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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)