Biggest changeResults of Operations Comparison of the Years Ended December 31, 2022 and 2021 The following table summarizes our results of operations for the years ended December 31, 2022 and 2021: Year Ended December 31, 2022 2021 $ Change Revenues: Grant revenue $ 4,930 $ 15,186 $ (10,256 ) Collaboration revenue 48,579 3,070 45,509 Total revenues 53,509 18,256 35,253 Operating expenses: Research and development 47,593 64,526 (16,933 ) General and administrative 36,483 41,701 (5,218 ) Restructuring 11,630 — 11,630 Total operating expenses 95,706 106,227 (10,521 ) Loss from operations (42,197 ) (87,971 ) 45,774 Other income (expense): Interest income 1,106 346 760 Other income (expense), net (55 ) (395 ) 340 Interest expense related to the sale of future royalties (2,605 ) (1,940 ) (665 ) Loss on extinguishment of liability related to the sale of future royalties (3,581 ) - (3,581 ) Change in fair value of derivative liability 917 204 713 Total other income (expense), net (4,218 ) (1,785 ) (2,433 ) Net loss $ (46,415 ) $ (89,756 ) $ 43,341 Grant Revenue Year Ended December 31, 2022 2021 $ Change BARDA Contract (Tebipenem HBr) $ 2,178 $ 9,909 $ (7,731 ) NIAID Contract (SPR206) 1,736 808 928 DoD Agreement (SPR206) 1,016 4,469 (3,453 ) Total revenue $ 4,930 $ 15,186 $ (10,256 ) Grant revenue recognized during 2022 and 2021 consisted of the reimbursement of qualifying expenses incurred in connection with our various government awards.
Biggest changeResults of Operations Comparison of the Years Ended December 31, 2023 and 2022 The following table summarizes our results of operations for the years ended December 31, 2023 and 2022: Year Ended December 31, 2023 2022 $ Change Revenues: Grant revenue $ 7,046 $ 4,930 $ 2,116 Collaboration revenue - related party 95,802 46,076 49,726 Collaboration revenue 933 2,503 (1,570 ) Total revenues 103,781 53,509 50,272 Operating expenses: Research and development 51,440 47,593 3,847 General and administrative 25,554 36,483 (10,929 ) Impairment of long-term asset 5,306 — 5,306 Restructuring — 11,630 (11,630 ) Total operating expenses 82,300 95,706 (13,406 ) Income (loss) from operations 21,481 (42,197 ) 63,678 Other income (expense): Interest income 3,937 1,106 2,831 Other income (expense), net (14 ) (55 ) 41 Interest expense related to the sale of future royalties — (2,605 ) 2,605 Loss on extinguishment of liability related to the sale of future royalties — (3,581 ) 3,581 Change in fair value of derivative liability — 917 (917 ) Total other income (expense), net 3,923 (4,218 ) 8,141 Net income (loss) before income taxes 25,404 (46,415 ) 71,819 Income tax expense (2,598 ) — (2,598 ) Net income (loss) $ 22,806 $ (46,415 ) $ 69,221 81 Grant Revenue Year Ended December 31, 2023 2022 $ Change BARDA Contract (Tebipenem HBr) $ 4,361 $ 2,178 $ 2,183 NIAID Contract (SPR206) 2,685 1,736 949 DoD Agreement (SPR206) — 1,016 (1,016 ) Total revenue $ 7,046 $ 4,930 $ 2,116 Grant revenue recognized during 2023 and 2022 consisted of the reimbursement of qualifying expenses incurred in connection with our various government awards.
This is due to the numerous risks and uncertainties, including the following: • successful completion of clinical trials with safety, tolerability and efficacy profiles that are satisfactory to the FDA or any comparable foreign regulatory authority, including on account of the disruptive impacts of the COVID-19 pandemic; • receipt of marketing approvals from applicable regulatory authorities; • establishment of arrangements with third-party manufacturers to obtain manufacturing supply; • obtainment and maintenance of patent, trade secret protection and regulatory exclusivity, both in the United States and internationally, including our ability to maintain our license agreement with Meiji with respect to tebipenem HBr; • protection of our rights in our intellectual property portfolio; • launch of commercial sales our product candidates, if approved, whether alone or in collaboration with others; • acceptance of our product candidates, if approved, by patients, the medical community and third-party payors; • competition with other therapies; and • a continued acceptable safety profile of tebipenem HBr and our other product candidates, if approved.
This is due to the numerous risks and uncertainties, including the following: • successful completion of clinical trials with safety, tolerability and efficacy profiles that are satisfactory to the FDA or any comparable foreign regulatory authority, including on account of the disruptive impacts of the COVID-19 pandemic; • receipt of marketing approvals from applicable regulatory authorities; • establishment of arrangements with third-party manufacturers to obtain manufacturing supply; • obtainment and maintenance of patent, trade secret protection and regulatory exclusivity, both in the United States and internationally, including our ability to maintain our license agreement with Meiji with respect to tebipenem HBr; • protection of our rights in our intellectual property portfolio; • launch of commercial sales of our product candidates, if approved, whether alone or in collaboration with others; • acceptance of our product candidates, if approved, by patients, the medical community and third-party payors; • competition with other therapies; and • a continued acceptable safety profile of our product candidates, if approved.
Financing Activities Net cash used in financing activities for the year ended December 31, 2022 was $29.6 million, consisting primarily of the $54.5 million repayment of our liability related to the sales of future royalties, partially offset by net proceeds of $14.2 million from the sale of common stock under our “at-the-market” offering program Sales Agreement, proceeds of $9.0 million related to our GSK SPA, and proceeds of $0.4 million from the exercise of employee stock options.
Net cash used in financing activities for the year ended December 31, 2022 was $29.6 million, consisting primarily of the $54.5 million repayment of our liability related to the sales of future royalties, partially offset by net proceeds of $14.2 million from the sale of common stock under our “at-the-market” offering program Sales Agreement, proceeds of $9.0 million related to our GSK SPA, and proceeds of $0.4 million from the exercise of employee stock options.
If we are unable to raise additional funds through equity or debt 82 financings or other arrangements when needed, we may be required to delay, limit, reduce or terminate our research, product development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.
If we are unable to raise additional funds through equity or debt financings or other arrangements when needed, we may be required to delay, limit, reduce or terminate our research, product development or future commercialization efforts or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.
We measure all share-based options granted to employees and directors based on the fair value on the date of grant 77 using the Black-Scholes option-pricing model, and we recognize compensation expense of those awards over the requisite service period, which is generally the vesting period of the respective award.
We measure all share-based options granted to employees and directors based on the fair value on the date of grant using the Black-Scholes option-pricing model, and we recognize compensation expense of those awards over the requisite service period, which is generally the vesting period of the respective award.
Until such time, if ever, as we can generate substantial product revenue, we expect to finance our operations through a combination of equity offerings, debt financings, government funding, collaborations, strategic alliances and marketing, distribution or licensing arrangements.
Until such time, if ever, as we can generate substantial product revenue, we expect to finance our operations through a combination of equity offerings, debt financings, government funding, collaborations, strategic alliances and marketing, distribution or 85 licensing arrangements.
To date, there have not been any material adjustments to our prior estimates of accrued research and development expenses. Share-Based Compensation We issue stock-based awards to employees and directors in the form of stock options and restricted stock units.
To date, there have not been any material adjustments to our prior estimates of accrued research and development expenses. 80 Share-Based Compensation We issue stock-based awards to employees and directors in the form of stock options and restricted stock units.
License fees and other costs incurred after a product candidate has been designated and that are directly related to the 74 product candidate are included in direct research and development expenses for that program. License fees and other costs incurred prior to designating a product candidate are included in early stage research programs.
License fees and other costs incurred after a product candidate has been designated and that are directly related to the product candidate are included in direct research and development expenses for that program. License fees and other costs incurred prior to designating a product candidate are included in early stage research programs.
Restructuring In light of our decision to suspend commercialization activities for tebipenem HBr and our strategic restructuring as announced in May 2022, our operating expenses were substantially reduced during the year ended December 31, 2022.
Restructuring In light of our prior decision to suspend commercialization activities for tebipenem HBr and our strategic restructuring, as announced in May 2022, our operating expenses were substantially reduced during the year ended December 31, 2022.
If we fail to raise capital or enter into such agreements as, and when, needed, we may have to significantly delay, scale back or discontinue the development and commercialization of one or more of our product candidates. 73 Because of the numerous risks and uncertainties associated with pharmaceutical product development, we are unable to accurately predict the timing or amount of increased expenses or when or if we will be able to achieve or maintain profitability.
If we fail to raise capital or enter into such agreements as, and when, needed, we may have to significantly delay, scale back or discontinue the development and commercialization of one or more of our product candidates. 76 Because of the numerous risks and uncertainties associated with pharmaceutical product development, we are unable to accurately predict the timing or amount of increased expenses or when or if we will be able to achieve or maintain profitability.
The related costs incurred by us are included in research and development expense in our consolidated statements of operations and comprehensive loss. 76 Collaboration Agreements For collaboration agreements with a third party, to determine the appropriate statement of operations classification of the recognized funding, we first assess whether the collaboration arrangement is within the scope of the accounting guidance for collaboration arrangements.
The related costs incurred by us are included in research and development expense in our consolidated statements of operations and comprehensive loss. 79 Collaboration Agreements For collaboration agreements with a third party, to determine the appropriate statement of operations classification of the recognized funding, we first assess whether the collaboration arrangement is within the scope of the accounting guidance for collaboration arrangements.
We expect to continue to incur research and development and general and administrative expenses in 2023 to support activities under our subsequently announced GSK License Agreement that closed in November 2022.
We expect to continue to incur research and development and general and administrative expenses in 2024 to support activities under our subsequently announced GSK License Agreement that closed in November 2022.
Under an agreement we entered into with PBB, we are obligated to make milestone payments of up to $5.8 million upon the achievement of specified clinical milestones and a payment of £5.0 million ($6.0 million as of December 31, 2022) upon the achievement of a specified commercial milestone for SPR206.
Under an agreement we entered into with PBB, we are obligated to make milestone payments of up to $5.8 million upon the achievement of specified clinical milestones and a payment of £5.0 million ($6.4 million as of December 31, 2023) upon the achievement of a specified commercial milestone for SPR206.
Nonrefundable advance payments we make for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses. The prepaid amounts are expensed as the related goods are delivered or the services are performed.
We expense research and development costs as incurred. Nonrefundable advance payments we make for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses. The prepaid amounts are expensed as the related goods are delivered or the services are performed.
We believe that our existing cash and cash equivalents will enable us to fund our operating expenses and capital expenditure requirements for at least 12 months from the issuance of the financial statements included in this report. Based on our current operating plans, we believe that our cash runway will be sufficient to fund us beyond 2024.
We believe that our existing cash and cash equivalents will enable us to fund our operating expenses and capital expenditure requirements for at least 12 months from the issuance of the financial statements included in this report. Based on our current operating plans, we believe that our cash runway will be sufficient to fund us into late 2025.
Grant Revenue We expect that a portion of our revenue for the next few years will continue to be derived from payments under our government awards that we have currently entered into and that we may enter into in the future. Collaboration Revenue Collaboration revenue relates to our agreements with Everest, Pfizer and GSK.
Grant Revenue We expect a portion of our revenue for the next few years will continue to be derived from payments under our active government awards and any awards that we may enter into in the future. Collaboration Revenue Collaboration revenue relates to our agreements with Everest, Pfizer and GSK.
To develop this model, we applied significant judgement in the determination of the significant assumptions relating to forecasted future revenues, development time lines, the discount rate, and probabilities of technical and regulatory success. We developed the estimated standalone selling price for the research and development services using a discounted cash flow model.
To develop this model, we applied significant judgment in the determination of the significant assumptions relating to forecasted future revenues, development timelines, the discount rate, and probabilities of technical and regulatory success. We developed the estimated standalone selling price for the research and development services using a discounted cash flow model.
Beyond this point we will need additional funding, which primarily consist of raising additional capital through some combination of equity or debt financings, potential new collaborations, additional grant funding and/or reducing cash expenditures. If we are not able to secure adequate additional funding, we plan to make reductions in spending.
Beyond this point we will need additional funding, which we expect will primarily consist of raising additional capital through some combination of equity or debt financings, potential new collaborations or additional grant funding. If we are not able to secure adequate additional funding, we plan to make reductions in spending.
If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or grant licenses on terms that may not be favorable to us. The COVID-19 pandemic has resulted in ongoing volatility in financial markets.
If we raise additional funds through collaborations, strategic alliances or marketing, distribution or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or grant licenses on terms that may not be favorable to us. There is ongoing volatility in financial markets.
Contractual Obligations and Commitments The following table summarizes our contractual obligations as of December 31, 2022 and the effects that such obligations are expected to have on our liquidity and cash flows in future periods: Payments Due by Period Total Less Than 1 Year 1 to 3 Years 4 to 5 Years More than 5 Years (in thousands) Operating lease commitments (1) 8,266 1,690 5,420 1,156 — Total $ 8,266 $ 1,690 $ 5,420 $ 1,156 $ — (1) Reflects payments due for our lease of office space under an operating lease agreement that expires in 2027.
Contractual Obligations and Commitments The following table summarizes our contractual obligations as of December 31, 2023 and the effects that such obligations are expected to have on our liquidity and cash flows in future periods: Payments Due by Period Total Less Than 1 Year 1 to 3 Years 4 to 5 Years More than 5 Years (in thousands) Operating lease commitments (1) 6,576 1,718 4,858 1,156 — Total $ 6,576 $ 1,718 $ 4,858 $ 1,156 $ — (1) Reflects payments due for our lease of office space under an operating lease agreement that expires in 2027.
As of December 31, 2022, we also had federal and state research and development tax credit carryforwards of $11.5 million and $2.8 million, respectively, which begin to expire in 2033 and 2028, respectively. We have recorded a full valuation allowance against our net deferred tax assets at each balance sheet date.
As of December 31, 2023, we also had federal and state research and development tax credit carryforwards of $6.0 million and $2.1 million, respectively, which begin to expire in 2033 and 2028, respectively. We have recorded a full valuation allowance against our net deferred tax assets at each balance sheet date.
To date, we have funded our operations with payments received under license and collaboration agreements and funding from government contracts, and mostly from the proceeds of multiple common stock offerings. As of December 31, 2022, we had cash and cash equivalents of $109.1 million.
To date, we have funded our operations with payments received under license and collaboration agreements and funding from government contracts, and from the proceeds of multiple common stock offerings. As of December 31, 2023, we had cash and cash equivalents of $76.3 million.
Restructuring We made estimates and judgments regarding the amount and timing of our restructuring expense and liability, including one-time termination benefits and other exit costs accounted for upon the announcement of our restructuring in May 2022. Restructuring charges are reflected in our consolidated statements of income.
We have also granted certain awards with performance-based criteria. Restructuring We made estimates and judgments regarding the amount and timing of our restructuring expense and liability, including one-time termination benefits and other exit costs accounted for upon the announcement of our restructuring in May 2022. Restructuring charges are reflected in our consolidated statements of income.
During the year ended December 31, 2022, direct costs related to tebipenem HBr included $6.6 million paid to Meiji, as a percentage of certain amounts received from any sublicensees, out of the $7.5 million we are obligated to pay under the Meiji License.
During the years ended December 31, 2023 and 2022, direct costs related to tebipenem HBr included $0.9 million and $6.6 million paid to Meiji, respectively, as a percentage of certain amounts received from any sublicensees, out of the $7.5 million we were obligated to pay under the Meiji License.
Total other expense for the year ended December 31, 2022 included $2.6 million in interest expense related to the sale of future royalties, $3.6 million in loss on extinguishment of liability related to the sale of future royalties and net immaterial changes primarily due to fluctuations in unrealized foreign currency gains, offset by a $0.9 million net change in derivative liability and $1.1 million in interest income.
Total other expense for the year ended December 31, 2022 included $2.6 million in interest expense related to the sale of future royalties, $3.6 million in loss on extinguishment of liability related to the sale of future royalties and net immaterial changes primarily due to fluctuations in unrealized foreign currency gains, offset by a $0.9 million net change in derivative liability and $1.1 million in interest income. 83 Liquidity and Capital Resources Since our inception, we have incurred significant operating losses.
Liquidity and Capital Resources Since our inception, we have incurred significant operating losses. We have recognized revenue to date from funding arrangements with the DoD, NIAID, CARB-X and BARDA and our license agreements with Everest, Pfizer and GSK. We have not yet commercialized any of our product candidates and we may not generate revenue from sales of any product candidates.
We have recognized revenue to date from funding arrangements with the DoD, NIAID, CARB-X and BARDA, the GSK License Agreement and our license agreements with Everest and Pfizer. We have not yet commercialized any of our product candidates and we may not generate revenue from sales of any product candidates.
Personnel-related costs for the years ended December 31, 2022 and 2021 included share-based compensation expense of $5.4 million and $5.3 million, respectively. The decrease in professional and consultant fees of $3.8 million was primarily due to decreased commercial operation expenses related to our strategic restructuring, partially offset by legal expenses.
Personnel-related costs for the years ended December 31, 2023 and 2022 included share-based compensation expense of $5.3 million and $5.4 million, respectively. The decrease in professional and consultant fees of $4.0 million was primarily due to decreased commercial operation expenses, offset by legal and consulting expenses incurred during the year ended December 31, 2023.
Under our license agreement with Meiji, we are obligated (i) to make future milestone payments of up to $1.0 million upon the achievement of specified clinical and regulatory milestones for tebipenem HBr, (ii) to pay royalties, on a product-by-product and country-by-country basis, of a low single-digit percentage based on net sales of products licensed under the agreement and (iii) to pay to Meiji a low double-digit percentage of any sublicense fees received by us up to $7.5 million, of which we paid $6.6 million in the fourth quarter of 2022.
Under our license agreement with Meiji, we are obligated (i) to make future milestone payments of up to $1.0 million upon the achievement of specified clinical and regulatory milestones for tebipenem HBr and (ii) to pay royalties, on a product-by-product and country-by-country basis, of a low single-digit percentage based on net sales of products licensed under the agreement.
The decrease in personnel-related costs of $3.7 million was primarily due to decreased research and development headcount costs related to our strategic restructuring. Personnel-related costs for the years ended December 31, 2022 and 2021 included share-based compensation expenses of $3.7 million and $4.2 million, respectively. Facility-related and other costs primarily reflect costs related to supporting our research and development staff.
Personnel-related costs for the years ended December 31, 2023 and 2022 included share-based compensation expenses of $2.7 million and $3.7 million, respectively. 82 Facility-related and other costs primarily reflect costs related to supporting our research and development staff.
Overview We are a multi-asset, clinical-stage biopharmaceutical company focused on identifying, developing and commercializing novel treatments for bacterial infections, including MDR bacterial infections, and rare diseases. Our lead product candidate, SPR720, is an oral antimicrobial agent in development for the treatment of NTM pulmonary disease, a rare orphan disease, where treatment failure is common, and no approved therapies exist.
Overview We are a multi-asset, clinical-stage biopharmaceutical company focused on identifying and developing novel treatments for rare diseases and and diseases caused by MDR bacterial infections with high unmet need. Our wholly-owned lead product candidate, SPR720, is an oral antimicrobial agent in development for the treatment of NTM pulmonary disease, a rare orphan disease.
The state NOLs begin to expire in 2033 and will expire at various dates through 2039. In addition, as of December 31, 2022, we had foreign net operating loss carryforwards of $4.6 million, which may be available to offset future income tax liabilities and do not expire.
In addition, as of December 31, 2023, we had foreign net operating loss carryforwards of $4.6 million, which may be available to offset future income tax liabilities and do not expire.
General and Administrative Expenses Year Ended December 31, 2022 2021 $ Change Personnel related (including share-based compensation) $ 20,433 $ 22,241 $ (1,808 ) Professional and consultant fees 12,140 15,933 (3,793 ) Facility related and other 3,910 3,527 383 Total general and administrative expenses $ 36,483 $ 41,701 $ (5,218 ) The decrease in personnel-related costs of $1.8 million was primarily a result of decreased headcount costs in our commercial and general and administrative functions as a result of our strategic restructuring.
General and Administrative Expenses Year Ended December 31, 2023 2022 $ Change Personnel related (including share-based compensation) $ 15,324 $ 20,433 $ (5,109 ) Professional and consultant fees 8,151 12,140 (3,989 ) Facility related and other 2,079 3,910 (1,831 ) Total general and administrative expenses $ 25,554 $ 36,483 $ (10,929 ) The decrease in personnel-related costs of $5.1 million was primarily a result of decreased headcount costs in our commercial and general and administrative functions as a result of our strategic restructuring.
Direct costs related to our SPR206 program decreased by $1.8 million during the year ended December 31, 2022, primarily due to decreased clinical activity during the period. We expect to continue to incur direct costs related to SPR206 as we progress preclinical and clinical activities.
Direct costs related to our SPR206 program decreased by $1.2 million during the year ended December 31, 2023, primarily due to decreased preclinical activity and expenses associated with formulation development, manufacturing process and manufacturing of clinical trial material during the period. We expect to continue to incur direct costs related to SPR206 as we progress preclinical and clinical activities.
As of December 31, 2022, we had federal and state net operating loss carryforwards of $291.9 million and $282.9 million, respectively, which may be available to offset future income tax liabilities. The federal NOLs of $73.0 million will expire at various dates from 2033 to 2037 and approximately $218.9 million can be carried forward indefinitely.
As of December 31, 2023, we had federal and state net operating loss carryforwards of $94.7 million and $90.9 million, respectively, which may be available to offset future income tax liabilities. All federal NOLs can be carried forward indefinitely. The state NOLs begin to expire in 2033 and will expire at various dates through 2043.
Since our inception in 2013, we have focused substantially all of our efforts and financial resources on organizing and staffing our company, business planning, raising capital, acquiring and developing product and technology rights, building our intellectual property portfolio and conducting research and development activities for our product candidates.
Since our inception in 2013, we have focused substantially all of our efforts and financial resources on acquiring and developing product and technology rights, building our intellectual property portfolio and conducting research and development activities for our product candidates. We do not have any products approved for sale and have not generated any revenue from product sales.
The assumptions to develop the estimated standalone selling price for the related research and development services include estimates of costs to be incurred to fulfill its obligations associated with the performance of the research and development services, plus a reasonable margin.
The assumptions to develop the estimated standalone selling price for the related research and development services include estimates of costs to be incurred to fulfill its obligations associated with the performance of the research and development services, plus a reasonable margin. When an arrangement contains payment terms that are extended beyond one year, a significant financing component may exist.
We expect to continue to incur significant expenses and increasing operating losses for at least the next several years. We believe that our existing cash and cash equivalents will enable us to fund our operating expenses and capital expenditure requirements for at least 12 months from the issuance of the financial statements included in this report.
We believe that our existing cash and cash equivalents will enable us to fund our operating expenses and capital expenditure requirements for at least 12 months from the issuance of the financial statements included in this report. Based on our current operating plans, we believe that our cash runway will be sufficient to fund us into late 2025.
Changes in deferred revenue are primarily related to our license agreement with GSK. Investing Activities Net cash provided by investing activities for the year ended December 31, 2022 was $33.8 million, primarily related to the maturities of marketable securities of $60.8 million, offset by purchases of marketable securities of $27.0 million.
Net cash provided by investing activities for the year ended December 31, 2022 was $33.8 million, primarily related to the maturities of marketable securities of $60.8 million, offset by purchases of marketable securities of $27.0 million. 84 Financing Activities Cash provided by financing activities during the year ended December 31, 2023 was $0.2 million, due to the $0.2 million net sales of common stock under our Sales Agreement.
As of December 31, 2022, we had cash and cash equivalents of $109.1 million.
As of December 31, 2023, we had cash and cash equivalents of $76.3 million.
Research and Development Expenses Year Ended December 31, 2022 2021 $ Change Direct research and development expenses by program: SPR720 $ 2,793 $ 2,156 $ 637 Tebipenem HBr 17,064 28,882 (11,818 ) SPR206 4,424 6,249 (1,825 ) Unallocated expenses: Personnel related (including share-based compensation) 18,918 22,667 (3,749 ) Facility related and other 4,394 4,572 (178 ) Total research and development expenses $ 47,593 $ 64,526 $ (16,933 ) Direct costs related to our SPR720 program increased by $0.6 million during 2022 compared to 2021, due to increased clinical and preclinical activity during the period related to our Phase 2a clinical trial of SPR720, which we initiated in the fourth quarter of 2022.
Research and Development Expenses Year Ended December 31, 2023 2022 $ Change Direct research and development expenses by program: SPR720 $ 13,031 $ 2,793 $ 10,238 Tebipenem HBr 16,695 17,064 (369 ) SPR206 3,240 4,424 (1,184 ) Unallocated expenses: Personnel related (including share-based compensation) 13,788 18,918 (5,130 ) Facility related and other 4,686 4,394 292 Total research and development expenses $ 51,440 $ 47,593 $ 3,847 Direct costs related to our SPR720 program increased by $10.2 million during 2023 compared to 2022, due to increased clinical activity during the period related to our ongoing Phase 2a clinical trial of SPR720, which we initiated in the fourth quarter of 2022.
The decrease in revenue during 2022 was primarily due to a decrease of $7.7 million in funding under our BARDA contract for tebipenem HBr, a decrease of $3.5 million in funding under our DoD agreement relating to SPR206, partially offset by an increase of $0.9 million in qualified expenses incurred under our NIAID award relating to SPR206. 78 Collaboration Revenue During the year ended December 31, 2022 we recognized collaboration revenue of $46.1 million related to our agreement with GSK, $1.8 million related to our agreement with Pfizer, and $0.7 million related to milestones earned under our agreement with Everest.
The increase in revenue during 2023 was primarily due to an increase of $2.2 million in funding under our BARDA contract for tebipenem HBr and an increase of $0.9 million in qualified expenses incurred under our NIAID award relating to SPR206, partially offset by a decrease funding of $1.0 million under our DoD agreement relating to SPR206.
Net cash used in operating activities for the year ended December 31, 2021 was $64.3 million, primarily resulting from our net loss of $89.8 million, adjusted for net non-cash items of $12.5 million (primarily stock-based compensation, interest expense associated with the sale of future royalties and depreciation and amortization expense).
Net cash used in operating activities for the year ended December 31, 2022 was $7.7 million, primarily resulting from our net loss of $46.4 million, adjusted for net non-cash items of $16.6 million (primarily stock-based compensation, interest expense associated with the sale of future royalties, loss on extinguishment of liability related to the sale of future royalties, change in the value of derivative liabilities and depreciation and amortization expense).
During the year ended December 31, 2021 we recognized collaboration revenue of $1.8 million related to our agreement with Pfizer consisting primarily of the delivery of the license for SPR206 in ex-U.S. and ex-Asia territories and $1.3 million related to milestones earned under our agreement with Everest.
During the year ended December 31, 2022 we recognized collaboration revenue of $1.8 million related to our agreement with Pfizer and $0.7 million related to milestones earned under our agreement with Everest.
Tebipenem HBr is designed to be the first broad-spectrum oral carbapenem-class antibiotic for use to treat certain bacterial infections that cause cUTIs, including pyelonephritis, caused by certain microorganisms, in adult patients who have limited oral treatment options. SPR206 is an IV-administered agent being developed as an innovative option to treat MDR Gram-negative bacterial infections in the hospital setting.
Tebipenem HBr is designed to be the first oral carbapenem-class antibiotic for use to treat cUTIs, including pyelonephritis, caused by certain microorganisms, in adult patients who have limited oral treatment options. SPR206 is an IV-administered antibiotic that has shown activity in preclinical studies against MDR Gram-negative pathogens, including carbapenem-resistant Enterobacterales, Acinobacter baumannii and Pseudomonas aeruginosa .
At this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the preclinical and clinical development of any of our product candidates. The successful development and commercialization of our product candidates is highly uncertain.
Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. 77 At this time, we cannot reasonably estimate or know the nature, timing and costs of the efforts that will be necessary to complete the preclinical and clinical development of any of our product candidates.
Income Taxes Since our inception, we have not recorded any income tax benefits for the net losses we have incurred in each year or for our earned research and development tax credits, as we believe, based upon the weight of available evidence, that it is more likely than not that all of our net operating loss carryforwards and tax credits will not be realized.
Other Income (Expense), Net Other income (expense), net, consists of insignificant amounts of miscellaneous income, as well as the loss on extinguishment of liability related to the sale of future royalties, the change in the fair value of our derivative liability, realized and unrealized gains and losses from foreign currency-denominated cash balances, vendor payables and receivables related to the Australian research and development tax incentive. 78 Income Taxes We have not recorded any income tax benefits for the net losses we have incurred in each year or for our earned research and development tax credits, as we believe, based upon the weight of available evidence, that it is more likely than not that all of our net operating loss carryforwards and tax credits will not be realized.
In connection with the GSK License Agreement, an affiliate of GSK purchased 7,450,000 shares of the Company’s common stock at a purchase price of approximately $1.20805 per share for an aggregate purchase price of $9.0 million. • During the year ended December 31, 2022, we sold 5,963,294 shares of our common stock under the Sales Agreement at an average price of approximately $2.46 per share for aggregate gross proceeds of approximately $14.7 million prior to deducting sales commissions.
Under the terms of the GSK License Agreement, we received a $30.0 million development milestone payment during the third quarter of 2023. • During the year ended December 31, 2023, we sold 144,476 shares of our common stock under the Sales Agreement at an average price of approximately $1.58 per share for aggregate gross proceeds of approximately $0.2 million prior to deducting sales commissions.
We believe that SPR720, if successfully developed and approved, has the potential to be the first approved oral agent for NTM pulmonary infection. Our partnership-directed programs consist of tebipenem HBr and SPR206, which through our business development efforts, each have partnership relationships supporting their ongoing development.
We believe that SPR720, if successfully developed and approved, has the potential to be the first approved oral agent for NTM pulmonary disease in treatment-naïve and treatment-experienced and non-refractory patients. Our partner-directed programs consist of tebipenem HBr and SPR206.
Restructuring expenses for the period were primarily comprised of $8.6 million of severance and other employee costs and $3.0 million of discontinuation costs such as contract termination fees and lease impairment expenses. For further information, refer to Note 10 – Restructuring to the Financial Statements.
Restructuring During the year ended December 31, 2022, we incurred restructuring expenses of $11.6 million related to our strategic restructuring that we announced in May 2022. Restructuring expenses for the period were primarily comprised of $8.6 million of severance and other employee costs and $3.0 million of discontinuation costs such as contract termination fees and lease impairment expenses.
Accrued Research and Development Expenses As part of the process of preparing our consolidated financial statements, we are required to estimate our accrued research and development expenses.
Judgment is used in determining: (1) whether the financing component in a license agreement is significant and, if so, (2) the discount rate used in calculating the significant financing component. Accrued Research and Development Expenses As part of the process of preparing our consolidated financial statements, we are required to estimate our accrued research and development expenses.
Our ability to generate product revenue sufficient to achieve profitability will depend heavily on the successful development and eventual commercialization of one or more of our product candidates. As of December 31, 2022, we had an accumulated deficit of $413.9 million, and cash and cash equivalents of $109.1 million.
We have experienced net losses and significant cash outflows from cash used in operating activities since our inception through 2022. Our ability to generate product revenue sufficient to achieve profitability will depend heavily on the successful development and eventual commercialization of one or more of our product candidates.
Net cash provided by changes in our operating assets and liabilities was $12.9 million and consisted primarily of a $10.6 million net increase in deferred revenue, an increase of $2.1 million in accrued expenses and accounts payable, a $2.8 million increase in prepaid expenses and other current assets and a $3.8 million net decrease in receivables related to our tax incentive receivables and government awards and a $0.3 million net increase in other assets.
Net cash used by our operating assets and liabilities was $70.4 million and consisted primarily of a $95.7 million increase in our related party collaboration receivable, $29.0 million net increase in deferred revenue and a decrease of $1.7 million in accrued expenses and accounts payable.
The period of performance for this new option extends through December 31, 2025 and does not change the total amount of committed funding or potential contract value. 80 Cash Flows The following table summarizes our sources and uses of cash for the years ended December 31, 2022 and 2021: Year Ended December 31, 2022 2021 Cash used in operating activities $ (7,731 ) $ (64,347 ) Cash provided by investing activities 33,807 7,672 Cash provided by (used in) financing activities (29,553 ) 84,050 Net increase (decrease) in cash and cash equivalents $ (3,477 ) $ 27,375 Operating Activities Net cash used in operating activities for the year ended December 31, 2022 was $7.7 million, primarily resulting from our net loss of $46.4 million, adjusted for net non-cash items of $16.6 million (primarily stock-based compensation, interest expense associated with the sale of future royalties, loss on extinguishment of liability related to the sale of future royalties, change in the value of derivative liabilities and depreciation and amortization expense).
Cash Flows The following table summarizes our sources and uses of cash for the years ended December 31, 2023 and 2022: Year Ended December 31, 2023 2022 Cash used in operating activities $ (32,995 ) $ (7,731 ) Cash provided by investing activities — 33,807 Cash provided by (used in) financing activities 221 (29,553 ) Net increase (decrease) in cash and cash equivalents $ (32,774 ) $ (3,477 ) Operating Activities Net cash used in operating activities for the year ended December 31, 2023 was $33.0 million, primarily resulting from our net income of $22.8 million, adjusted for net non-cash items of $14.6 million (primarily due to stock-based compensation and asset impairment).
In addition, we expect to incur additional costs associated with our continued operation as a public company.
Funding Requirements We expect our expenses to increase in connection with our ongoing activities, particularly as we advance our clinical programs and prepare for possible commercialization of one or more of our product candidates. In addition, we expect to incur additional costs associated with our continued operation as a public company.
Other Income (Expense) Interest Income (Expense) Interest income (expense) consists of interest expense related to the sale of future royalties and interest earned on our cash equivalents, which are primarily invested in money market accounts, as well as interest earned on our investments in marketable securities that we held during the years ended December 31, 2022 and 2021. 75 Other Income (Expense), Net Other income (expense), net, consists of insignificant amounts of miscellaneous income, as well as the loss on extinguishment of liability related to the sale of future royalties, the change in the fair value of our derivative liability, realized and unrealized gains and losses from foreign currency-denominated cash balances, vendor payables and receivables from the Australian research and development tax incentive.
As of December 31, 2023, all of these costs were paid. Other Income (Expense) Interest Income (Expense) Interest income (expense) consists of interest expense related to the sale of future royalties and interest earned on our cash equivalents, which are primarily invested in money market accounts, as well as interest earned on our investments in marketable securities.
We believe that our novel product candidates, if successfully developed and approved, would have meaningful patient impacts and significant commercial applications for the treatment of bacterial infections, including MDR infections, in both the community and hospital settings.
We are developing SPR206 to treat MDR Gram-negative bacterial infections in the hospital setting. We believe that our novel product candidates, if successfully developed and approved, could provide meaningful benefits to patients suffering from serious rare orphan diseases and life-threatening bacterial infections, in both the community and hospital settings.
We expect to continue to incur direct costs related to SPR720 as we progress preclinical and clinical activities. During the year ended December 31, 2022, we did not record a reduction to direct costs related to our SPR720 program related to activities funded by Gates MRI.
We expect to continue to incur direct costs related to SPR720 as we continue to screen and enroll patients and progress clinical activities.
Below is a summary of some of the items impacting our liquidity and capital resources in 2022: • On May 3, 2022, we implemented a strategic restructuring initiative and corresponding reduction in workforce.
Below is a summary of some of the items impacting our liquidity and capital resources in 2023: • In July 2023, we received written agreement from the FDA, under a SPA, on the design and size of PIVOT-PO, a pivotal Phase 3 clinical trial of tebipenem HBr in patients with cUTI, including AP.