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Long-Term Debt (Tables) | 9 Months Ended
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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 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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