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License and Collaborations - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
License and Collaborations [Line Items]                
Stock shares issued during the period value       $ 48,411 $ 7      
Ares Agreement [Member] | Ares Trading S A [Member]                
License and Collaborations [Line Items]                
Milestone payments paid             $ 25,000  
Related party transaction, expenses from transactions with related party     $ 539     $ 1,256    
Payment for royalties on a licensed product, Term           2 years    
Ares Agreement [Member] | Ares Trading S A [Member] | Research and Development Expense [Member]                
License and Collaborations [Line Items]                
Non-refundable license issue fee             13,121  
Milestone payments recorded to research and development expense             25,000  
Ares Agreement [Member] | Ares Trading S A [Member] | Achievement Of Specified BLA Filing Or Regulatory Approval Milestones [Member]                
License and Collaborations [Line Items]                
Milestone payments payable             $ 176,500  
Ares Agreement [Member] | Ares Trading S A [Member] | Achievement Of Specified Commercial Milestones [Member]                
License and Collaborations [Line Items]                
Milestone payments payable   $ 515,000           $ 515,000
Series C [Member]                
License and Collaborations [Line Items]                
Temporary equity issue price per share $ 0.5918              
Series C [Member] | Ares Agreement [Member] | Ares Trading S A [Member]                
License and Collaborations [Line Items]                
Temporary equity stock shares issued during the period shares 22,171,553              
Temporary equity issue price per share $ 0.5918              
Temporary equity shares issued during the period value $ 13,121              
Yale University [Member]                
License and Collaborations [Line Items]                
Stock shares issued during the period shares   264,301            
Reimbursement for patent related expenses   $ 45            
Yale University [Member] | Portion at Fair Value Measurement [Member]                
License and Collaborations [Line Items]                
Stock shares issued during the period value               $ 100
PNAI [Member] | Yale License Agreement [Member]                
License and Collaborations [Line Items]                
Initial fee paid as consideration   $ 37            
PNAI [Member] | Yale License Agreement [Member] | Common Stock [Member]                
License and Collaborations [Line Items]                
Percentage of common stock issuable on a fully diluted and converted basis   5.00%           5.00%