General and administrative expenses for the three months ended September 30, 2023 decreased by $1.1 million compared to the three months ended September 30, 2022. The increase was primarily due to lower payroll, lower stock compensation expense, lower insurance costs and lower legal costs.
General and administrative expenses for the nine months ended September 30, 2023 decreased by $1.0 million compared to the nine months ended September 30, 2022. The decrease was primarily due to lower stock compensation costs, lower insurance costs and lower professional fees partially offset by higher legal costs.
Other Income, Net
Other income, net for the three months ended September 30, 2023 increased by $1.0 million compared to the three months ended September 30, 2022, due to higher interest income as a result of higher interest rates and lower amortization on our investments.
Other income, net for the nine months ended September 30, 2023 increased by $2.9 million compared to the nine months ended September 30, 2022, due to higher interest income as a result of higher interest rates and lower amortization on our investments.
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, the Company entered into a sales agreement (the “Sales Agreement”) with Leerink Partners LLC (the “Agent”), pursuant to which the Company may sell, from time to time, up to an aggregate sales price of $75 million of its common stock through the Agent in negotiated transactions that are deemed to be an “at the market offering.” The Agent will be entitled to compensation equal to 3.0% of the gross proceeds from the sale of all shares of common stock sold through it as Agent under the Sales Agreement. Actual sales will depend on a variety of factors to be determined by the Company from time to time, including, among other things, market conditions, the trading price of the common stock, capital needs and determinations by the Company of the appropriate sources of funding for the Company. We have not yet sold any shares of our common stock pursuant to the Sales Agreement.
As of September 30, 2023, we had cash, cash equivalents and marketable securities of $118.2 million. We believe that our existing cash, cash equivalents and marketable securities will be sufficient to fund our planned operations into mid-2025.
We will continue to require additional capital to develop our product candidates and fund operations for the foreseeable future. We may seek to raise capital through sale of equity, debt financings, strategic alliances and licensing arrangements. Adequate additional funding may not be available to us on acceptable terms or at all. If we fail to raise capital or enter into such arrangements as and when needed, we may have to significantly delay, scale back or discontinue the development of our product candidates or delay our efforts to expand our pipeline of product candidates.