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Borrowings
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Borrowings BORROWINGS
Solar Capital and Western Alliance Bank Loan Agreement
On May 16, 2018, we entered into a loan and security agreement (the "2018 Loan Agreement"), with Solar Capital Ltd. and Western Alliance Bank (the "Lenders”). The 2018 Loan Agreement provides for a $50.0 million term loan facility with a maturity date of November 1, 2022 (the "2018 Term Loan”). The full amount of the 2018 Term Loan was funded on May 16, 2018. We received net proceeds from the loan of approximately $49.3 million, after deducting the closing fee, legal expenses and issuance costs. On October 9, 2020, we and the Lenders entered into an amendment to the 2018 Loan Agreement (“the 2020 Amendment”) to extend the date through which we were permitted to make interest-only payments on the 2018 Term Loan by twelve months to December 1, 2021 subject to the repayment terms noted below.
Borrowings under the 2018 Term Loan bear interest at a floating per annum rate equal to 7.45% plus the one-month London Inter-bank Offered Rate ("LIBOR"). We were permitted to make interest-only payments on the 2018 Term Loan through June 1, 2020, or until we achieved our primary endpoint in the Phase 3 study of tenapanor for the treatment of hyperphosphatemia in end-stage renal disease patients on dialysis prior to June 1, 2020, in which case we would have been permitted to make interest-only payments on the 2018 Term Loan through December 1, 2020. On December 3, 2019, we reported positive topline results for PHREEDOM, a long-term Phase 3 study evaluating the efficacy and safety of tenapanor as monotherapy for the treatment of hyperphosphatemia in adult patients with CKD on dialysis. The Lenders were in agreement that these positive data from the Phase 3 PHREEDOM study achieve the “Phase 3 Endpoint” required by the 2018 Term Loan to extend the interest only period by six months to December 1, 2020. Subsequent to the 2020 Amendment, the interest only period was extended an additional twelve months to December 1, 2021. Accordingly, beginning on December 1, 2021 through
the maturity date, we would have been required to make monthly payments of interest plus repayment of the 2018 Term Loan in consecutive equal monthly installments of principal. If however, either the FDA did not approve our NDA for tenapanor for control of serum phosphorus in adult patients with CKD on dialysis on or before May 31, 2021 or the FDA issued a Complete Response Letter ("CRL") for tenapanor for the control of serum phosphorus in adult CKD on dialysis, then we would begin principal payments on the earlier of June 1, 2021 or the first day of the month immediately following the date that the FDA issued a CRL to us.
In May and July 2021, we and the Lenders entered into additional amendments to the 2018 Loan Agreement (“the 2021 Amendments”) which together extended the period of time that we were permitted to make interest-only payments on the 2018 Term Loan to December 1, 2021; provided that if we had not received FDA approval for our NDA for tenapanor for the control of serum phosphorus in adult patients with CDK on dialysis on or before October 25, 2021, the interest-only period would expire and principal repayments would be required to begin on November 1, 2021. If principal repayments were required to begin prior to December 1, 2021 under the 2021 Amendments, then the first such repayment was required include all payments that would have been due if monthly principal repayment had begun on June 1, 2021. Accordingly, during November 2021, in compliance with the terms of our 2018 Loan Agreement, we paid the first principal repayment on the 2018 Term Loan in the amount of $16.7 million and have paid all other subsequently due principal payments through December 31, 2021.
We paid a closing fee of $0.5 million, upon the closing of the 2018 Term Loan and $0.1 million upon closing of the 2020 Amendment. Under the 2018 Term Loan, we were obligated to pay a final fee equal to 3.95% of the 2018 Term Loan upon the earliest to occur of the maturity date, the acceleration of the 2018 Term Loan, the prepayment or repayment of the 2018 Term Loan or the termination of the 2018 Loan Agreement. Under the 2020 Amendment, the final fee was increased to 4.95% of the 2018 Term Loan. We may voluntarily prepay the outstanding 2018 Term Loan, subject to a prepayment premium of (i) 3% of the principal amount of the 2018 Term Loan if prepaid prior to or on the first anniversary of the Closing Date, (ii) 2% of the principal amount of the 2018 Term Loan if prepaid after the first anniversary of the Closing Date through and including the second anniversary of the Closing Date, or (iii) 1% of the principal amount of the 2018 Term Loan if prepaid after the second anniversary of the Closing Date and prior to the maturity date. The 2018 Term Loan is secured by substantially all of our assets, except for our intellectual property and certain other customary exclusions. Additionally, in connection with the 2018 Term Loan, we entered into the 2018 Exit Fee Agreement, as discussed in Note 7 - Derivative Liability.
The 2018 Loan Agreement contains customary representations and warranties and customary affirmative and negative covenants, including restrictions on payment of dividends for our common stock. As of December 31, 2021, we were in compliance with all of the covenants set forth in the 2018 Loan Agreement.
In addition, the 2018 Loan Agreement contains customary events of default that entitle the Lender to cause our indebtedness under the 2018 Loan Agreement to become immediately due and payable, and to exercise remedies against us and the collateral securing the 2018 Term Loan, including its cash. Upon the occurrence and for the duration of an event of default, an additional default interest rate equal to 4.0% per annum will apply to all obligations owed under the 2018 Loan Agreement. As of December 31, 2021, to our knowledge, there were no facts or circumstances in existence that would give rise to an event of default.
As discussed in Note 18 - Subsequent Events, on February 23, 2022 (the “Closing Date”), we entered into a loan and security agreement (the “2022 Loan Agreement”) with SLR Investment Corp. as collateral agent (the “Agent”), and the lenders listed in the 2022 Loan Agreement (collectively the “2022 Lenders”). The 2022 Loan Agreement provides for a senior secured term loan facility, with $27.5 million (the “Term A Loan”) funded on the Closing Date and an additional $22.5 million that we may borrow on or prior to July 25, 2023; provided that (i) we have received approval by the FDA for our NDA for tenapanor the control of serum phosphorus in chronic kidney disease patients on dialysis by December 31, 2022, and (ii) we have achieved certain product revenue milestone targets described in the 2022 Loan Agreement (the “Term B Loan”, and collectively, the Term A Loan and the Term B Loan, the “2022 Term Loan”). The Term A Loan funds are being used to repay the Term Loan with the Lenders as discussed in Note 6 - Borrowings and to fund our ongoing operations. We had $25.0 million principal from the 2018 Term Loan outstanding as of the Closing Date. We have continued to classify the 2018 Term Loan balance as a current liability as of December 31, 2021 due to the determination of the existence of substantial doubt about our ability to continue operating as a going concern discussed in Note 2 – Summary of Significant Accounting Policies and our assessment that the material adverse change clause under the 2022 Loan Agreement is not within the Company's control. The lender has not invoked the material adverse change clause as of the date of issuance of these financial statements.
As of December 31, 2021, prior to restructuring our debt as discussed in Note 18 - Subsequent Events, our future payment obligations towards the 2018 Term Loan principal and final fee, excluding interest payments and the 2018 Exit Fee were as follows (in thousands):
2022$33,031 
Total repayment obligations$33,031 
Less: Unamortized discount and debt issuance costs(235)
Less: Unaccreted value of final fee(532)
Loan payable32,264 
Less: Loan payable, current portion(32,264)
Loan payable, net of current portion$— 
Subsequent to restructuring the 2018 Term Loan, we will have no debt repayment obligations in 2022 or 2023. We will be required to repay $6.9 million, $9.2 million, $9.2 million, and $2.3 million in Term A Loan principal repayments per year during 2024, 2025, 2026 and 2027, respectively, as well as a final fee in the amount of $1.4 million in 2027.