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Business Combination - Schedule of Summarizes the Purchase Price in the Merger (Details) - USD ($) $ in Thousands | Sep. 15, 2020 | Jun. 30, 2021 | Dec. 31, 2020
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Business Acquisition [Line Items] |  |  |
Contingent consideration liability |  |  | $ 980
resTORbio |  |  |
Business Acquisition [Line Items] |  |  |
Fair value of common stock shares of the combined company owned by resTORbio stockholders | $ 84,142 |  |
Contingent consideration liability | 2,880 |  |
Purchase price | $ 87,022 |  |

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