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Prepaid Expenses, Other Current Assets and Other Noncurrent Assets | 12 Months Ended
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Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract] |
Prepaid Expenses, Other Current Assets and Other Noncurrent Assets | 5. Prepaid Expenses, Other Current Assets and Other Noncurrent Assets Prepaid expenses and other current assets consisted of the following as of (in thousands):
|  | December 31, |
|  | 2023 |  |  | 2022 |
Payroll tax credit |  | $ | 755 |  |  | $ | 948 |
Prepaid external research and development |  |  | 1,834 |  |  |  | 1,329 |
Research credit receivable |  |  | — |  |  |  | 116 |
Prepaid expenses |  |  | 427 |  |  |  | 421 |
Other |  |  | 83 |  |  |  | 146 |
Total prepaid expenses and other current assets |  | $ | 3,099 |  |  | $ | 2,960 |
Other noncurrent assets consisted of the following as of (in thousands):
|  | December 31, |
|  | 2023 |  |  | 2022 |
Deferred transaction costs |  | $ | 3,912 |  |  | $ | — |
Prepaid external research and development—long term |  |  | 676 |  |  |  | — |
Other |  |  | 23 |  |  |  | 108 |
Total other noncurrent assets |  | $ | 4,611 |  |  | $ | 108 |

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