headcount, a $1.7 million increase in professional fees primarily related to our ongoing pre-launch preparations in anticipation of the potential approval of our BLA for ONS-5010, and a $1.5 million increase in facilities, fees and other expenses associated with increased business insurance premiums and a gain recorded after the assignment of our Monmouth Junction, New Jersey corporate office lease in 2021.
Interest Expense
Interest expense increased by $0.5 million to $1.1 million for the nine months ended June 30, 2022, as compared to $0.7 million for the nine months ended June 30, 2021. The increase was primarily related to a new unsecured promissory note issued in November 2021.
Loss on extinguishment of debt
We recognized a $1.0 million loss on extinguishment related to an unsecured promissory note amendment during the period that was accounted for as an extinguishment of the old promissory note.
Change in Fair Value of Warrant Liability
During the nine months ended June 30, 2022, we recorded a gain of $0.5 million related to the decrease in the fair value of our common stock warrant liability associated with the warrants issued in connection with the senior secured notes originally issued December 2017, which resulted from a decrease in the price of our common stock.
During the nine months ended June 30, 2021, we recorded a loss of $0.4 million related to an increase in the fair value of our common stock warrant liability associated with the warrants issued in connection with the senior secured notes originally issued December 2017, which resulted from an increase in the price of our common stock.
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 June 30, 2022, we have funded substantially all of our operations with $408.8 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 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 potential licensing and/or marketing arrangements or collaborations with pharmaceutical or other companies, the issuance of equity securities, the issuance of additional debt, and revenues from potential future product sales, if any. Alternatively, we may be required to, among other things, modify our clinical trial plans for ONS-5010 in additional indications, make 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 the issuance of an unsecured promissory note, or 2020 Note, with a face amount of $10.2 million. The note bore interest at a rate of 7.5% per annum, and was due to mature on January 1, 2022, and included an original issue discount of $0.2 million. On November 16, 2021, we entered into a 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. On June 30, 2022, we prepaid the note in full by paying 105% of the outstanding balance. The total payment was $12,934,484, which included interest of $1,546,038.