| Cover Page | 12 Months Ended |
| Dec. 31, 2022 shares |
| Document Information [Line Items] | |
| Document Type | 20-F/A |
| Amendment Flag | true |
| Document Period End Date | Dec. 31, 2022 |
| Document Fiscal Year Focus | 2022 |
| Document Fiscal Period Focus | FY |
| Entity Registrant Name | CELLECTIS S.A. |
| Entity Central Index Key | 0001627281 |
| Current Fiscal Year End Date | --12-31 |
| Entity Well-known Seasoned Issuer | No |
| Entity Current Reporting Status | Yes |
| Entity Filer Category | Accelerated Filer |
| Entity Common Stock, Shares Outstanding | 45,675,968 |
| Entity Shell Company | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Ordinary shares, nominal value €0.05 per share |
| Security Exchange Name | NASDAQ |
| Document Registration Statement | false |
| Document Annual Report | true |
| Document Transition Report | false |
| Document Shell Company Report | false |
| Entity Voluntary Filers | No |
| Entity Interactive Data Current | Yes |
| Entity Address, Country | FR |
| ICFR Auditor Attestation Flag | true |
| Entity Address, Address Line One | 8, rue de la Croix Jarry |
| Entity File Number | 001-36891 |
| Entity Incorporation, State or Country Code | I0 |
| Entity Address, City or Town | Paris |
| Entity Address, Postal Zip Code | 75013 |
| Document Accounting Standard | International Financial Reporting Standards |
| No Trading Symbol Flag | true |
| Auditor Firm ID | 1704 |
| Auditor Name | Ernst & Young et Autres |
| Auditor Location | Courbevoie, France |
| Amendment Description | This Amendment No. 1 on Form 20-F/A (this “Amendment”) amends the Annual Report on Form 20-F of Cellectis S.A. and its consolidated subsidiaries (the “Company”) for the year ended December 31, 2022, which was filed with the Securities and Exchange Commission on March 14, 2023 (the “Original Filing”).The Company is filing this Amendment solely for the purpose of updating the disclosure in Item 16G of Part II of the Original Filing. In accordance with Rule 12b-15 promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), Item 16G of Part II of the Original Filing is hereby amended and restated in its entirety. In addition, pursuant to Rule 12b-15 under the Exchange Act, the Company is including new certifications by the Company’s principal executive officer and principal financial officer as exhibits to this Amendment pursuant to Rule 13a-14(a) of the Exchange Act. Because no financial statements have been included in this Form 20-F/A and this Form 20-F/A does not contain or amend any disclosure with respect to Item 15, paragraphs 3, 4 and 5 of the certifications have been omitted. Except as described above or as otherwise expressly provided by the terms of this Amendment, no other changes have been made to the Original Filing. Except as otherwise indicated herein, this Amendment continues to speak as of the date of the Original Filing, and the Company has not updated the disclosures contained therein to reflect any events that occurred subsequent to the date of the Original Filing. |
| Business Contact [Member] | |
| Document Information [Line Items] | |
| Entity Address, Country | FR |
| Contact Personnel Name | Marie-Bleuenn Terrier |
| Entity Address, Address Line One | 8, rue de la Croix Jarry |
| Entity Address, City or Town | Paris |
| Entity Address, Postal Zip Code | 75013 |
| City Area Code | 33 |
| Local Phone Number | 1 81 69 16 00 |
| Contact Personnel Fax Number | +33 (0)1 81 69 16 06 |
| American Depositary Shares [member] | |
| Document Information [Line Items] | |
| Trading Symbol | CLLS |
| Title of 12(b) Security | American Depositary Shares, each representing one American Depository Shares, each representing one |
| Security Exchange Name | NASDAQ |
