15. DERIVATIVE LIABILITY

On July 28, 2020, the Company, with its subsidiary, Corbus Pharmaceuticals, Inc., as borrower, entered into the Loan and Security Agreement with K2HV and received $20,000,000 upon signing. The Company has determined that a prepayment feature and default feature needed to be separately valued and marked to market each reporting period after assessing the agreement under ASC 815.

The value of these features is determined each reporting period by taking the present value of net cash flows with and without the prepayment features. The significant assumption used to determine the fair value of the debt without any features is the discount rate which has been estimated by using published market rates of triple CCC-rated public companies. All other inputs are taken from the Loan and Security Agreement. The additional significant assumptions used when valuing the prepayment feature is the probability of a change of control event. The Company has determined the probability from December 31, 2022 to September 30, 2023 has stayed consistent. The additional significant assumption used when valuing the default feature is the probability of defaulting on the repayment of loan. The Company has determined the probability from December 31, 2022 to September 30, 2023 has remained consistent. The value of these features was determined to be approximately $36,868 at December 31, 2022 and September 30, 2023, which resulted in no expense recognized in the nine months ended September 30, 2023. The Company considers the fair value of the derivative liability to be Level 3 under the three-tier fair value hierarchy.