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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Related Party Transaction [Line Items]      
Minimum net worth required   $ 300,000,000  
General and Administrative Expense [Member]      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party $ 500,000 100,000 $ 800,000
License and Royalty Fees [Member]      
Related Party Transaction [Line Items]      
Related party transaction, expenses from transactions with related party   $ 100,000