Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Summary of Stock-based Compensation Expense, Recognized in Statements of Operations (Detail)

v3.8.0.1
Stock-Based Compensation - Summary of Stock-based Compensation Expense, Recognized in Statements of Operations (Detail) - Cellectis (Parent) [Member] - Equity Incentive Plan [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense $ 371 $ 948 $ 692
Selling, General and Administrative [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense 17 20 16
Research and Development [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Stock-based compensation expense $ 354 $ 928 $ 676