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Business Combination - Schedule of changes in the Company's IPR&D and CVR since the Merger (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 15, 2020
--- | --- | --- | ---
In Process Research and Development |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Fair value | $ 0 | $ 1,190 | $ 3,490
In Process Research and Development | Change in Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Fair value | (1,190) | (2,300) |
Contingent Value Rights Agreement |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Fair value | 0 | 980 | $ 2,880
Contingent Value Rights Agreement | Change in Fair Value |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Fair value | $ (980) | $ (1,900) |

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