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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Clinical trial expenses | $ 1,630 | $ 1,497
Insurance premiums | 890 | 845
Other | 223 | 328
Total prepaid expenses and other current assets | $ 2,743 | $ 2,670

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