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Prepaid Expenses and Other Current Assets | 9 Months Ended
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Sep. 30, 2021
Prepaid Expense And Other Assets Current [Abstract] |
Prepaid Expenses and Other Current Assets | 6. Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consisted of the following (in thousands):
|  | September 30, 2021 |  |  | December 31, 2020 |
Prepaid maintenance and other |  | $ | 655 |  |  | $ | 761 |
Prepayments to CRO's |  |  | 1,643 |  |  |  | 420 |
Prepayments to CMO's |  |  | 1,340 |  |  |  | 135 |
Prepaid insurance |  |  | 449 |  |  |  | 1,443 |
Tax receivable |  |  | 2,711 |  |  |  | 2,711 |
Interest receivable |  |  | — |  |  |  | 23 |
Other current assets |  |  | 1 |  |  |  | 229 |
Total prepaid expenses and other current assets |  | $ | 6,799 |  |  | $ | 5,722 |

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