As of December 31, 2023, we had current assets of approximately $25.7 million, including cash, cash equivalents and restricted cash on hand of approximately $15.6 million and current liabilities of approximately $14.5 million. For year ended December 31, 2023, our cash burn, which we define as the total of cash used in operating and investing activities from our statement of cash flows, was approximately $22.6 million, which included approximately $0.5 million of capital spending and improvements related to our new manufacturing facility and corporate headquarters. Our current and historical cash burn is not necessarily indicative of our future use of cash and cash equivalents.
The Company will require additional financing in the future to support the commercialization of its products and proposed products, to initiate and complete new additional clinical studies, and for general working capital purposes. If the Company were to obtain such additional financing through equity financing, the current ownership interest of its stockholders would be diluted and there can be no assurance that the Company will be successful in its capital raising efforts. Should the financing the Company requires be unavailable to the Company, or on terms unacceptable to the Company when the Company requires it, the consequences could have a material adverse effect on the Company's business, operating results, financial condition and prospects. The amount of long-term capital needed is expected to depend on many factors, including:
- rate of sales growth and adoption of the Company's products in the marketplace;- product gross margin;- continued progress and cost of the Company's research and development programs;- progress with and cost of the Company's pre-clinical studies and clinical studies;- the time and costs involved in obtaining regulatory clearance in other countries and/or for other indications;- costs involved in preparing, filing, prosecuting, maintaining, defending and enforcing patent claims;- costs of developing sales, marketing and distribution channels;- market acceptance and reimbursement of the Company's products; and cost for training physicians and other health care personnel.
We have an effective shelf registration statement dated July 14, 2021 with the SEC which enables us to raise up to $150 million in one or more offerings, through the issuance and sale of any combination of equity securities, debt securities, warrants and units. Approximately $135.0 million of this amount was available as of December 31, 2023. We have also allocated $25 million of our total shelf amount to our ATM facility. As of December 31, 2023, approximately $20.3 million was available for use under the ATM facility.
On December 13, 2023, the Company closed on a registered direct offering for the sale, directly to investors, of 7,733,090 registered shares of common stock and warrants to purchase up to 2,706,561 shares of common stock (the "Offering"). Each share of common stock and accompanying warrant to purchase up to 0.35 shares of common stock, were sold together for a combined purchase price of $1.33, for an aggregate purchase price of approximately $10,285,000. After deducting transaction fees and expenses payable by the Company in connection with the Offering, the Company received net proceeds of approximately $9,785,000, excluding any proceeds that may be received upon the exercise of the warrants. Each warrant is immediately cash exercisable at an exercise price of $2.00 per share and will expire on the fifth anniversary of the issue date. The Company's executive officers, directors, and certain non-executive officer employees of the Company also participated in the Offering with a combined investment of $435,000.
On December 30, 2021, we entered into an Open Market Sale Agreement with Jefferies LLC (the "Sale Agreement"). Pursuant to the Sale Agreement we may offer to sell, from time to time, shares of our common stock, up to a maximum of $25,000,000. During the year ended December 31, 2023, the Company sold 2,656,464 shares pursuant to the Sale Agreement, at an average selling price of $1.76 per share, generating net proceeds of approximately $4,532,000. There were no sales pursuant to the Sale Agreement during the year ended December 31, 2022.
On January 19, 2022 (the "Fourth Amendment Closing Date"), the Company closed on the Fourth Amendment (the "Fourth Amendment") of its Amended Loan and Security Agreement with Bridge Bank. Under the terms of the Amendment, the Company received a commitment from Bridge Bank to provide a new term loan of up to $15 million, if needed until December 31, 2022. On December 27, 2022, the Company drew down the first $5 million tranche of the Term C loans available under the terms of the Fourth Amendment.
On December 28, 2022 (the "Fifth Amendment Date"), the Company entered into the Fifth Amendment of its Amended Loan and Security Agreement with Bridge Bank. The Fifth Amendment extends the draw period under the Fourth Amendment to the earlier of (i) March 1, 2023 and (ii) the occurrence of an Event of Default. On March 9, 2023, the Company entered into the Sixth Amendment of its Amended Loan and Security Agreement. The Sixth Amendment further extended the draw period to March 24, 2023. Therefore, no further draws are available as of the date of this filing.
The Company is currently evaluating various financing alternatives, including debt financing, strategic partnerships and other non-equity financing arrangements, including royalty financing. While there can be no assurance that the Company will be successful in obtaining alternative non-equity financing, if such financing is obtained through arrangements with collaborative partners or other non-dilutive sources, such as royalty financing, the Company may have to relinquish economic and/or proprietary rights to some of its technologies or products under development that it would otherwise seek to develop or commercialize itself. Such events may have a material adverse effect on the Company's business, operating results, financial condition and prospects.