The Company’s Amended Credit Facility with MidCap provides for a revolving credit commitment up to $22.5 million and provided for a term loan commitment up to $5 million. As of December 31, 2019, $12.8 million was outstanding under the revolving line of credit. The principal balance outstanding under the revolving line of credit is due in December 2022.

Amounts outstanding under the revolving line of credit accrues interest at the London Interbank Offered Rate ("LIBOR") plus 6.0%, reset monthly. At December 31, 2019, the revolving line of credit carried an interest rate of 7.69%, with interest payable monthly. The borrowing base is determined based on the value of domestic eligible accounts receivable. As collateral for the Amended Credit Facility, MidCap has a first lien security interest in accounts receivable and a second lien security interest on substantially all other assets.

At December 31, 2019, $0.9 million remains as unamortized debt discount related to the Amended Credit Facility on the consolidated balance sheet, which will be amortized over the remaining term of the Amended Credit Facility.

The Amended Credit Facility also includes several event of default provisions, such as payment default, insolvency conditions and a material adverse effect clause, which could cause interest to be charged at a rate which is up to five percentage points above the rate effective immediately before the event of default or result in MidCap’s right to declare all outstanding obligations immediately due and payable.

On March 8, 2018, the Company entered into a Seventh Amendment to the Amended Credit Facility to extend the date that the financial covenants of the Amended Credit Facility are effective from April 2018 to April 2019, and established a minimum liquidity covenant of $5.0 million effective through March 2019. On November 6, 2018, the Company entered into the Eighth Amendment to the Amended Credit Facility to extend the date that the financial covenants of the Amended Credit Facility are effective from April 2019 to April 2020, and extended the minimum liquidity covenant through March 2020. The Company was in compliance with the covenants under the Amended Credit Facility at December 31, 2019.

On September 1, 2016, the Company and Globus entered into the Globus Facility Agreement, pursuant to which Globus loaned the Company $30 million, subject to the terms and conditions set forth in the Globus Facility Agreement. On November 7, 2018, the Company repaid in full all amounts outstanding and due under the Globus Facility Agreement. The Company made a final payment of $29.2 million to Globus, consisting of outstanding principal and accrued interest. All amounts previously recorded as debt issuance costs were recorded as a loss on debt extinguishment on the Company’s consolidated statement of operations for the year ended December 31, 2018.

On November 6, 2018, the Company closed a $35 million Term Loan with Squadron, a provider of debt financing to growing companies in the orthopedic industry. The net proceeds of approximately $34.1 million were used to retire the Company’s existing $29.2 million term debt with Globus. The remainder of the proceeds were used for general corporate purposes.

The debt has a five-year maturity and bears interest at LIBOR plus 8% (10.0% as of December 31, 2019) per annum. The Agreement specifies a minimum interest rate of 10% and a maximum of 13% per year. Interest-only payments are due monthly through May 2021, followed by $10 million in principal payable in 29 equal monthly installments beginning June 2021 and a $25 million lump-sum payment payable at maturity in November 2023. As collateral for the Term Loan, Squadron has a first lien security interest in substantially all assets except for accounts receivable.

The credit agreement also includes several event of default provisions, such as payment default, insolvency conditions and a material adverse effect clause, which could cause interest to be charged at a rate which is up to five percentage points above the rate effective immediately before the event of default or result in Squadron’s right to declare all outstanding obligations immediately due and payable. Furthermore, the credit agreement contains various covenants, including monthly compliance certifications and compliance with government regulations and maintenance of insurance, and prohibitions against certain specified actions, including acquiring any new equipment financings over a specified amount. The credit agreement also contains various negative covenants including a $5 million minimum liquidity requirement through March 31, 2020. The minimum liquidity covenant will be replaced by a fixed charge ratio, pursuant to which operating cash to fixed charges (as defined) must equal at least 1:1 on a rolling 12-month basis, beginning April 2020. The Company was in compliance with the covenants under the credit agreement at December 31, 2019.

In connection with the initial financing, the Company issued warrants to Squadron to purchase 845,000 shares of common stock at an exercise price of $3.15 per share. The warrants have a seven-year term and are immediately exercisable. See Note 9 for further detail on the warrants.

In March 2019, the Company closed on an expanded credit facility with Squadron for up to $30 million in additional secured financing. This additional financing has been made available under the Company’s existing credit facility with Squadron. The Company accounted for the amendment as a debt modification with continued amortization of the existing and inclusion of the new debt issuance costs of $0.3 million amortized into interest expense utilizing the effective interest rate method. The Company took a draw of $10.0 million of the expanded credit facility in June 2019 to be used for general corporate purposes. The additional borrowings under the credit facility will mature concurrent with the current secured financing from Squadron and bear interest at the same rate and subject to the same 10% floor and 13% ceiling. Interest-only payments are due monthly through May 2021, followed by principal payable in 29 equal monthly installments beginning June 2021 and a lump-sum payment payable at maturity in November 2023. In conjunction with the first draw under the expanded credit facility, the Company issued to Squadron warrants to purchase 4,838,710 shares of the Company’s common stock at an exercise price of $2.17 per share. The warrants have a seven-year term and are immediately exercisable. The warrants were valued utilizing the Monte-Carlo simulation model as described further in Note 9 and are recorded within equity in accordance with authoritative accounting guidance and with a proportional amount, calculated by taking the draw amount divided by the total expanded credit facility, recorded as a debt discount. The total debt discount is amortized into interest expense through maturity of the debt utilizing the effective interest rate method. No additional warrants will be issued upon any future draws. The value of the additional warrants issued that are allocated to the remaining balance available for draw on the expanded credit facility were recorded as a deferred cost asset within prepaid and other assets on the consolidated balance sheet as of December 31, 2019 and are being amortized into interest expense on a ratable basis over the term of the debt.

As of December 31, 2019, the debt is recorded at its carrying value of $38.6 million, net of issuance costs, including all amounts paid to third parties to secure the debt and the fair value of the warrants issued. The debt issuance costs are being amortized into interest expense over the five-year term utilizing the effective interest rate method. The total principal outstanding under the Term Loan as of December 31, 2019 is $45.0 million.

The Company has an Inventory Financing Agreement with a key inventory and instrument components supplier whereby the Company may draw up to $3.0 million for the purchase of inventory to accrue interest at a rate of LIBOR plus 8% subject to the same 10% floor and 13% ceiling. All principal will become due and payable upon maturity on November 6, 2023 and all interest will be paid monthly. The obligation outstanding under the Inventory Financing Agreement as of December 31, 2019 was $3.0 million.

The Company has one outstanding capital lease arrangement as of December 31, 2019. The lease bears interest at an annual rate of 6.4% and is due in monthly principal and interest installments, collateralized by the related equipment, and matures in December 2022.

	December 31,
	2019			2018
Amended Credit Facility with MidCap	$	12,785		$	11,010
Inventory Financing		2,987			—
Squadron Term Loan		45,000			35,000
Notes payable		457			296
Convertible note		—			3,000
Total		61,229			49,306
Add: capital leases		101			126
Less: debt discount		(7,393	)		(3,857	)
Total		53,937			45,575
Less: current portion of long-term debt		(489	)		(3,276	)
Total long-term debt, net of current portion	$	53,448		$	42,299

Principal payments on debt are as follows as of December 31, 2019 (in thousands):

Year Ending December 31,
2020	$	458
2021		4,483
2022		20,471
2023		35,817
2024 and thereafter		—
Total		61,229
Add: capital lease principal payments		101
Less: debt discount		(7,393	)
Total		53,937
Less: current portion of long-term debt		(489	)
Long-term debt, net of current portion	$	53,448