Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Summary of Long Term Debt

Long-term debt consisted of the following:

(in thousands)	September 30, 2021		December 31, 2020
Principal amount of long-term debt	$	32,500	$	32,500
Debt discount, net of accretion	266		223
Cumulative accretion of end of term payments	970		455
Long-term debt	$	33,736	$	33,178
Less: current portion of long-term debt	$	(693)	$	—
Long-term debt, net of current portion	$	33,043	$	33,178

Interest Income and Interest Expense Disclosure

The Company recognized interest expense under the Hercules Loan Agreement as follows:

(dollars in thousands)	For the Three Months ended September 30,				For the Nine Months ended September 30,
	2021		2020		2021		2020
Total interest expense	$	920	$	697	$	2,716	$	1,967
Non-cash interest expense	$	193	$	138	$	557	$	390

Schedule of Future Principal Payments and the Final Payments Due

As of September 30, 2021, future principal payments due under the Hercules Loan Agreement were as follows (in thousands):

Year Ending December 31,	Total
2021	$	—
2022	—
2023	21,185
2024	11,315
Long-term debt	$	32,500