expiration of the lease in November 2027. The lease provides for a six-month rent abatement period that began upon commencement of the lease term which occurred in October 2022.
Financing Activities
In July 2022, we entered into amended securities purchase agreements with Handok, Inc. (“Handok”) and certain of its affiliates (the “2022 Private Placement”), resulting in gross proceeds of $12.3 million in exchange for the issuance of approximately 3.2 million shares of common stock. We incurred approximately $0.8 million for underwriting commissions and other offering costs, resulting in net proceeds of $11.5 million.
Termination of Loan Agreement
On April 14, 2021, we entered into a $30.0 million Loan and Security Agreement (the “Loan Agreement”) with Solar Investment Corp. (“SLR”) as collateral agent, and the parties executing the Loan Agreement as lenders, including SLR in its capacity as a lender. The scheduled maturity date of the Loan Agreement was on April 1, 2026. In April 2021, we borrowed $15.0 million under the Loan Agreement. On June 30, 2022, we paid off the outstanding loan amount of $15.0 million in full and terminated the Loan Agreement in accordance with its terms.
Please refer to our discussion under the caption Liquidity and Capital Resources for further discussion of our recent financing activities.
Factors Impacting our Results of Operations
We have not generated any meaningful revenues since our inception in March 2010. Over the last several years, we have conducted private placements and public offerings to raise additional capital, adopted a licensing model to pursue development of product candidates, conducted pre-clinical and clinical trials, and conducted other research and development activities on our pipeline of product candidates.
Due to the time required to conduct clinical trials and obtain regulatory approval for our product candidates, we anticipate it will be several years before we generate substantial revenues, if ever. We expect to incur operating losses for the foreseeable future; therefore, we expect to continue efforts to raise additional capital to maintain our current operating plans over the next several years. We cannot assure you that we will secure such financing or that it will be adequate for the long-term execution of our business strategy. Even if we obtain additional financing, it may be costly and may require us to agree to covenants or other provisions that will favor new investors over our existing shareholders.
Key Components of Consolidated Statements of Operations and Comprehensive Loss
Research and development expenses. Research and development (“R&D”) expenses consist primarily of compensation and benefits for our personnel engaged in R&D activities, clinical trial costs, licensing costs, and consulting and outside services. Our R&D compensation costs include an allocable portion of our cash and share-based compensation, employee benefits, and consulting costs related to personnel engaged in the design and development of product candidates and other scientific research projects. We also allocate a portion of our facilities and overhead costs based on the personnel and other resources devoted to R&D activities.
General and administrative expenses. General and administrative (“G&A”) expenses consist primarily of (i) an allocable portion of our cash and share-based compensation and employee benefits related to personnel engaged in our administrative, finance, accounting, and executive functions, and (ii) an allocable portion of our facilities and overhead costs related to such personnel. G&A expenses also include travel, legal, auditing, consulting, investor relations and other costs primarily related to our status as a public company.
Interest and other income. Interest and other income consist primarily of interest income earned on investments and temporary cash investments.
Loss from change in fair value of derivative liabilities. We recognize liabilities for financial instruments that are required to be accounted for as derivatives, as well as embedded derivatives in our debt agreements. Derivative liabilities are adjusted to fair value at the end of each reporting period until the contracts are settled, expire, or otherwise meet the conditions for equity classification. Changes in fair value are reflected as a gain or loss in our unaudited condensed consolidated statements of operations and of comprehensive loss.