Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Cellectis Equity Incentive Plan - Additional Information (Detail)

v3.19.3.a.u2
Stock-Based Compensation - Cellectis Equity Incentive Plan - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expenses $ 9,175,000 $ 4,385,000 $ 12,092,000
Cellectis [Member] | Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expenses   $ 100,000 $ 400,000