Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Stock-Based Compensation - Parent Equity Incentive Plan - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value for stock options granted $ 2.42 $ 5.03 $ 1.02
Total fair value of stock options vested $ 6,700 $ 0 $ 0
Aggregate intrinsic value of stock options exercised $ 1,300 $ 0 $ 0
Equity Incentive Plan [Member] | Cellectis (Parent) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average grant date fair value for stock options granted $ 17.16 $ 0.00 $ 16.45
Total fair value of stock options vested $ 401 $ 900 $ 678
Aggregate intrinsic value of stock options exercised 0 0 0
Stock-based compensation expense 371 948 692
Equity Incentive Plan [Member] | Cellectis (Parent) [Member] | Stock Options and Warrants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 371 $ 948 $ 692