We do not allocate personnel-related costs, including stock-based compensation costs, or other indirect costs to specific programs, as they are deployed across multiple projects under development and discovery and, as such, are separately classified as internal research and development expenses in the table above. The majority of other program expenses in the table above represent clinical programs that we seek to partner.
Research and development expenses for the three months ended September 30, 2024 decreased by $2.2 million compared to the three months ended September 30, 2023, due to lower costs on other programs and preclinical development and lower internal costs, primarily lower personnel-related costs and depreciation.
Research and development expenses for the nine months ended September 30, 2024 decreased by $3.5 million compared to the nine months ended September 30, 2023, as net costs for the LNCB74 program were offset by lower costs on other programs and preclinical development and lower internal costs, primarily lower personnel-related costs and depreciation.
General and Administrative Expenses
General and administrative expenses for the three months ended September 30, 2024 decreased by $0.9 million compared to the three months ended September 30, 2023. The decrease was primarily due to lower payroll, lower stock compensation expense, and lower insurance costs.
General and administrative expenses for the nine months ended September 30, 2024 decreased by $3.6 million compared to the nine months ended September 30, 2023. The decrease was primarily due to lower payroll, lower stock compensation expense, and lower insurance costs.
Restructuring and Asset Impairment Charges
Restructuring and asset impairment charges were $2.5 million for the nine months ended September 30, 2024, consisting of $0.7 million of severance charges as a result of a reduction in force announced on March 21, 2024, and $1.8 million of asset impairment charges associated with the write-down of certain manufacturing equipment, right of use assets and related improvements as a result of the pause in manufacturing that we announced on March 21, 2024. There were no restructuring and asset impairment charges for the three and nine months ended September 30, 2023.
Other Income, Net
Other income, net for the three months ended September 30, 2024 decreased by $0.4 million compared to the three months ended September 30, 2023, due to lower interest income as a result of lower cash available to invest.
Other income, net for the nine months ended September 30, 2024 decreased by $0.3 million compared to the nine months ended September 30, 2023, as lower interest income as a result of lower cash available to invest was partially offset by higher accretion of investment discounts on marketable securities.
Liquidity and Capital Resources
We have financed our operations primarily with proceeds from public offerings of our common stock, private placements of our preferred stock and upfront fees received under the Company’s former agreement with Eli Lilly and Company, which was terminated in March 2020 (the “Lilly Agreement”). On May 13, 2019, we closed our IPO, in which we sold 5,750,000 shares of common stock at a public offering price of $15.00 per share, for net offering proceeds to us of approximately $77.0 million after deducting underwriting discounts and commissions and offering expenses. On November 19, 2019, we completed an underwritten public offering in which we sold 4,077,192 shares of common stock at a public offering price of $36.75 per share. On December 2, 2019, the underwriters exercised in full their option to purchase an additional 611,578 shares of common stock at a public offering price of $36.75. Net offering proceeds to us were approximately $160.9 million after deducting underwriting discounts and commissions and offering expenses. Since inception, we have received aggregate gross proceeds of $164.4 million from the sale and issuance of shares of our