redeemable convertible preferred stock in March 2021 and $0.8 million proceeds from issuance of restricted common stock purchased by an employee and stock option exercises. The proceeds were partially offset by the repayment of the 2020 Term loan of $26.2 million and payment of debt extinguishment fees of $1.9 million in September 2021.
During the nine months ended September 30, 2020, net cash provided by financing activities was $64.2 million, consisting primarily of net proceeds of $49.9 million from the issuance of redeemable convertible preferred stock in April 2020, $9.5 million proceeds from issuance of convertible notes in February 2020, and $25.0 million in proceeds from the issuance of long-term debt in May 2020. Partially offsetting the proceeds from financing activities were $18.0 million for the repayment of term loans, $1.4 million payments to extinguish debt, and $0.9 million in payment of debt issuance costs.
Long-term debt
In May 2020, we entered into the 2020 Term Loan which provides for borrowings of an initial $25.0 million tranche upon closing and options to borrow up to an aggregate of $35.0 million in two additional tranches of $20.0 million under the second tranche, or the Term B Loan, and $15.0 million under the third tranche, or the Term C Loan, subject to certain Growth Direct system sales milestones.
At closing, we issued warrants to purchase 1,195,652 shares of Series C1 Preferred Stock to the lender with an exercise price of $1.15 per share. We paid a $0.8 million facility fee in connection with the 2020 Term Loan.
The 2020 Term Loan’s interest rate could be elected each quarter by us, as either (a) 12%, up to 7% of which may be Payment in Kind, or PIK, interest or (b) 13% PIK interest.
In September 2021, we repaid the 2020 Term Loan and incurred a debt extinguishment loss of $3.1 million, which was comprised of a $1.8 million prepayment penalty, $1.1 million in expense related to unamortized discounts, and $0.2 million in unamortized prepaid facility fee and other charges. For additional information on the 2020 Term Loan, see Note 9 —Long-term Debt to our condensed consolidated financial statements.
Contractual obligations and commitments
In October 2013, we entered into an operating lease for office and manufacturing space in Lowell, Massachusetts, which expires in July 2026. The terms of the lease include options for a one-time, five-year extension of the lease and early termination of the lease in July 2024 as well as a $0.7 million tenant improvement allowance which has been drawn down in full. Future minimum commitments under this lease through July 2026 are $2.3 million and $2.6 million as of September 30, 2021 and December 31, 2020, respectively.
In December 2016, in connection with the amendment of a then-outstanding loan agreement with the lender, we entered into an agreement under which we are obligated to pay the lender an exit fee in the amount of $0.8 million in the event of a “qualifying exit event” prior to December 31, 2026. As defined in the agreement, a “qualifying exit event” includes but is not limited to a liquidation, merger, sale or change of control of the company or a public offering of its common stock. No amounts were accrued at December 31, 2020 as a “qualifying exit event” was not deemed probable. The IPO was a qualifying event and we expensed and paid the exit fee in July 2021.
In March 2020, we entered into an agreement with a supplier to secure future supply of certain materials used in the manufacturing of our Growth Direct systems. As of September 30, 2020, we had committed to minimum payments under these arrangements totaling $0.9 million through December 31, 2022. We had $0.3 million and $0.1 million accrued for the supply agreement as of September 30, 2021 and December 31, 2020, respectively.
In December 2020, we entered into a non-cancelable agreement with a service provider for software as a service and cloud hosting services. As of September 30, 2021, we had committed to minimum payments under these arrangements totaling $1.1 million through January 31, 2026. There were no amounts accrued for this agreement as of September 30, 2021 and December 31, 2020.