Research and development expenses for the three months ended June 30, 2024 decreased by $1.0 million compared to the three months ended June 30, 2023, as costs for the LNCB74 program were offset by lower costs on other programs and preclinical development and lower internal costs, primarily due to lower personnel-related costs and depreciation.
Research and development expenses for the six months ended June 30, 2024 decreased by $1.3 million compared to the six months ended June 30, 2023, as higher costs associated with adding patients in our Phase 1b clinical trial of NC410 in patients with ovarian cancer and colorectal cancer and net costs for the LNCB74 program were offset by lower costs on other programs and preclinical development and lower internal costs, primarily due to lower personnel-related costs.
General and Administrative Expenses
General and administrative expenses for the three months ended June 30, 2024 decreased by $1.6 million compared to the three months ended June 30, 2023. The decrease was primarily due to lower payroll, lower stock compensation expense, lower professional fees and lower insurance costs.
General and administrative expenses for the six months ended June 30, 2024 decreased by $2.7 million compared to the six months ended June 30, 2023. The decrease was primarily due to the same factors stated above.
Restructuring and Asset Impairment Charges
Restructuring and asset impairment charges were $2.5 million for the six months ended June 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 six months ended June 30, 2023.
Other Income, Net
Other income, net for the three months ended June 30, 2024 decreased by $0.2 million compared to the three months ended June 30, 2023, due to lower interest income as a result of lower cash available to invest.
Other income, net was $2.3 million for both the six months ended June 30, 2024 and 2023, as lower amortization of premiums on our investments offset lower cash available to invest.
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 preferred stock. In addition, in November 2018, we received an upfront payment of $25.0 million in cash from Lilly pursuant to the Lilly Agreement. Our cash and cash equivalents are held in money market funds.
On August 4, 2023, we entered into a sales agreement (the “Sales Agreement”) with Leerink Partners LLC (the “Agent”), pursuant to which we may sell, from time to time, up to an aggregate sales price of $75 million of our common stock through the Agent in negotiated transactions that are deemed to be an “at the market offering.” The Agent will be