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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Prepaid Expense And Other Assets Current [Abstract] |  |
Prepaid corporate insurance | $ 1,436 | $ 562
Prepaid other and other current assets | 432 | 373
Prepaid R&D costs | 187 | 333
Total prepaid expenses and other current assets | $ 2,055 | $ 1,268

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