Biggest changeThe following table provides information regarding revenue, including net product sales and license and collaboration revenue ( in thousands ): Year Ended December 31, Year Ended December 31, 2022 2021 Change 2021 2020 Change Bile acid products $ 102,558 $ 95,654 $ 6,904 $ 95,654 $ 89,438 $ 6,216 Tiopronin products 97,970 115,122 (17,152) 115,122 108,883 6,239 Total net product sales 200,528 210,776 (10,248) 210,776 198,321 12,455 License and collaboration revenue 11,490 16,714 (5,224) 16,714 — 16,714 Total revenue $ 212,018 $ 227,490 $ (15,472) $ 227,490 $ 198,321 $ 29,169 Net product sales Net product sales for the years ended December 31, 2022, 2021 and 2020 were $200.5 million, $210.8 million and $198.3 million, respectively, and consisted of sales of Chenodal and Cholbam ("Bile acid products") and Thiola ("Tiopronin products"). 67 Table of Contents The decrease in net product sales for the year ended December 31, 2022 as compared to the same period in 2021 was primarily due to a decrease in Thiola net sales, partially offset by an increase in net sales of our bile acid products.
Biggest changeRevenue For further background on our net product sales and license and collaboration revenue, see Revenue Recognition under our Critical Accounting Estimates. 72 Table of Contents The following table provides information regarding revenue, including net product sales and license and collaboration revenue ( in thousands ): Year Ended December 31, Year Ended December 31, 2023 2022 Change 2022 2021 Change Tiopronin products $ 98,329 $ 97,970 $ 359 $ 97,970 $ 115,122 $ (17,152) FILSPARI 29,208 — 29,208 — — — Total net product sales 127,537 97,970 29,567 97,970 115,122 (17,152) License and collaboration revenue 17,701 11,490 6,211 11,490 16,714 (5,224) Total revenue $ 145,238 $ 109,460 $ 35,778 $ 109,460 $ 131,836 $ (22,376) Net product sales The $29.6 million increase in total net product revenues for the year ended December 31, 2023 compared to the year ended December 31, 2022 was primarily due the launch of FILSPARI in February 2023 and subsequent sales throughout the year.
Overview We are a biopharmaceutical company headquartered in San Diego, California, focused on identifying, developing and delivering life-changing therapies to people living with rare kidney, liver, and metabolic diseases. Our approach centers on advancing our innovative pipeline with multiple late-stage clinical programs targeting rare diseases with significant unmet medical needs.
Overview We are a biopharmaceutical company headquartered in San Diego, California, focused on identifying, developing and delivering life-changing therapies to people living with rare kidney and metabolic diseases. Our approach centers on advancing our innovative pipeline with multiple late-stage clinical programs targeting rare diseases with significant unmet medical needs.
FILSPARI, a once-daily, oral medication is designed to selectively target two critical pathways in the disease progression of IgAN (endothelin 1 and angiotensin-II) and is the first and only non-immunosuppressive therapy approved for the treatment of this condition. FILSPARI (sparsentan) is a dual endothelin angiotensin receptor antagonist (DEARA).
FILSPARI, a once-daily, oral medication is designed to selectively target two critical pathways in the disease progression of IgAN (endothelin 1 and angiotensin-II) and is the first and only non-immunosuppressive therapy approved for the treatment of this condition. FILSPARI is a dual endothelin angiotensin receptor antagonist (DEARA).
On March 11, 2022, coinciding with the issuance of the 2029 Notes, we completed our repurchase of $207.1 million aggregate principal amount of 2025 Notes for cash. After giving effect to the repurchase, the total remaining principal amount outstanding under the 2025 Notes as of December 31, 2022 was $68.9 million.
On March 11, 2022, coinciding with the issuance of the 2029 Notes, we completed our repurchase of $207.1 million aggregate principal amount of 2025 Notes for cash. After giving effect to the repurchase, the total remaining principal amount outstanding under the 2025 Notes as of December 31, 2023 was $68.9 million.
Beyond the next 12 months and over the foreseeable future, our known commitments and potential financial obligations will likely include ongoing operations funding, operating lease payments, interest payments on our outstanding debt, royalties on sales of our existing commercialized products, research and development expenses pertaining to clinical and preclinical development activities across our pipeline, milestone and royalty payments associated with FILSPARI, pegtibatinase (TVT-058), and other developmental programs based upon the achievement of certain agreement-specific criteria, along with sales-based royalties and the repayment of principal on the outstanding 2025 Notes and 2029 Notes upon their respective maturities.
Beyond the next 12 months and over the foreseeable future, our known commitments and potential financial obligations will likely include ongoing operations funding, operating lease payments, interest payments on our outstanding debt, royalties on sales of our existing commercialized products, research and development expenses pertaining to clinical and preclinical development activities across our pipeline, milestone and royalty payments associated with FILSPARI, pegtibatinase, and other developmental programs based upon the achievement of certain agreement-specific criteria, along with sales-based royalties and the repayment of principal on the outstanding 2025 Notes and 2029 Notes upon their respective maturities.
We are subject to generic competition, and if additional generic versions of Thiola, any generic versions of Thiola EC, any generic versions of FILSPARI following the expiration of patent or regulatory exclusivity for the product, or generic versions of Cholbam or Chenodal or any of our current or future products, are approved, sales of that product likely would be negatively impacted, which could have a material adverse impact on the recoverability of certain related intangible assets.
We are subject to generic competition, and if additional generic versions of Thiola and Thiola EC, any generic versions of FILSPARI following the expiration of patent or regulatory exclusivity for the product, or any of our current or future products, are approved, sales of that product likely would be negatively impacted, which could have a material adverse impact on the recoverability of certain related intangible assets.
We expect to use cash flows from operations and outside financings to meet our current and future financial obligations, including funding our operations, debt service and capital expenditures. Our ability to make these payments depends on our future performance, which will be affected by financial, business, economic, regulatory and other factors, many of which we cannot control.
We expect to use cash flows from operations and, when necessary, outside financings, to meet our current and future financial obligations, including funding our operations, debt service and capital expenditures. Our ability to make these payments depends on our future performance, which will be affected by financial, business, economic, regulatory and other factors, many of which we cannot control.
See Note 7 to Consolidated Financial Statements for further discussion. 73 Table of Contents Funding Requirements We believe that our available cash and short-term investments as of the date of this filing will be sufficient to fund our anticipated level of operations beyond the next 12 months.
See Note 7 to Consolidated Financial Statements for further discussion. 79 Table of Contents Funding Requirements We believe that our available cash and short-term investments as of the date of this filing will be sufficient to fund our anticipated level of operations beyond the next 12 months.
Factors that may affect financing requirements include, but are not limited to: • the timing, progress, cost and results of our clinical trials, preclinical studies and other discovery and research and development activities; • the timing and outcome of, and costs involved in, seeking and obtaining marketing approvals for our products, and in maintaining quality systems standards for our products; • the timing of, and costs involved in, commercial activities, including product marketing, sales and distribution; • our ability to successfully commercialize FILSPARI for IgAN and to obtain regulatory approval for, and successfully commercialize, sparsentan for FSGS and our other or future product candidates; • increases or decreases in revenue from our marketed products, including decreases in revenue resulting from generic entrants or health epidemics or pandemics such as COVID-19; • debt service obligations on the 2025 Notes and 2029 Notes; • the number and development requirements of other product candidates that we pursue; • our ability to manufacture sufficient quantities of our products to meet expected demand; • the costs of preparing, filing, prosecuting, maintaining and enforcing any patent claims and other intellectual property rights, litigation costs and the results of litigation; • our ability to enter into collaboration, licensing or distribution arrangements and the terms and timing of these arrangements; • the potential need to expand our business, resulting in additional payroll and other overhead expenses; • the potential in-licensing of other products or technologies; • the emergence of competing technologies or other adverse market or technological developments; and • the impacts of inflation and resulting cost increases.
Factors that may affect financing requirements include, but are not limited to: • the timing, progress, cost and results of our clinical trials, preclinical studies and other discovery and research and development activities; • the timing and outcome of, and costs involved in, seeking and obtaining marketing approvals for our products, and in maintaining quality systems standards for our products; • the timing of, and costs involved in, commercial activities, including product marketing, sales and distribution; • our ability to successfully commercialize FILSPARI for IgAN, to obtain full regulatory approval for, and successfully commercialize, FILSPARI for the treatment of IgAN, and to obtain regulatory approval for, and successfully commercialize, sparsentan for FSGS and our other or future product candidates; • increases or decreases in revenue from our marketed products, including decreases in revenue resulting from generic entrants or health epidemics or pandemics; • debt service obligations on the 2025 Notes and 2029 Notes; • the number and development requirements of other product candidates that we pursue; • our ability to manufacture sufficient quantities of our products to meet expected demand; • the costs of preparing, filing, prosecuting, maintaining and enforcing any patent claims and other intellectual property rights, litigation costs and the results of litigation; • our ability to enter into collaboration, licensing or distribution arrangements and the terms and timing of these arrangements; • the potential need to expand our business, resulting in additional payroll and other overhead expenses; • the potential in-licensing of other products or technologies; • the emergence of competing technologies or other adverse market or technological developments; and • the impacts of inflation and resulting cost increases.
In addition, it would be required to make cash milestone payments totaling up to an aggregate $16.0 million upon the achievement of certain development and regulatory milestones, plus tiered royalty payments of less than 4% on future net sales of a product, if approved.
In addition, we would be required to make cash milestone payments totaling up to an aggregate $16.0 million upon the achievement of certain development and regulatory milestones, plus tiered royalty payments of less than 4% on future net sales of a product, if approved.
Under the Agreement, we also agreed to make contingent cash payments up to an aggregate of $427.0 million based on the achievement of certain development, regulatory and commercialization events as set forth in the Agreement, as well as additional tiered mid-single digit royalty payments based upon future net sales of any pegtibatinase products in the US and Europe, subject to certain reductions as set forth in the Agreement, and a contingent payment in the event a pediatric rare disease voucher for any pegtibatinase product is granted.
Under the Stock Purchase Agreement ("the Agreement"), we agreed to make contingent cash payments up to an aggregate of $427.0 million based on the achievement of certain development, regulatory and commercialization events as set forth in the Agreement, as well as additional tiered mid-single digit royalty payments based upon future net sales of any pegtibatinase products in the US and Europe, subject to certain reductions as set forth in the Agreement, and a contingent payment in the event a pediatric rare disease voucher for any pegtibatinase product is granted.
We remain responsible for the clinical development of sparsentan and will retain all rights to sparsentan in the United States and rest of world outside of the licensed territories, provided that CSL Vifor has a right of negotiation to expand the licensed territories into Canada, China, Brazil and/or Mexico.
We remain responsible for the clinical development of sparsentan in the applicable territories and we will retain all rights to sparsentan in the United States and rest of world outside of the territories licensed to CSL Vifor and Renalys, provided that CSL Vifor has a right of negotiation to expand the licensed territories into Canada, China, Brazil and/or Mexico.
License and collaboration revenue The decrease in license and collaboration revenue for the year ended December 31, 2022 as compared to the same period in 2021 was primarily due to the recognition of $12.0 million in license revenue upon entering into the CSL Vifor License Agreement in September 2021, offset by an increase in collaboration revenue associated with the CSL Vifor License Agreement.
The decrease in license and collaboration revenue for the year ended December 31, 2022 as compared to the year ended December 31, 2021 was primarily due to the recognition of $12.0 million in license revenue upon entering into the CSL Vifor License Agreement in September 2021, offset by an increase in collaboration revenue associated with the CSL Vifor License Agreement.
After 36 weeks of treatment, patients receiving FILSPARI achieved a mean reduction in proteinuria from baseline of 49.8 percent, compared to a mean reduction in proteinuria from baseline of 15.1 percent for irbesartan-treated patients (p Per request from the FDA, the efficacy data contained in the FDA-approved label is a post-hoc sensitivity analysis that evaluates the first 281 randomized patients, a subset of the full trial population.
After 36 weeks of treatment, patients receiving FILSPARI achieved a mean reduction in proteinuria from baseline of 49.8 percent, compared to a mean reduction in proteinuria from baseline of 15.1 percent for irbesartan-treated patients (p Per request from the FDA, the efficacy data contained in the FDA-approved label under accelerated approval is a post-hoc sensitivity analysis that evaluates the first 281 randomized patients, a subset of the full trial population.
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS Our discussion and analysis of our financial condition and results of operations for 2022 as compared to 2021 are discussed below, and should be read in conjunction with our audited Consolidated Financial Statements, including the notes thereto.
ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS Our discussion and analysis of our financial condition and results of operations for 2023 as compared to 2022 are discussed below and should be read in conjunction with our audited Consolidated Financial Statements, including the notes thereto.
Upon approval of any of our late-stage programs, we intend to leverage the skills of our talented commercial organization which has successfully identified, supported and treated patients prescribed our approved products over the last nine years.
Upon approval of any of our late-stage programs, we intend to leverage the skills of our talented commercial organization which has successfully identified, supported and treated patients prescribed our approved products over the last ten years.
We have experienced significant growth in recent years in the number of our employees and the scope of our operations.
We experienced significant growth in recent years in the number of our employees and the scope of our operations.
In February 2021, we announced that the ongoing Phase 3 DUPLEX Study achieved its pre-specified interim FSGS partial remission of proteinuria endpoint following the 36-week interim period. After 36 weeks of treatment, 42.0 percent of patients receiving sparsentan achieved FPRE, compared to 26.0 percent of irbesartan-treated patients (p=0.0094).
In February 2021, we announced that the ongoing Phase 3 DUPLEX Study achieved its pre-specified interim FSGS partial remission of proteinuria endpoint following the 36-week interim period. After 36 weeks of treatment, 42.0 percent of patients receiving sparsentan achieved FPRE, compared to 26.0 percent of irbesartan-treated 67 Table of Contents patients (p=0.0094).
As of December 31, 2022, our evaluation concluded that all such milestones associated with our collaboration and licensing agreements remained constrained and therefore no adjustment to the respective transaction price was necessary.
As of December 31, 2023, our evaluation concluded that all such milestones associated with our collaboration and licensing agreements remained constrained and therefore no adjustment to the respective transaction price was necessary.
For licenses that are not distinct from other promises, we apply judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or a point in time and, if over time, the 65 Table of Contents appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, upfront fees.
For licenses that are not distinct from other promises, we apply judgment to assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or a point in time and, if over time, the appropriate method of measuring progress for purposes of recognizing revenue from non-refundable, upfront fees.
Collaboration and License Proceeds License and Collaboration Agreement with CSL Vifor On September 15, 2021, we entered into a License Agreement with CSL Vifor, pursuant to which we granted an exclusive license to CSL Vifor for the commercialization of sparsentan in the Licensed Territories.
Collaboration and License Proceeds License and Collaboration Agreement with CSL Vifor In September, 2021, we entered into a License Agreement with CSL Vifor, pursuant to which we granted an exclusive license to CSL Vifor for the commercialization of sparsentan in the Licensed Territories.
In 2022, there were no new collaboration and licensing agreements with customers which required an estimate of the stand-alone selling price for an underlying performance obligation.
In 2023, there were no new collaboration and licensing agreements with customers which required an estimate of the stand-alone selling price for an underlying performance obligation.
Research and development expenses Research and development costs include expenses related to sparsentan, pegtibatinase (TVT-058) and our other pipeline programs. We expense all research and development costs as they are incurred.
Research and development expenses Research and development costs include expenses related to sparsentan, pegtibatinase and our other pipeline programs. We expense all research and development costs as they are incurred.
Secondary efficacy endpoints include the rate of change in eGFR following the initiation of randomized treatment over 58-week and 110-week periods, as well as the rate of change in eGFR over 52-week and 104-week periods following the first six weeks of randomized treatment in approximately 380 patients.
Secondary efficacy endpoints include the rate of change in estimated glomerular filtration rate (eGFR) following the initiation of randomized treatment over 58-week and 110-week periods, as well as the rate of change in eGFR over 52-week and 104-week periods following the first six weeks of randomized treatment in approximately 380 patients.
For a discussion of our financial condition and results of operations for 2021 as compared to 2020, except as set forth below, please refer to Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 202 1 Annual Report on Form 10-K , which discussion is incorporated by reference herein.
For a discussion of our financial condition and results of operations for 2022 as compared to 2021, except as set forth below, please refer to Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our 202 2 Annual Report on Form 10-K , which discussion is incorporated by reference herein.
The Black-Scholes option valuation model requires the input of subjective assumptions to calculate the value of stock options. For restricted stock units, the value of the award is based on our stock price at the grant date.
The Black-Scholes option valuation model 71 Table of Contents requires the input of subjective assumptions to calculate the value of stock options. For restricted stock units, the value of the award is based on our stock price at the grant date.
The Company has the right to terminate the Agreements and return the shares for a nominal price at any time upon 60 days' notice, subject to survival of contingent obligations, if any. See Note 5 to Consolidated Financial Statements for further discussion.
We have the right to terminate the Agreements and return the shares for a nominal price at any time upon 60 days' notice, subject to survival of contingent obligations, if any. See Note 5 to Consolidated Financial Statements for further discussion.
We currently have three Phase 3 clinical trials in process that are in varying stages of activity, with ongoing non-clinical support trials that are significant and changes in estimates could have a material impact on expenses we recognize.
We currently have one Phase 1/2 clinical trial and three Phase 3 clinical trials in process that are in varying stages of activity, with ongoing non-clinical support trials that are significant and changes in estimates could have a material impact on expenses we recognize.
Pegtibatinase is currently being evaluated in the Phase 1/2 COMPOSE Study, a double blind, randomized, placebo-controlled dose escalation study to assess its safety, tolerability, pharmacokinetics, pharmacodynamics and clinical effects in patients with classical HCU. In December 2021, we announced positive topline results from the Phase 1/2 COMPOSE Study.
In December 2021, we announced positive topline results from the Phase 1/2 COMPOSE Study, a double blind, randomized, placebo-controlled dose escalation study to assess its safety, tolerability, pharmacokinetics, pharmacodynamics and clinical effects in patients with classical HCU.
For the years ended December 31, 2022, 2021 and 2020, the Company recorded a net product revenue increase of $0.8 million, $0.4 million, and $0.4 million, respectively, related to performance obligations satisfied in previous periods.
For the years ended December 31, 2023, 2022 and 2021, the Company recorded a net product revenue increase of $0.4 million, $0.2 million, and $0.2 million, respectively, related to performance obligations satisfied in previous periods.
Impairment of Intangible Assets subject to amortization Intangible assets subject to amortization include certain license agreements and purchased technologies. Intangible assets subject to amortization are reviewed for impairment whenever events or circumstances indicate that the carrying amount of these assets may not be recoverable and are also reviewed annually to determine whether any impairment is necessary.
Intangible assets subject to amortization are reviewed for impairment whenever events or circumstances indicate that the carrying amount of these assets may not be recoverable and are also reviewed annually to determine whether any impairment is necessary.
In light of global and macroeconomic conditions, including rising interest rates and volatility in the capital markets, we may not be able to successfully conduct financing or refinancing activity on favorable terms or at all.
In light of global and macroeconomic conditions, including rising interest rates, liquidity concerns at, and failures of, banks and other financial institutions, and volatility in the capital markets, we may not be able to successfully conduct financing or refinancing activity on favorable terms or at all.
Clinical-Stage Programs: Sparsentan for the treatment of FSGS Sparsentan has been granted Orphan Drug Designation for the treatment of FSGS in the U.S. and Europe. FSGS is a leading cause of end-stage kidney disease (ESKD) and nephrotic syndrome.
Clinical-Stage Programs: Sparsentan for the treatment of FSGS Sparsentan has been granted Orphan Drug Designation for the treatment of FSGS in the U.S. and the EEA. FSGS is a leading cause of kidney failure and nephrotic syndrome.
Over the next 12 months, our expected financial obligations include, but are not limited to, funding our operations, operating lease payments, interest payments on our outstanding debt, royalties on sales of our existing commercialized products, research and development expenses pertaining to clinical and preclinical development activities across our pipeline, expenses associated with the potential launch of FILSPARI, including purchase commitments for manufactured product, and, if approved, related milestone payments.
Over the next 12 months, our expected financial obligations include, but are not limited to, funding our operations, operating lease payments, interest payments on our outstanding debt, anticipated milestone payments, royalties on sales of our existing commercialized products, research and development expenses pertaining to clinical and preclinical development activities across our pipeline, expenses associated with the launch of FILSPARI.
The following weighted average assumptions were used in the Black-Scholes options pricing model to estimate the fair value of stock options for the specified reporting periods: Year Ended December 31, 2022 2021 2020 Risk free rate 1.7 % 0.6 % 1.5 % Expected volatility 50 % 59 % 64 % Expected life (in years) 6.4 6.4 6.3 Expected dividend yield — — — Total non-cash stock-based compensation expense consisted of the following for the years ended December 31, 2022, 2021 and 2020: $39.2 million, $30.8 million and $23.6 million, respectively.
The following weighted average assumptions were used in the Black-Scholes options pricing model to estimate the fair value of stock options for the specified reporting periods: Year Ended December 31, 2023 2022 2021 Risk free rate 3.9 % 1.7 % 0.6 % Expected volatility 50 % 50 % 59 % Expected life (in years) 6.4 6.4 6.4 Expected dividend yield — — — For the years ended December 31, 2023, 2022 and 2021, non-cash stock-based compensation expense totaled $44.2 million, $38.1 million and $29.6 million, respectively.
Cash Flows from Financing Activities For the year ended December 31, 2022, cash provided by financing activities was $117.6 million compared to cash provided of $231.7 million for the year ended December 31, 2021.
Cash Flows from Financing Activities For the year ended December 31, 2023, cash provided by financing activities was $218.8 million compared to cash provided of $117.6 million for the year ended December 31, 2022.
We have expanded our sales and marketing, compliance and legal functions in addition to expansion of all functions to support a commercial organization, including by adding additional members to our sales force in anticipation of the commercialization of FILSPARI in the United States for the treatment of IgAN.
We also expanded our sales and marketing, compliance and legal functions in addition to expansion of all functions to support a commercial organization, including by adding additional members to our sales force in connection with the recent commercial launch of FILSPARI in the United States for IgAN.
See Note 5 to Consolidated Financial Statements for further discussion. Stock Purchase and Collaboration Agreement with PharmaKrysto On March 8, 2022, the Company entered into a Collaboration Agreement with PharmaKrysto Limited (“PharmaKrysto”), a privately held pre-clinical stage company related to PharmaKrysto's early-stage cystinuria discovery program, and concurrently therewith entered into a Stock Purchase Agreement with PharmaKrysto (together, the "Agreements").
Stock Purchase and Collaboration Agreement with PharmaKrysto On March 8, 2022, we entered into a Collaboration Agreement with PharmaKrysto Limited (“PharmaKrysto”), a privately held pre-clinical stage company related to PharmaKrysto's early-stage cystinuria discovery program, and concurrently therewith entered into a Stock Purchase Agreement with PharmaKrysto (together, the "Agreements").
The change was primarily due to loss on extinguishment of debt in connection with the partial repurchase in 2022 of the Convertible Senior Notes due 2025, offset by reduced interest expense due to adoption of ASU 2020-06, Accounting for Convertible Instruments and Contracts in an Entity's Own Equity ("ASU 2020-06") as debt discount is no longer amortized.
The $6.1 million change in our total other income (expense), net for the year ended December 31, 2022 compared to the year ended December 31, 2021 was primarily due to loss on extinguishment of debt in connection with the partial repurchase in 2022 of the Convertible Senior Notes due 2025, offset by reduced interest expense due to adoption of ASU 2020-06, Accounting for Convertible Instruments and Contracts in an Entity's Own Equity ("ASU 2020-06") as debt discount is no longer amortized.
Our research and development costs are comprised of salaries and bonuses, benefits, non-cash share-based compensation, license fees, milestones under license agreements, costs paid to third-party contractors to perform research, conduct clinical trials, and develop drug materials and delivery methods, and associated overhead expenses and facilities costs. We charge direct internal and external program costs to the respective development programs.
Our research and development costs are comprised of salaries and bonuses, benefits, non-cash share-based compensation, license fees, milestones under license agreements, costs paid to third-party contractors to perform research, conduct clinical trials, and develop drug materials and delivery methods, manufacture drug product supplies to support clinical development, and associated overhead expenses and facilities costs.
Therefore, cash and short-term investments available to fund operations is $450.2 million as of December 31, 2022. Cash Flows from Operating Activities Operating activities used $186.3 million of cash during the year ended December 31, 2022 compared to $14.8 million of cash used for the year ended December 31, 2021.
Therefore, cash and short-term investments available to fund operations is $566.9 million as of December 31, 2023. Cash Flows from Operating Activities Operating activities used $280.0 million of cash during the year ended December 31, 2023 compared to $186.3 million of cash used for the year ended December 31, 2022.
In 2018, we announced the initiation of the Phase 3 DUPLEX study of sparsentan in FSGS. The DUPLEX Study is a global, randomized, multicenter, double-blind, parallel-arm, active-controlled clinical trial evaluating the safety and efficacy of sparsentan in 371 patients.
In 2018, we announced the initiation of the Phase 3 clinical trial designed to serve as the basis for an NDA and MAA filing for sparsentan for the treatment of FSGS (the "DUPLEX Study"). The DUPLEX Study is a global, randomized, multicenter, double-blind, parallel-arm, active-controlled clinical trial evaluating the safety and efficacy of sparsentan in 371 patients.
Liquidity and Capital Resources We have financed our operations through a combination of borrowings, sales of our equity securities, and revenues generated from our commercialized products, including Chenodal, Cholbam, Thiola and Thiola EC, along with proceeds from license and collaboration agreements.
Liquidity and Capital Resources We have financed our operations through a combination of borrowings, sales of our equity securities, and revenues generated from our commercialized products, along with proceeds from license and collaboration agreements and the divestiture of our bile acid business.
Pegtibatinase (TVT-058) Pegtibatinase (TVT-058) is a novel investigational human enzyme replacement candidate being evaluated for the treatment of classical homocystinuria (HCU). Classical HCU is a rare metabolic disorder characterized by elevated levels of plasma homocysteine that can lead to vision, skeletal, circulatory and central nervous system complications.
Pegtibatinase Pegtibatinase is a novel investigational human enzyme replacement candidate being evaluated for the treatment of classical homocystinuria (HCU). Classical HCU is a rare metabolic disorder characterized by elevated levels of plasma homocysteine that can lead to vision, skeletal, circulatory and central nervous system complications. It is estimated that there are approximately 7,000 to 10,000 people living with HCU globally.
Increases include combined employee compensation and stock compensation costs of $31.6 million, increases in commercial support expenses of $15.5 million and increases in various professional services expenses of $11.9 million. A combined increase in selling, general and administrative expenses of $7.2 million was primarily attributable to incremental increases in information technology expense, legal fees, travel expense, and depreciation and amortization.
Increases include combined employee compensation and stock compensation costs of $31.9 million, increases in commercial support expenses of $15.6 million and increases in various professional services expenses of $12.0 million. Incremental increases in information technology expense, legal fees, travel expense, and depreciation and amortization also contributed to the increase in selling, general and administrative expenses.
Additionally, in a dose-dependent manner in the study to date, methionine levels were substantially reduced and cystathionine levels were substantially elevated following treatment with pegtibatinase, suggesting that pegtibatinase acts in a manner similar to the native CBS enzyme. To date in the study, pegtibatinase has been generally well-tolerated , with no discontinuations due to treatment-related adverse events.
Additionally, in a dose-dependent manner in the study to date, methionine levels were substantially reduced and cystathionine levels were substantially elevated following treatment with pegtibatinase, suggesting that pegtibatinase acts in a manner similar to the native CBS enzyme.
("CSL Vifor"), with whom we entered into a license and collaboration agreement ("License Agreement") in September 2021, announced that the European Medicines Agency ("EMA") had accepted for review the conditional marketing authorization application of sparsentan for the treatment of IgAN in Europe. A review decision is expected in the second half of 2023.
("CSL Vifor"), with whom we entered into a license and collaboration agreement ("License Agreement") in September 2021, announced that the EMA had accepted for review the conditional marketing authorization ("CMA") application of sparsentan for the treatment of IgAN in the EU.
We are also entitled to receive tiered double-digit royalties of up to 40 percent of annual net sales of sparsentan in the Licensed Territories. See Note 4 to Consolidated Financial Statements for further discussion.
We are also entitled to receive tiered double-digit royalties of up to 40 percent of annual net sales of sparsentan in the Licensed Territories.
Thiola License Agreement In 2014, we entered into a license agreement with Mission Pharmacal ("Mission"), pursuant to which we obtained an exclusive, royalty-bearing license to market, sell and commercialize Thiola (tiopronin) in the United States and Canada, and a non-exclusive license to use know-how relating to Thiola to the extent necessary to market Thiola.
See Note 9 to our unaudited Consolidated Financial Statements for further discussion. 78 Table of Contents Thiola License Agreement In 2014, we entered into a license agreement with Mission Pharmacal ("Mission"), pursuant to which we obtained an exclusive, royalty-bearing license to market, sell and commercialize Thiola (tiopronin) in the United States and Canada, and a non-exclusive license to use know-how relating to Thiola to the extent necessary to market Thiola.
Selling, general and administrative expenses increased by $70.3 million due to increased headcount as a result of operational growth, including rising labor costs, and commercial launch preparations in anticipation of the U.S. launch of FILSPARI.
For the year ended December 31, 2022 compared to the year ended December 31, 2021 our selling, general and administrative expenses increased by $71.2 million due to increased headcount as a result of operational growth, including rising labor costs, and commercial launch preparations in anticipation of the U.S. launch of FILSPARI.
Pre-clinical data have shown that blockade of both endothelin type A and angiotensin II type 1 pathways in forms of rare chronic kidney disease, reduces proteinuria, protects podocytes and prevents glomerulosclerosis and mesangial cell proliferation. Sparsentan has been granted Orphan Drug Designation for the treatment of IgAN in the U.S. and Europe.
Pre-clinical data have shown that blockade of both endothelin type A and angiotensin II type 1 pathways in forms of rare chronic kidney disease, reduces proteinuria, protects podocytes and prevents glomerulosclerosis and mesangial cell proliferation.
We routinely engage vendors and service providers for scientific research, clinical trial, regulatory compliance, manufacturing and other consulting services. We also make grants to research and non-profit organizations to conduct research which may lead to new intellectual properties that we may subsequently license under separately negotiated license agreements. Such grants may be funded in lump sums or installments.
We also make grants to research and non-profit organizations to conduct research which may lead to new intellectual properties that we may subsequently license under separately negotiated license agreements. Such grants may be funded in lump sums or installments.
Under the Collaboration Agreement, the Company will fund all research and development expenses for the pre-clinical activities associated with the cystinuria program, which are estimated to be approximately $5.0 million.
The Agreements also require us to fund all research and development expenses for the pre-clinical activities associated with the cystinuria program, which are expected to be approximately $5.0 million.
See Note 9 to Consolidated Financial Statements for further discussion. 72 Table of Contents Acquisition of Orphan Technologies Limited In November 2020, we completed the acquisition of Orphan Technologies Limited (“Orphan”), including Orphan’s rare metabolic disorder drug pegtibatinase. We acquired Orphan by purchasing all of its outstanding shares.
Acquisition of Orphan Technologies Limited In November 2020, we completed the acquisition of Orphan Technologies Limited (“Orphan”), including Orphan’s rare metabolic disorder drug pegtibatinase. We acquired Orphan by purchasing all of its outstanding shares.
We believe that our available cash and short-term investments as of the date of this filing, together with anticipated cash generated from operations, will be sufficient to fund our anticipated level of operations beyond the next 12 months.
These restructuring adjustments are expected to result in an estimated annualized savings of approximately $25.0 million beginning in 2024. We believe that our available cash and short-term investments as of the date of this filing, together with anticipated cash generated from operations, will be sufficient to fund our anticipated level of operations beyond the next 12 months.
These generic versions of the original formulation of Thiola have impacted sales, and these or additional generic versions of either formulation could have a material adverse impact on sales.
These generic versions of the original formulation of Thiola have impacted our sales, and these or additional generic versions of either formulation could have a material adverse impact on sales. During 2023, two generic versions of Thiola EC (100 mg and 300 mg) were approved by the FDA.
Of the $100.0 million originally authorized for sale under the ATM Agreement, approximately $28.6 million were sold under our prior registration statement on Form S-3 (Registration Statement No. 333-227182).
Of the $100.0 million originally authorized for sale under the ATM Agreement, approximately $28.6 million were sold under our prior registration statement on Form S-3 (Registration Statement No. 333-227182). An additional $51.9 million were sold under our effective registration statement on Form S-3 (Registration Statement No. 333-259311), which included $20.1 million in the year ended December 31, 2022.
FILSPARI™ (sparsentan) On February 17, 2023, the FDA granted accelerated approval of FILSPARI™ (sparsentan) to reduce proteinuria in adults with primary IgAN at risk of rapid disease progression, generally at UPCR ≥1.5 gram/gram. We expect FILSPARI to be available beginning the week of February 27, 2023, and will be providing a comprehensive patient support program throughout the patient’s treatment journey.
FILSPARI® (sparsentan) On February 17, 2023, the FDA granted accelerated approval of FILSPARI® (sparsentan) to reduce proteinuria in adults with primary IgAN at risk of rapid disease progression, generally a UPCR ≥1.5 gram/gram.
We also incur indirect costs that are not allocated to specific programs because such costs benefit multiple development programs and allow us to increase our pharmaceutical development capabilities. These consist of internal shared resources related to the development and maintenance of systems and processes applicable to all of our programs.
We charge direct internal and external program costs to the respective development programs. We also incur indirect costs that are not allocated to specific programs because such costs benefit multiple development programs and allow us to increase our pharmaceutical development capabilities.
Cash Flows The following table summarizes our cash flows for the periods set forth below ( in thousands ): Year Ended December 31, 2022 2021 2020 Net cash used in operating activities $ (186,291) $ (14,792) $ (42,743) Net cash used in investing activities (32,553) (137,623) (61,327) Net cash provided by financing activities 117,573 231,683 127,713 Effect of exchange rate changes on cash (2,794) 1,713 (1,307) Net (decrease) increase in cash and cash equivalents (104,065) 80,981 22,336 Cash and cash equivalents, beginning of year 165,753 84,772 62,436 Cash and cash equivalents, end of year $ 61,688 $ 165,753 $ 84,772 74 Table of Contents Management considers marketable debt securities to be available to fund current operations, and they are classified as available for sale and included within current assets in our Consolidated Balance Sheets.
Future capital requirements will also depend on the extent to which we acquire or invest in additional complementary businesses, products and technologies. 80 Table of Contents Cash Flows The following table summarizes our cash flows for the periods set forth below ( in thousands ): Year Ended December 31, 2023 2022 2021 Net cash used in operating activities $ (280,021) $ (186,291) $ (14,792) Net cash provided by (used in) investing activities 55,776 (32,553) (137,623) Net cash provided by financing activities 218,752 117,573 231,683 Effect of exchange rate changes on cash 1,981 (2,794) 1,713 Net (decrease) increase in cash and cash equivalents (3,512) (104,065) 80,981 Cash and cash equivalents, beginning of year 61,688 165,753 84,772 Cash and cash equivalents, end of year 58,176 61,688 165,753 Marketable debt securities, at fair value 508,675 388,557 387,129 Total cash and cash equivalents and marketable debt securities $ 566,851 $ 450,245 $ 552,882 Management considers marketable debt securities to be available to fund current operations, and they are classified as available for sale and included within current assets in our Consolidated Balance Sheets.
It is estimated that there are at least 3,500 people living with HCU in the United States with similar numbers in Europe. Pegtibatinase has been granted Rare Pediatric Disease, Fast Track and Breakthrough Therapy designations by the FDA, as well as orphan drug designation in the United States and European Union.
Pegtibatinase has been granted Rare Pediatric Disease, Fast Track and Breakthrough Therapy designations by the FDA, as well as orphan drug designation in the United States and European Union.
FILSPARI is the first and only non-immunosuppressive therapy approved for this condition. At launch, we expect approximately 30,000 to 50,000 patients in the United States to be addressable under FILSPARI's accelerated approval indication statement.
Most patients are diagnosed between the ages of 16 and 35, with up to 40% progressing to kidney failure within 15 years. FILSPARI is the first and only non-immunosuppressive therapy approved for this condition. We estimate approximately 30,000 to 50,000 patients in the United States to be addressable under FILSPARI's accelerated approval indication statement.
Oral administration of CDCA has been shown to normalize primary bile acid synthesis in patients with CTX. 64 Table of Contents Critical Accounting Estimates Management makes certain judgments and uses certain estimates and assumptions when applying accounting principles generally accepted in the United States (“GAAP”) in the preparation of our Consolidated Financial Statements.
Critical Accounting Estimates Management makes certain judgments and uses certain estimates and assumptions when applying accounting principles generally accepted in the United States (“GAAP”) in the preparation of our Consolidated Financial Statements.
In 2021, we recognized $10.3 million in interest expense for the amortization of the debt discount in accordance with the previous accounting guidance. The increase in interest income was driven by the impact of increases in short-term interest rates on our interest-bearing security investments.
In 2021, we recognized $10.3 million in interest expense for the amortization of the debt discount in accordance with the previous accounting guidance.
The Agreements require the Company to purchase an additional 5% of the outstanding common shares for $1.0 million upon the occurrence of a specified pre-clinical milestone, and grant an option to the Company to purchase the remaining outstanding shares of PharmaKrysto for $5.0 million upon the occurrence of a subsequent pre-clinical milestone prior to expiration of the option on March 8, 2025.
In addition, the Agreements grant us an option to purchase the remaining outstanding shares of PharmaKrysto for $5.0 million upon the occurrence of a subsequent pre-clinical milestone prior to expiration of the option on March 8, 2025. If we elect to exercise the option, we would be required to perform commercially reasonable clinical diligence obligations.
See Note 18 to Consolidated Financial Statements for further discussion. Purchase Commitments Manufactured Product Certain of the Company's contractual arrangements with contract manufacturing organizations ("CMOs") require binding forecasts or commitments to purchase minimum amounts for the manufacture of drug product supply, which may be material to the Company's financial statements.
Purchase Commitments Manufactured Product Certain of our contractual arrangements with contract manufacturing organizations ("CMOs") require binding forecasts or commitments to purchase minimum amounts for the manufacture of drug product supply, which may be material to our financial statements. Royalties and Contingent Cash Payments Ligand License Agreement In 2012, we entered into an agreement with Ligand Pharmaceuticals, Inc.
Pending supportive data, we anticipate being in position to subsequently submit an NDA for a CTX indication. 63 Table of Contents Preclinical Programs: We are a participant in a Cooperative Research and Development Agreement (CRADA), which forms a multi-stakeholder approach to pool resources with leading experts, and incorporate the patient perspective early in the therapeutic identification and development process.
We acquired pegtibatinase as part of the November 2020 acquisition of Orphan Technologies Limited. Preclinical Programs: We are a participant in a Cooperative Research and Development Agreement (CRADA), which forms a multi-stakeholder approach to pool resources with leading experts and incorporate the patient perspective early in the therapeutic identification and development process.
For the years ended December 31, 2022 and 2021, we had the following balances and financial performance ( in thousands ): December 31, 2022 December 31, 2021 Revenue $ 212,018 $ 227,490 Net loss $ (278,482) $ (180,091) Cash and cash equivalents $ 61,688 $ 165,753 Marketable debt securities, at fair value $ 388,557 $ 387,129 Accumulated deficit $ (1,014,223) $ (765,966) Stockholders' equity $ 42,851 $ 302,112 Net working capital* $ 344,274 $ 458,739 Net working capital ratio** 3.42 4.70 * Current assets less current liabilities **Current assets divided by current liabilities As of December 31, 2022, we had cash and cash equivalents of $61.7 million and available-for-sale marketable debt securities of $388.6 million.
For the years ended December 31, 2023 and 2022, we had the following balances and financial performance ( in thousands ): 76 Table of Contents December 31, 2023 December 31, 2022 Cash and cash equivalents $ 58,176 $ 61,688 Marketable debt securities, at fair value $ 508,675 $ 388,557 Convertible debt $ 377,263 $ 375,545 Accumulated deficit $ (1,125,622) $ (1,014,223) Stockholders' equity $ 200,810 $ 42,851 Net working capital* $ 438,867 $ 344,274 Net working capital ratio** 3.47 3.42 * Current assets less current liabilities **Current assets divided by current liabilities As of December 31, 2023, we had cash and cash equivalents of $58.2 million and available-for-sale marketable debt securities of $508.7 million.
Research and development costs increased by $25.5 million due to increases in clinical trial expenses, chemistry manufacturing and control costs, and related expenses associated with the advancement of our programs in development. Internal personnel costs to support all programs increased by $15.2 million, reflecting increased headcount along with rising labor costs.
For the year ended December 31, 2022 compared to the year ended December 31, 2021, our research and development costs increased by $26.2 million due to increases in clinical trial expenses, chemistry manufacturing and control costs, and related expenses associated with the advancement of our programs in development.
It is a global, randomized, multicenter, double-blind, parallel-arm, active-controlled clinical trial evaluating the 61 Table of Contents safety and efficacy of 400mg of sparsentan, compared to 300mg of irbesartan, in 404 patients ages 18 years and up with IgAN and persistent proteinuria despite available ACE or ARB therapy.
It is a global, randomized, multicenter, double-blind, parallel-arm, active-controlled clinical trial that evaluated the safety and efficacy of 400mg of sparsentan, compared to 300mg of irbesartan, in 404 patients ages 18 years and up with IgAN and persistent proteinuria despite available ACE or ARB therapy, and is currently ongoing in the open label extension phase of the study. 66 Table of Contents The PROTECT Study protocol provided for an unblinded analysis of at least 280 patients to be performed after 36 weeks of treatment to evaluate the primary efficacy endpoint - the change in proteinuria (UPCR) at week 36 from baseline.
The decrease in cash provided was primarily due to the February 2021 issuance of stock through an underwritten public offering that provided $189.3 million, offset by net proceeds of $95.0 million from the March 2022 issuance of the 2029 Notes and repurchase of the 2025 Notes.
The increase in cash provided was due to the March 2023 issuance of common stock and pre-funded warrants through an underwritten public offering that provided $215.8 million in net proceeds, compared with net proceeds of $95.0 million from the March 2022 issuance of the 2029 Notes and repurchase of the 2025 Notes and $19.5 million in net proceeds from sales under the ATM Agreement in 2022.
The additional cohort was initiated to inform and refine formulation work for future development and commercial purposes and to further evaluate the dose response curve for pegtibatinase. In the fourth quarter of 2022, enrollment completed in the sixth and final cohort of the ongoing Phase 1/2 COMPOSE Study. We anticipate reporting additional data from COMPOSE in mid-2023.
In May 2023, we announced positive topline results from the sixth cohort of the Phase 1/2 COMPOSE Study, which was initiated to inform and refine formulation work for future development and commercial purposes and to further evaluate the dose response curve for pegtibatinase, and to further inform our pivotal development program to ultimately support potential approval of pegtibatinase for the treatment of HCU.
External service provider costs increased by $10.3 million, which included a $14.3 million increase in such costs for the development of pegtibatinase along with a $11.7 million increase in other general research and development costs, offset by a $15.8 million decrease in external service provider costs associated with the development of sparsentan as the program progresses through the development cycle.
External service provider costs increased by $11.0 million, which included a $14.3 million increase in such costs for the development of pegtibatinase along with a $12.5 million increase in other general research and development costs, offset by a $15.8 million decrease in external service provider costs associated with the development of sparsentan as the program progresses through the development cycle. 74 Table of Contents Selling, general and administrative expenses Selling, general and administrative expenses consist of salaries and bonuses, benefits, non-cash share-based compensation, legal and other professional fees, rent, depreciation and amortization, travel, insurance, business development, sales and marketing programs, and other operating expenses.
The license agreement will continue until neither party has any further payment obligations under the agreement and is expected to continue for approximately 10 to 20 years from the effective date.
For the year ended December 31, 2023, we capitalized $4.4 million to intangible assets for royalties owed on net sales of FILSPARI. The license agreement will continue until neither party has any further payment obligations under the agreement and is expected to continue for up to 20 years from the effective date.
Payments received under collaboration and licensing agreements may include non-refundable fees at the inception of the arrangements, milestone payments for specific achievements and royalties on the sale of products.
The calculation of the accrual for co-pay assistance is based on an estimate of claims and the estimated cost per claim associated with product that has been recognized as revenue. Payments received under collaboration and licensing agreements may include non-refundable fees at the inception of the arrangements, milestone payments for specific achievements and royalties on the sale of products.
With an estimated prevalence of up to 150,000 people in the United States and greater numbers in Europe and Asia, IgAN is the most common primary glomerular disease. Most patients are diagnosed between the ages of 16 and 35, with up to 40% progressing to end stage kidney disease within 15 years.
IgAN is characterized by hematuria, proteinuria, and variable rates of progressive renal failure. With an estimated prevalence of up to 150,000 people in the United States and greater numbers in Europe and Asia, IgAN is the most common primary glomerular disease.
As consideration for the license, we are required to make substantial payments upon the achievement of certain milestones, totaling up to $114.1 million, including a $23.0 million milestone payment to Ligand (and Bristol-Myers Squibb Company ("BMS")) that we plan to make in the first quarter of 2023, which was triggered upon the accelerated approval of FILSPARI in February 2023.
Through December 31, 2023, we have paid $41.4 million for contractual milestone payments under the Ligand License Agreement, which includes a $23.0 million milestone payment to Ligand (and Bristol-Myers Squibb Company ("BMS")) in March 2023 that was triggered upon the accelerated approval of FILSPARI in February 2023.
Additional sources of cash over this period include net revenues from sales of our products, the sale or maturity of investments in our portfolio of marketable debt securities, and certain earned and potential milestone payments associated with sparsentan in connection with our license and collaboration arrangement with CSL Vifor.
Sources of cash over this period include net revenues from sales of our products, the sale or maturity of investments in our portfolio of marketable debt securities, and certain earned and potential milestone payments. We anticipate achieving milestones with both FILSPARI and pegtibatinase that will result in us making net payments of approximately $50.0 million during the next 12 months.
Pending completion of the DUPLEX Study and data supportive of approval, we and CSL Vifor are targeting to submit by the end of 2023 a subsequent variation of sparsentan for the treatment of FSGS in Europe. If sparsentan receives marketing authorization in any of the licensed territories, CSL Vifor will be responsible for all commercialization activities in such licensed territories.
If sparsentan receives marketing authorization in any of the licensed territories covered by the exclusive license to CSL Vifor, CSL Vifor will be responsible for all commercialization activities in such licensed territories.
As of December 31, 2022, we have recognized approximately $7.5 million in research and development expenses related to the production of active pharmaceutical ingredient that could potentially support the commercial launch of FILSPARI.
Prior to the February 2023 FDA accelerated approval of FILSPARI (sparsentan), we recognized approximately $7.5 million in research and development expenses related to the production of active pharmaceutical ingredients to support the commercial launch of FILSPARI. For the year ended December 31, 2023, sales of FILSPARI primarily consisted of zero-cost inventories.