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Prepaid Expenses and Other Current Assets | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 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 consist of the following (in thousands):
|  | March 31, 2022 |  |  | December 31, 2021 |
Prepaid research and development costs |  | $ | 6,388 |  |  | $ | 6,143 |
Other prepaid expense and current assets |  |  | 3,586 |  |  |  | 2,049 |
Total prepaid expenses and other current assets |  | $ | 9,974 |  |  | $ | 8,192 |
| 6. Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consist of the following (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Prepaid research and development costs |  | $ | 6,143 |  |  | $ | 1,551 |
Other prepaid expense and current assets |  |  | 2,049 |  |  |  | 1,210 |
Total prepaid expenses and other current assets |  | $ | 8,192 |  |  | $ | 2,761 |

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