Notes Payable (Tables)

6 Months Ended

Jun. 30, 2022

Debt Disclosure [Abstract]

Schedule of long-term debt, net of original issue discount and unamortized debt issuance costs

Our long-term debt, net of original issue discount and unamortized debt issuance costs, as of June 30, 2022 and December 31, 2021 was as follows:

	Stated			June 30,			December 31,
(in thousands, except interest rates)	Interest Rate			2022			2021
Notes payable:
Maryland Department of Housing & Community Development		8.00	%	$	634		$	614
Maryland Department of Housing & Community Development		6.00	%		694			—
Advance Cecil, Inc.		8.00	%		126			122
Avenue Venture Opportunities Fund, L.P.		11.35	%		20,000			20,000
					21,454			20,736
Accrued and unpaid interest					2			—
Less unamortized debt issuance costs and original issue discounts					(1,196	)		(1,654	)
Less convertible notes payable, net of unamortized debt discount and issuance costs					(4,709	)		(4,598	)
Total notes payable				$	15,551		$	14,484

Schedule of future payments under the 2021 Avenue Loan and under the 2022 MD Loan, net of unamortized debt discounts

Future payments under the 2021 Avenue Loan, net of unamortized debt discounts, if Avenue does not exercise the Conversion Feature, and under the 2022 MD Loan, net of unamortized debt discounts, are as follows:

(in thousands)	2021 Avenue Loan			2022 MD Loan
2022 (remainder)	$	—		$	—
2023		6,667			—
2024		13,333			—
2025		—			368
2026		—			326
2027		—			—
Thereafter		—			—
Subtotal of future principal payments		20,000			694
Accrued and unpaid interest		—			2
Less unamortized debt issuance costs and original issue discounts		(1,166	)		(30	)
Total	$	18,834		$	666