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Organization and Summary of Significant Accounting Policies - Additional Information (Detail)
12 Months Ended
Dec. 31, 2020
USD ($)
Significant Accounting Policies [Line Items]  
Year founded 2010
Impairment of long-lived assets $ 0
Assumed dividend yield 0.00%
Cellectis [Member]  
Significant Accounting Policies [Line Items]  
Percentage of ownership in outstanding common stock 64.70%