which we make a change, which could have a material impact on our effective tax rate and operating results. 71 Utilization of our net operating loss and research credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations provided by Section 382 of the Internal Revenue Code of 1986, as amended, and similar state provisions.
In the four-year period ended December 31, 2022, we shipped approximately 420,000 t:slim X2 insulin pumps, which is representative of our estimated global installed customer base, assuming the typical four-year reimbursement cycle. Approximately 290,000 of these pumps were shipped to customers in the United States and 130,000 were shipped to customers outside the United States.
In the four-year period ended December 31, 2023, we shipped approximately 450,000 insulin pumps, which is representative of our in-warranty global installed customer base assuming the typical four-year reimbursement cycle. The t:slim X2 has been our flagship technology solution.
Starting in the third quarter of 2018, we began selling our t:slim X2 insulin pump in select geographies outside the United States and our technology solutions are now available in approximately 25 countries worldwide.
From inception in 2012 through June 2018, we derived nearly all of our sales from the shipment of insulin pumps and associated supplies to customers in the United States. Starting in the third quarter of 2018, we began selling in select geographies outside the United States and our technology solutions are now available in approximately 25 countries worldwide.
Sales in the United States for the year ended December 31, 2022 were also reduced by a deferral of $3.5 million as the result of the launch of our Tandem Choice program in the third quarter. No comparable program existed in 2021.
Sales in the United States for the years ended December 31, 2023 and 2022 were reduced by a deferral of $25.1 million and $3.5 million, respectively, as the result of our Tandem Choice program which launched in September of 2022.
The increase in R&D expenses was primarily the result of an increase of $32.4 million in salaries, incentive compensation, non-cash stock based compensation, and other employee benefits due to an increase in personnel to support our product development efforts.
The increase in R&D expenses was primarily the result of a $23.0 million increase in salaries and related benefits due to our acquisitions, as well as an increase in personnel to support our product development efforts.
The income tax expense for the year ended December 31, 2022 was primarily attributable to federal, state and foreign income tax expense as a result of current taxable income in those jurisdictions.
Income tax expense for the years ended December 31, 2023 and 2022 was primarily attributable to federal, state and foreign income tax expense as a result of current taxable income in certain jurisdictions. Liquidity and Capital Resources At December 31, 2023, we had $467.9 million in cash and cash equivalents and short-term investments.
We also incur R&D expenses for supplies, development prototypes, outside design and testing services, depreciation, allocated facilities and information services, clinical trial costs, payments under our licensing, development and commercialization agreements and other indirect costs.
We also incur R&D expenses for supplies, development prototypes, outside design and testing services, depreciation, allocated facilities and information services, clinical trial costs, payments under our licensing, development and commercialization agreements and other indirect costs. 64 Acquired In-process Research and Development (IPR&D) Expenses Acquired IPR&D reflects costs of external research and development projects acquired directly in a transaction other than a business combination, that do not have an alternative future use.
Promissory Note Payable In connection with our acquisition of Capillary Biomedical, Inc. (see Note 12, “Acquisitions”), we assumed $4.7 million of long-term debt.
The amounts involved in any such transactions, individually or in the aggregate, may be material. Promissory Note Payable In connection with our acquisition of Capillary Biomedical, Inc. (see Note 12, “Acquisitions”), we assumed a $4.7 million promissory note payable.
The commencement of operations of our European distribution center in the third quarter also led to downward adjustments to inventory levels from our distributors in late 2022 and early 2023.
For example, we began operations of a European distribution center beginning in the third quarter of 2022, which led to downward adjustments of inventory levels at our distributors starting in late 2022 and continuing through the first half of 2023.
While our significant accounting policies are more fully described in Note 2 “Summary of Significant Accounting Policies” to our consolidated financial statements included in this Annual Report, we believe that the following accounting policies are the most critical to the judgments and estimates used in the preparation of our consolidated financial statements.
While our significant accounting policies are more fully described in Note 2 “Summary of Significant Accounting Policies” to our consolidated financial statements included in this Annual Report, we believe that the following accounting policies are the most critical to the judgments and estimates used in the preparation of our consolidated financial statements. 70 Revenue Recognition Our revenue is generated primarily from sales of our insulin pumps, single-use insulin cartridges and infusion sets to individual customers with third-party insurance coverage and through a network of distributors that resell the products to insulin-dependent diabetes customers.
The increase compared to 2020 was primarily the result of a $43.9 million increase in salaries, incentive compensation and other employee benefits due to an increase in personnel to support additional sales territories, higher sales and other services in support of our growing installed customer base.
Excluding the severance costs described above, the remaining increase of $11.9 million in salaries, incentive compensation, and other employee benefits was primarily the result of continued support services for our growing installed customer base.
Overview We are a medical device company focused on the design, development and commercialization of technology solutions for people living with diabetes. Diabetes management can vary greatly from person-to-person, creating multiple market segments based on clinical needs and personal preferences.
Overview We are a medical device company focused on the design, development and commercialization of technology solutions for people living with diabetes. We consider our primary addressable market to be people who live with type 1 diabetes.
The impact on gross margin from the Tandem Choice program will fluctuate through the expiration of the program based on the timing of availability of a new hardware platform and the number of eligible customers who ultimately elect to participate. 61 Selling, General and Administrative Expenses.
This deferral reduced gross margin by approximately two percentage points in 2023, but had negligible impact in 2022. The impact on gross margin from our Tandem Choice program will fluctuate through the expiration of the program based on the timing of availability of Tandem Mobi and the number of eligible customers who ultimately elect to participate.
In addition to insulin pumps, we sell disposable products that are used together with our pumps and are replaced every few days, including cartridges for storing and delivering insulin, and infusion sets that connect the insulin pump to a user’s body.
In addition to insulin pumps, we sell single-use products that are used together with our pumps and are replaced every few days, including cartridges for storing and delivering insulin, and infusion sets that connect the insulin pump to a user’s body. 61 In the United States, we also offer a data management web application that provides users, their caregivers and their healthcare providers with a fast, easy and visual way to display diabetes therapy management data from our pumps, integrated CGMs and supported blood glucose meters.
Pump sales, which have the highest gross margin, were 59% of total worldwide sales for the year ended December 31, 2021, compared to 63% in 2020.
Pump sales, which have the highest gross margin, were 46% of total worldwide sales, excluding the impact of Tandem Choice in 2023, compared to 53% in 2022. Operating Expenses Our operating expenses for the year ended December 31, 2023 were $600.9 million, compared to $505.8 million for the year ended December 31, 2022.
We also commenced operations of a centralized distribution center in the third quarter of 2022, which resulted in modest disruption to ordering patterns in the fourth quarter as a result of the affected European distributors adjusting their inventory levels for the reduced transit time.
We began operations of a centralized European distribution center in late 2022. This resulted in a material disruption to distributor ordering patterns in the first half of 2023 as affected distributors reduced their pump and supply inventory levels to adjust for the reduced transit time. As a result, pump shipments decreased 32% compared to the year ended December 31, 2022.
Interest income and other, for the years ended December 31, 2021 and 2020, primarily consisted of interest earned on our cash equivalents and short-term investments, which decreased in 2021 primarily due to the lower interest rate environment as compared to 2020. Income Tax Expense (Benefit) .
Other expense, net for 2022 consisted primarily of $6.2 million of interest expense related to our Convertible Senior Notes, offset by $6.1 million of interest income earned on our cash equivalents and short-term investments. Interest income increased in 2023 primarily due to the higher interest rate environment as compared to 2022.
Our competitors are also vulnerable to these uncertainties, which may affect our customer base and sales. Foreign Markets • We have expanded our business and launched new products in select geographies outside the United States.
Foreign Markets • We have expanded our business and launched new products in select geographies outside the United States. The ordering patterns of our distributors outside the United States is highly variable from period to period.
Sales to distributors accounted for 65% and 67% of our total sales in the United States for the years ended December 31, 2022 and 2021, respectively.
Pump sales outside the United States also included a reduction to sales of $8.5 million for a new rebate structure implemented in a single market. Sales to distributors accounted for 99% and 96% of our total sales outside the United States for the years ended December 31, 2023 and 2022, respectively.
In the past four years, we have shipped approximately 420,000 insulin pumps worldwide, which is representative of our estimated global in-warranty installed customer base. Our ending estimated worldwide installed base has increased approximately 29% year over year.
Our ending estimated worldwide installed customer base increased approximately 7% year over year. Over 310,000 pumps were shipped to customers in the United States in the four-year period ended December 31, 2023, which is representative of our U.S. installed customer base.
With programs dedicated to customer retention efforts, we expect such renewal purchases to represent a more significant portion of our shipments in the long-term. Approximately 290,000 pumps were shipped to customers in the United States in the past four years, which aligns with the standard four-year warranty period.
With programs dedicated to customer retention efforts, we expect such renewal purchases to represent an increasing portion of our pump shipments over time. In the four-year period ended December 31, 2023, we shipped more than 450,000 insulin pumps worldwide, which is representative of our global in-warranty installed customer base.
Mobi The Tandem Mobi is approximately half the size of our t:slim X2 pump, and is designed for people who seek even greater discretion and flexibility with the use of their insulin pump.
At approximately half the size of our t:slim X2 pump, Tandem Mobi is designed for people who seek even greater discretion and flexibility, and includes features such as expanded pump-control from our iOS mobile application, inductive charging, and an on-pump button that can be used for bolusing and other actions.
Our liquidity position and capital requirements are subject to fluctuation based on a number of factors.
The reduction in proceeds from the issuance of common stock under our stock plans was primarily due to the decrease in the market price of our common stock and fewer employee stock options exercised. Our liquidity position and capital requirements are subject to fluctuation based on a number of factors.