Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.20.2
Related-Party Transactions - Additional Information (Detail) - Cellectis [Member] - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Related Party Transaction [Line Items]        
Minimum net worth required $ 300,000,000   $ 300,000,000  
General and Administrative Expense [Member]        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party $ 100,000 $ 300,000 200,000 $ 1,100,000
License and Royalty Fees [Member]        
Related Party Transaction [Line Items]        
Related party transaction, expenses from transactions with related party     $ 100,000