Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Stock-Based Compensation Granted as Deemed Dividends (Detail)

v3.19.3
Stock-Based Compensation - Summary of Stock-Based Compensation Granted as Deemed Dividends (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Nonemployee Restricted Stock Units [Member] | Cellectis [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deemed dividends from grants to Cellectis employees $ 296 $ 415 $ 1,072 $ 1,790