Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.19.3
Related-Party Transactions - Additional Information (Detail) - Cellectis [Member] - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
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 $ 305,000 $ 1,000,000 $ 1,100,000 $ 2,000,000