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Related-Party Transactions - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 20, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Follow-on Public Offering [Member]        
Related Party Transaction [Line Items]        
Common stock, issued and sold 3,750,000      
Common stock issued price per share $ 4.00      
Cellectis [Member]        
Related Party Transaction [Line Items]        
Minimum net worth required   $ 300.0    
Cellectis [Member] | Maximum [Member]        
Related Party Transaction [Line Items]        
Threshold percentage of ownership in outstanding common stock to enact indemnification agreement   50.00%    
Cellectis [Member] | Follow-on Public Offering [Member]        
Related Party Transaction [Line Items]        
Common stock, issued and sold 1,250,000   1,250,000  
Common stock issued price per share     $ 4.00  
Management Fees [Member] | Cellectis [Member]        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party       $ 1.3