Thank you, Bob. Please turn to Slide 22. We're focused on improving the financial health and performance of Novavax to enable long-term value creation. Today, we outline more detailed plans to deliver on this vision. To begin, I'll share a few of the key themes from the second quarter of 2024 and look towards full year 2024 and beyond.
For the second quarter of 2024, Novavax recorded total revenue of $415 million, consisting primarily of $391 million from the GAAP revenue recognition for the $500 million upfront payment from Sanofi received fully in the second quarter. The remaining $119 million from the upfront milestone payment will be allocated over the transition services period through 2026. We estimate full year revenue recognition for this upfront payment to be approximately $400 million for 2024 and the remaining $100 million evenly split across 2025 and 2026.
We have incorporated this GAAP revenue recognition into our full year 2024 guidance.
As we continue to transform Novavax into a more lean and agile organization, we reduced our second quarter 2024 combined R&D and SG&A by 34% compared to prior year. When excluding Sanofi transaction cost for the period, we saw a decrease of 43%.
As we look forward to the full year 2024, we are reiterating our targeted guidance for combined R&D and SG&A expenses of between $700 million and $750 million as we continue to resize our organization. Novavax is prepared to initiate an additional cost reduction program to further reduce combined R&D and SG&A expenses, a portion of which we expect to be reimbursed by Sanofi under the agreement.
For 2025 and net of reimbursement, we're targeting non-GAAP combined R&D and SG&A of below $450 million. We ended the second quarter of 2024 with cash and accounts receivable of approximately $1.1 billion. We believe the Sanofi agreement provides for a multi-billion dollar cash flow over time.
During the second quarter of 2024, we received approximately $570 million in cash payments that further improved our financial position.
Importantly, we are prioritizing the completion of our APAs, enabling a reduction to Novavax's commercial operating activities and complexity as a means to further reduce our costs. Please turn to Slide 23 for a more detailed review of our second quarter 2024 results.
For the second quarter of 2024, we recorded total revenue of $415 million compared to $424 million in the same period in 2023.
Our product sales of $20 million in the second quarter of 2024 were primarily related to the expiration of certain EPA purchase rights.
Our cost of sales for the second quarter of 2024 were $46 million as compared to $56 million for the same period in 2023. These periods include $24 million and $31 million, respectively, related to excess, obsolete and expired inventory, losses on firm purchase commitments and unutilized manufacturing capacity.
As previously noted, for the second quarter of 2024, Novavax's combined R&D and SG&A of $208 million reflects a 34% reduction from the same period in 2023.
Excluding the $31 million in Sanofi transaction costs, our second quarter 2024 combined R&D and SG&A was approximately flat to the first quarter of 2024. Please turn to Slide 24. The Sanofi agreement provides for a multi-billion dollar potential across upfront equity investments, milestones and royalties. The anticipated present value of the royalties on Sanofi's Nuvaxovid, flu/COVID combination products and new vaccines with Matrix-M are expected to be the largest individual component of value from this transaction. Of note, this agreement reflects just 1 of the 4 pillars of value for Novavax, and given its many layers, it's worth another review to be better appreciated. Please turn to Slide 25. The COVID-19 and Sanofi COVID/flu combination-related terms include the potential for up to approximately $1.3 billion in one-time milestone cash payments and equity investment.
During the second quarter of 2024, the initial cash payment included $500 million upfront and approximately $70 million equity investment in Novavax stock. Near-term Nuvaxovid COVID-19 milestones of $350 million and COVID/flu combination milestones of $350 million should provide important cash flow to the company.
We expect to complete database lock in the fourth quarter of 2024, which would enable earning the first $50 million milestone. Revenue recognition for this milestone will be allocated over the transition services period through 2026. All other milestones under the agreement will be recognized in the period when earned. The $175 million BLA milestone is anticipated to align to our BLA PDUFA date and approval, which is presently targeted for April 2025. The 2 $25 million authorization transfer milestones are expected to follow as we enable Sanofi to commercialize Nuvaxovid in the U.S. and Europe for the 2025/2026 vaccination season. The $75 million technology transfer milestone is expected to follow completion of our transition services obligations that we currently estimate to occur in late 2026.
For the Sanofi flu/COVID program, there are 2 milestones totaling $350 million related to the development and first commercial sale. Sanofi recently noted on their earnings call that they expect to start clinical trial manufacturing activities in 2024.
We are working to support Sanofi in these efforts and await more visibility into the potential time lines.
In addition, Novavax is eligible to receive tiered royalties on net sales from COVID-19 mono and COVID combination products. This enables Novavax's meaningful participation in future economics from the current and future products under this agreement.
New vaccines developed with Matrix-M by Sanofi create a broad opportunity to advance this technology and provide Novavax with multiple revenue generation opportunities.
We are eligible to receive up to $210 million in milestones plus ongoing royalties for 2 decades from the time of launch for each new vaccine developed utilizing Novavax's Matrix-M adjuvant.
For example, if Sanofi developed 5 products with our Matrix-M, each with $1 billion in sales, this represents hundreds of millions in royalties per year plus over $1 billion in one-time milestones. Novavax will support Sanofi as it prepares to advance all programs associated with this agreement, and Novavax will be eligible for cost reimbursement across a host of spend categories. Please turn to Slide 26. We're committed to creating a more lean and agile organization to align with the company's market opportunities. To advance that goal, for 2024, we are reiterating our targeted combined R&D and SG&A expense guidance of $700 million to $750 million.
We are currently at the high end of the range when accounting for the Sanofi transaction costs, and we will continue to push to find savings in our cost structure as the year progresses. Novavax is prepared to initiate an additional cost reduction program to reduce combined R&D plus SG&A expenses, a portion of which we expect to be reimbursed by Sanofi under the agreement during 2025 and 2026.
For 2025 and net of expected reimbursement, we expect our non-GAAP combined R&D and SG&A to be below $450 million. By 2026, we expect to drive down combined R&D and G&A expenses to below $350 million.
In addition, as we assume a secondary role in commercial markets, this enables the reduction of commercial and supply chain costs.
We are actively exploring the sale of our Czech Republic manufacturing facility, which could both provide cash proceeds and reduction to our ongoing operating cost. Please turn to Slide 27.
Now turning to financial guidance that we have updated to incorporate the GAAP revenue recognition for the $500 million Sanofi upfront payment and outlook for APA and commercial sales. Of note, we received the full upfront payment of $500 million and approximately $70 million equity investment from Sanofi during the second quarter of 2024.
For the full year 2024 and on a GAAP basis, we expect to achieve total revenue of between $700 million and $800 million. This includes $400 million of revenue recognition from the $500 million Sanofi agreement upfront payment and $25 million in royalty and other revenue from partner-related activities, which is recorded as licensing, royalty and other revenue.
We are updating our full year 2024 product sales guidance and expect to achieve between $275 million and $375 million. This includes $100 million for APAs already delivered through midyear and commercial product market sales of $175 million to $275 million in the second half of 2024.
Importantly, our expectations for the U.S. market performance remain unchanged, and we expect the majority of remaining product sales to occur in the fourth quarter of 2024. $150 million reduction to the midpoint of our full year 2024 product sales guidance reflects $100 million from the New Zealand APA.
We are in ongoing discussions with New Zealand in response to their desire to cancel this agreement. And $50 million from EU commercial sales as we target a smaller set of prioritized countries for the 2024/2025 vaccination season.
For the remaining APA agreements, our intent is to amicably negotiate or deliver doses or when appropriate, exit agreements, with the goal of these activities to be cash flow neutral or favorable on a go-forward basis. To be conservative, we're removing APA sales from our forward-looking revenue expectations until further clarity is available on each. We'll instead emphasize realization of cost savings that come from exiting commercial markets.
Our current operating plan, including the multiyear combined R&D and SG&A expense targets, highlights a path to maintaining our goal of at least 1 to 2 years of cash on hand prior to receipt of cash flows from the Sanofi agreement in the form of milestones and royalties. We look forward to sharing additional updates as we seek to improve Novavax's financial performance, cost structure and strength to deliver shareholder value. With that, I'd like to turn the call back over to John for some closing remarks.