Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Assumptions used in Black-Scholes Model (Detail)

v3.8.0.1
Stock-Based Compensation - Summary of Assumptions used in Black-Scholes Model (Detail)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 0.00% 0.00% 0.00%
Risk-free interest rate, minimum 1.25% 0.64% 1.65%
Risk-free interest rate, maximum 2.39%    
Expected volatility, minimum 27.40% 30.00% 54.30%
Expected volatility, maximum 45.10%    
Expected life (in years)     5 years 6 months 10 days
Cellectis (Parent) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividend yield 0.00% 0.00% 0.00%
Risk-free interest rate, minimum 0.03% 0.16% 0.16%
Risk-free interest rate, maximum 0.94% 0.94% 0.94%
Expected volatility, minimum 59.09% 59.09% 59.09%
Expected volatility, maximum 65.64% 60.49% 60.49%
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (in years) 1 year 2 months 19 days 5 years 9 months  
Minimum [Member] | Cellectis (Parent) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (in years) 6 years 6 years 6 years
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (in years) 10 years 6 years 2 months 30 days  
Maximum [Member] | Cellectis (Parent) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (in years) 6 years 1 month 13 days 6 years 1 month 9 days 6 years 1 month 9 days