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Merger Accounting - Additional Information (Detail) - shares
May 28, 2020
Sep. 30, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Common stock, shares issued   17,710,450 15,367,730
Zafgen [Member]      
Business Acquisition [Line Items]      
Capital stock ownership percentage 34.00%    
Zafgen [Member] | Options to Purchase Common Stock [Member]      
Business Acquisition [Line Items]      
Options to purchase stock 328,770    
Chondrial Therapeutics Inc. [Member]      
Business Acquisition [Line Items]      
Capital stock ownership percentage 66.00%    
Merger Agreement [Member] | Zafgen [Member]      
Business Acquisition [Line Items]      
Common stock, shares issued 6,091,250