(6) Debt

Long‑term debt consisted of the following at December 31, 2020 and 2019 (in thousands):


	December 31,
	2020		2019
OrbiMed Term Loan (related party)	$	30,000	$	30,000
End of term charge		3,000		3,000
Unamortized end of term charge and issuance costs		(2,173)		(2,757)
Long-term debt with related party	$	30,827	$	30,243

OrbiMed Term Loan (Related Party)

In November 2018, the Company entered into a senior secured term loan facility (“OrbiMed Credit Facility”) with OrbiMed Royalty Opportunities II, LP (“OrbiMed”), a related party as the lender is affiliated with a stockholder of the Company, which consists of up to $35.0 million in term loans (“OrbiMed Term Loans”). The OrbiMed Term Loans consist of two tranches, a $30.0 million Tranche 1 (“Tranche 1”) and a $5.0 million Tranche 2 (“Tranche 2”). In November 2018, the Company borrowed $30.0 million of Tranche 1 and used a portion of the proceeds to repay the MidCap Credit Facility (described below). The Company elected not to borrow Tranche 2 prior to its expiration on December 31, 2019.

Pursuant to the OrbiMed Credit Facility, the Company provided a first priority security interest in all existing and future acquired assets, excluding intellectual property and certain other assets, owned by the Company. The OrbiMed Credit Facility contains a negative pledge on intellectual property owned by the Company. The OrbiMed Credit Facility also contains customary indemnification obligations and customary events of default, including, among other things, (i) nonpayment, (ii) breach of warranty, (iii) nonperformance of covenants and obligations, (iv) default on other indebtedness, (v) judgments, (iv) change of control, (vii) bankruptcy and insolvency, (viii) impairment of security, (ix) key permit events, (x) key person event, (xi) regulatory matters, (xii) and key contracts. In addition, the Company must maintain a minimum cash balance of $2.0 million. If an event of default occurs under the OrbiMed Credit Facility, the Company may become obligated to immediately pay all outstanding principal and interest and all other due and unpaid obligations at the current rate in effect plus 3%.

The OrbiMed Term Loan matures on November 16, 2023 and bear interest at a rate equal to 7.75% plus the greater of one‑month LIBOR or 2.0%. At December 31, 2020, the interest rate was 9.75%. The Company is required to make 60 monthly interest payments beginning on November 30, 2018, with the entire principal payment due at maturity. The OrbiMed Term Loans have a prepayment penalty equal to 10.0% of the prepaid principal amount prior to the second anniversary of the Term Loans, 5.0% of the prepaid principal amount after the second anniversary but prior to the third anniversary and 2.5% of the prepaid principal amount after the third anniversary. The Company is also required to pay an exit fee at the time of maturity or prepayment event equal to 10.0% of all principal borrowings (the “End of Term Charge”) and an administration fee equal to $10,000 on the last day of each quarter until all obligations have been paid in full. In conjunction with the closing of the OrbiMed Term Loans, the Company incurred $0.3 million of third party and lender fees, which along with the End of Term Charge of $3.0 million were recorded as debt issuance costs, and are being recognized as interest expense over the term of the loan using the effective‑interest method. Interest expense associated with the OrbiMed Credit Facility recorded during 2020, 2019 and 2018 was $3.6 million, $3.6 million and $0.6 million, respectively.

MidCap Credit Facility

In April 2018, the Company entered into a $14.0 million debt financing transaction (“MidCap Credit Facility”) with MidCap Financial (“MidCap”), which consisted of a $3.5 million revolving credit facility (“Revolver”) and $10.5 million in term loans (“MidCap Term Loans”). The Term Loans consisted of two tranches, an $8.0 million Tranche 1 (“MidCap Tranche 1”) and a $2.5 million Tranche 2 (“MidCap Tranche 2”). In April 2018, the Company borrowed $8.0 million of MidCap Tranche 1 and used the majority of the proceeds to repay the note payable outstanding.

The MidCap Term Loans and the Revolver bore interest at a rate equal to one‑month LIBOR plus 7.0% and one‑month LIBOR plus 3.75%, respectively, until the aggregate principal, interest, and End of Term Charge totaling $0.4 million were paid with part of the proceeds received from the OrbiMed Credit Facility. As a result of these payments, a $1.2 million loss on extinguishment was recorded during the year ended December 31, 2018. Interest expense associated with the Midcap Credit Facility recorded during 2018 was $0.6 million.

Note Payable

In March 2017, the Company entered into a Loan and Security Agreement (“Loan Agreement”) and borrowed $5.0 million (“Note A”). Note A bore interest at 9.45% until the aggregate principal, interest, and other termination fees were paid with part of the proceeds received from the MidCap Credit Facility. As a result of these payments, a $0.6 million loss on extinguishment was recorded during the year ended December 31, 2018. Interest expense associated with Note A recorded during the year ended December 31, 2018 was $0.4 million.