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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] |  |
Refundable FDA filing fee |  | $ 2,876
Short-term deposits | $ 2,293 | 2,360
Prepaid insurance | 954 | 415
Research and development tax credit receivable | 877 | 801
Interest receivable | 136 |
Other prepaid assets | 132 | 231
Prepaid research and development expenses | 51 | 157
Value added tax receivable | 14 | 64
Deferred financing expenses | 45 |
Total | $ 4,502 | $ 6,904

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