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Stock-Based Compensation - Summary of Stock-Based Compensation Granted as Deemed Dividends (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nonemployee Restricted Stock Units [Member] | Cellectis [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deemed dividends from grants to Cellectis employee $ 289 $ 1,168 $ 1,358