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Prepaid Expenses and Other Current Assets (Tables) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract] |  |
Schedule of 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 |
| 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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- Definition Tabular disclosure of the amounts paid in advance for capitalized costs that will be expensed with the passage of time or the occurrence of a triggering event, and will be charged against earnings within one year or the normal operating cycle, if longer; the aggregate carrying amount of current assets, not separately presented elsewhere in the balance sheet; and other deferred costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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