nm—not meaningful
Research and development. Our research and development expense increased by $2.4 million, or 26%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023. This increase was primarily due to the net effect of (i) a $3.2 million increase in clinical manufacturing costs in preparation for the Phase 3 clinical development program for denifanstat in MASH, (ii) a $1.7 million decrease in clinical trial costs due to the completion of patient dosing in our FASCINATE-2 Phase 2b trial in 2023 with a partial offset from the Phase 3 clinical development program start-up cost and (iii) a $0.6 million increase in other research and development expenses, largely related to non-clinical activities.
General and administrative. Our general and administrative expenses increased by $3.1 million, or 67%, for the six months ended June 30, 2024, compared to the six months ended June 30, 2023 primarily due to (i) a $1.5 million increase in professional fees, largely due to public company compliance, (ii) a $0.5 million increase in insurance expenses due to our becoming a public entity during 2023, (iii) a $0.6 million increase in personnel related expenses, largely related to newly hired executives and other employees, and (iv) a $0.2 million increase in stock-based compensation expense, due primarily to grants made to executives and members of our board of directors during the second quarter of 2024.
Interest income and other. Interest income and other increased by $4.2 million for the six months ended June 30, 2024, compared to the six months ended June 30, 2023, primarily due to an increase of interest income earned on the cash proceeds received from the IPO and the January 2024 follow-on offering.
Liquidity and capital resources
As of June 30, 2024, we have relied on private equity and debt financings and our public offerings to fund our operations. We have incurred net losses and negative cash flows from operations since inception, including net losses of $14.7 million and $13.4 million for the six months ended June 30, 2024 and 2023, respectively. As of June 30, 2024, we had cash, cash equivalents and marketable securities of $188.5 million. We will require substantial additional capital to fund our research and development and ongoing operating expenses in the short and long term.
Based on our current business plans, we believe that our existing cash, cash equivalents, and marketable securities will be sufficient for us to fund our operating expenses and capital expenditure requirements for at least the next 12 months from the date of this Quarterly Report. In the future, we may need to raise additional funds until we are able to generate sufficient revenues to fund our development activities. Our future operating activities, coupled with our plans to raise capital or issue debt financing, may provide additional liquidity in the future, however these actions are not solely within our control and we are unable to predict the outcome of these actions to generate the liquidity ultimately required.
Our primary uses of cash are to fund our operations, which consist primarily of research and development expenditures related to our programs and, to a lesser extent, general and administrative expenditures. We anticipate that we will continue to incur significant expenses for the foreseeable future as we continue to advance our drug candidates, expand our corporate infrastructure, including the costs associated with being a public company, further our research and development initiatives for our drug candidates, scale our laboratory and manufacturing operations, and incur marketing costs associated with potential commercialization. We are subject to all of the risks typically related to the development of new drug candidates, and we may encounter unforeseen expenses, difficulties, complications, delays and other unknown factors that may adversely affect our business. We anticipate that we will need substantial additional funding in connection with our continuing operations.
Until we can generate a sufficient amount of revenue from the commercialization of our drug candidates or additional revenue from collaboration agreements with third parties, if ever, we expect to finance our future cash needs through public or private equity or debt financings, third-party (including government) funding and marketing and distribution arrangements, as well as other collaborations, strategic alliances and licensing arrangements, or any combination of these approaches. The sale of equity or convertible debt securities may result in dilution to our stockholders and, in the case of preferred equity securities or convertible debt, those securities could provide for rights, preferences or privileges senior to those of our common stock. Debt financings may subject us to covenant limitations or restrictions on our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. Our ability to raise additional funds may be adversely impacted by macroeconomic conditions, disruptions to and volatility in the credit and financial markets and geopolitical turmoil. There can be no assurance that we will be successful in acquiring additional funding at levels sufficient to fund our operations or on terms favorable or acceptable to us. If we are unable to obtain adequate financing when