Quarterly report pursuant to Section 13 or 15(d)

Related-Party Transactions - Additional Information (Detail)

v3.19.1
Related-Party Transactions - Additional Information (Detail) - Cellectis [Member] - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
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 $ 400,000 $ 600,000