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Prepaid Expenses and Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid Expense And Other Assets Current [Abstract] |  |
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 | 0 | 23
Other current assets | 1 | 229
Total prepaid expenses and other current assets | $ 6,799 | $ 5,722

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