Liquidity and Capital Resources
We have not generated any revenue from product sales. Since inception, we have incurred net losses and negative cash flows from our operations. Through December 31, 2021, we have funded substantially all of our operations with $405.8 million in net proceeds from the sale and issuance of our equity securities, debt securities and borrowings under debt facilities. We have also received an aggregate of $29.0 million pursuant to emerging markets collaboration and licensing agreements for our inactive biosimilar development programs.
We anticipate incurring additional losses until such time, if ever, that we can generate significant sales of ONS-5010 or any other product candidate we may develop. We will need substantial additional financing to fund our operations and to commercially develop ONS-5010 or any other product candidate we may develop. Management is currently evaluating various strategic opportunities to obtain the required funding for future operations. These strategies may include but are not limited to payments from potential strategic research and development, licensing and/or marketing arrangements with pharmaceutical companies, private placements and/or public offerings of equity and/or debt securities. Alternatively, we will be required to, among other things, make further reductions in our workforce, scale back our plans and place certain activities on hold, discontinue our development programs, liquidate all or a portion of our assets, and/or seek protection under the provisions of the U.S. Bankruptcy Code.
On November 5, 2020, we received $10.0 million in net proceeds from issuance of an unsecured promissory note, or 2020 Note, with face amount of $10.2 million. The note bears interest at a rate of 7.5% per annum, matures January 1, 2022, and includes an original issue discount of $0.2 million. We may prepay all or a portion of the note at any time by paying 105% of the outstanding balance elected for pre-payment. On November 16, 2021, entered into a note amendment (the “Note Amendment”) which, among other things, (i) extended the maturity date to January 1, 2023, (ii) increased the interest rate from 7.5% per annum to 10% per annum beginning on January 1, 2022 and (iii) provided for the lender’s right to redeem some or all of the outstanding balance of the Note for shares of our common stock beginning July 1, 2022, subject to certain limitations.
In October 2021 and November 2021, we sold an additional 1,773,974 shares of common stock under and generated $3.5 million in net proceeds from the ATM Offering after payment of fees to the sales agent of $0.1 million.
On November 16, 2021, we received $10.0 million in net proceeds from issuance of an unsecured promissory note, or 2021 Note, with face amount of $10.2 million. The note bears interest at a rate of 9.5% per annum, matures January 1, 2023, and includes an original issue discount of $0.2 million. We may prepay all or a portion of the note at any time by paying 105% of the outstanding balance elected for pre-payment.
In November 2021, we issued in an underwritten public offering an aggregate of 46,000,000 shares of common stock at a purchase price per share of $1.25 for $54.0 million in net proceeds after payment of underwriter discounts and commissions and other underwriter offering costs. GMS Ventures purchased an aggregate of 16,000,000 shares of common stock in the public offering at the public offering price per share. In connection with the underwritten public offering, we issued the underwriter warrants to purchase up to an aggregate of 2,100,000 shares of common stock at an exercise price of $1.5625 per share, which warrants have a 5-year term.
We evaluated whether there are conditions or events, considered in the aggregate, that raise substantial doubt about our ability to continue as a going concern. As of December 31, 2021, we had an accumulated deficit of $357.3 million. In addition, $22.1 million of unsecured promissory notes, which bear interest compounding daily, and mature January 1, 2023 and a $0.5 million loan granted pursuant to the PPP of the CARES Act, which matures on May 2, 2022, are outstanding as of December 31, 2021. Our current cash resources of $70.2 million as of December 31, 2021 are expected to fund our operations through the anticipated approval of the ONS-5010 BLA expected in the first calendar quarter of 2023.
Our future operations are highly dependent on a combination of factors, including (i) the timely and successful completion of additional financing discussed above, (ii) our ability to complete revenue-generating partnerships with pharmaceutical companies, (iii) the success of our research and development, (iv) the development of competitive therapies by other biotechnology and pharmaceutical companies, and, ultimately, (v) regulatory approval and market acceptance of our proposed future products.