Developing biotechnology and biopharmaceutical products, including conducting preclinical studies and clinical trials, is a very time-consuming, expensive, and uncertain process that takes years to complete. Our operations have consumed substantial amounts of cash since inception. We expect our expenses to increase in connection with our ongoing activities, particularly as we conduct our planned clinical trials of GRI-0621, GRI-0803 and any other product candidates that we may develop or seek regulatory approvals for and, if approved, launch and commercialize. In particular, we do not expect to be able to continue our clinical trials or development efforts without raising additional funds. We also expect to incur additional costs associated with operating as a public company. Accordingly, we will need to obtain substantial additional funding in order to maintain our continuing operations. If we are unable to raise capital when needed or on acceptable terms, we may be forced to delay, reduce, or eliminate one or more of our research and drug development programs or future commercialization efforts.
As of December 31, 2023, we had approximately $1.8 million in cash and cash equivalents and an accumulated deficit of approximately $31.5 million. If we secure additional funds, we expect to devote substantial financial resources to our planned activities, particularly as we conduct our clinical trials of GRI-0621 and GRI-0803, advance our discovery programs and continue our product development efforts. We are also party to a registration rights agreement that requires us to, among other things, obtain effectiveness of a registration statement and to maintain the effectiveness of the registration statements for resale of the shares underlying the Exchange Warrants (as defined below) and the Equity Warrants (as defined below). If we fail to comply with these obligations, we would be subject to substantial cash penalties and, as of the date of this Annual Report, would likely not have the resources to make such payments and continue our operations.
On October 13, 2023, we filed a registration statement on Form S-3 for the offer and resale of the shares underlying the Exchange Warrants and the Equity Warrants, as amended by a Pre-Effective Amendment No. 1 to Form S-3 on Form S-1, filed on December 4, 2023, which was declared effective on December 15, 2023.. On February 1, 2024, we entered into a securities purchase agreement (the Purchase Agreement) with each purchaser identified on the signature pages thereto, pursuant to which we agreed to issue and sell, in a public offering, (i) 330,450 shares (the Shares) of Common Stock, (ii) 4,669,550 pre-funded warrants (the Pre-Funded Warrants) exercisable for an aggregate of 4,669,550 shares of Common Stock, (iii) 5,000,000 Series B-1 common warrants (the Series B-1 Common Warrants) exercisable for an aggregate of 5,000,000 shares of Common Stock, and (iv) 5,000,000 Series B-2 common warrants (the Series B-2 Common Warrants, and together with the Series B-1 Common Warrants, the Common Warrants) exercisable for an aggregate of 5,000,000 shares of Common Stock. The Common Warrants together with the Pre-Funded Warrants are referred to in this Annual Report as the "Warrants." The securities were offered in combinations of (a) one Share or one Pre-Funded Warrant, together with (b) one Series B-1 Common Warrant and one Series B-2 Common Warrant, for a combined purchase price of $1.10 (less $0.0001 for each Pre-Funded Warrant).
In addition, we expect to continue to incur additional costs associated with operating as a public company. Based on our current operating plan, we believe that our existing cash and cash equivalents will be sufficient to fund our operating expenses and capital expenditure requirements only into the second half of 2024. The Series T Warrants issued pursuant to that certain Securities Purchase Agreement, dated December 13, 2022, by and among the Company, GRI Operations and Altium Growth Fund L.P. (Altium), currently can be force exercised. We have based these estimates on assumptions that may prove to be wrong, and we could exhaust our available capital resources sooner than we expect. Our future capital requirements and the period for which our existing resources will support our operations may vary significantly from what we expect, and we will require additional funding to recommence development of our product candidates. Our spending levels will vary based on new and ongoing development and corporate activities. Because the length of time and activities associated with development of our product candidates is highly uncertain, we are unable to estimate the actual funds we will require for development, and assuming approval, marketing and commercialization activities.
We will need to raise substantial funds in the near term in addition to the funds raised in the offering completed in February 2024 in order to regain compliance with Nasdaq's currently applicable stockholders' equity requirement and continue operations, as discussed further below. We intend to raise additional funds in the near term. However, additional funding may not be available on acceptable terms, if at all. Until we can generate sufficient revenue to finance our cash requirements, which we may never do, we expect to finance our future cash needs through a combination of public or private equity offerings, debt financings, collaborations, strategic alliances, licensing arrangements and other marketing or distribution arrangements. If we raise additional funds through public or private equity offerings, the terms of these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Further, to the extent that we raise additional capital through the sale of Common Stock or securities convertible or exchangeable into Common Stock, our stockholders' ownership interest will be diluted. In addition, any debt financing may subject us to fixed payment obligations and covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures, or declaring dividends. If we raise additional capital through marketing and distribution arrangements or collaborations, strategic alliances, or licensing arrangements with third parties, we may have to relinquish certain valuable intellectual property or other rights to our product candidates, technologies, future revenue streams or research programs or grant licenses on terms that may not be favorable to us. We also may be required to seek collaborators for any of our product candidates at an earlier stage than otherwise would be desirable or relinquish our rights to product candidates or technologies that we otherwise would seek to develop or commercialize ourselves. Market volatility resulting from inflation, pandemics, geopolitical events or other financial markets factors could also adversely impact our ability to access capital as and when needed. If we are unable to secure adequate additional funding, we will need to reevaluate our operating plans and may be forced to make reductions in spending, extend payment terms with suppliers, liquidate assets where possible, delay, scale back or eliminate some or all of our development programs, relinquish rights to our technology on less favorable terms than we would otherwise choose or cease operations entirely. These actions could materially impact our business, results of operations, our future prospects and the value of shares of our Common Stock, and as a result, our stockholders may receive no value for their investment. In addition, attempting to secure additional financing diverts the time and attention of management from day-to-day activities and distract from our discovery and product development efforts.