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Major Events in the Period and Events After the Period - Additional Information (Details) |  |  |  |  |  |  |  |  |  | 1 Months Ended | 5 Months Ended | 12 Months Ended |  |  |  |  |  |
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Dec. 22, 2021 EUR (€) shares | Dec. 16, 2021 EUR (€) | Sep. 01, 2021 EUR (€) shares | Apr. 06, 2021 EUR (€) shares | Mar. 02, 2021 EUR (€) shares | Feb. 04, 2021 EUR (€) shares | Jan. 25, 2021 EUR (€) euroPerBond oCEANE | Nov. 23, 2020 euroPerBond oCEANE | Oct. 16, 2017 euroPerBond oCEANE | Nov. 30, 2021 EUR (€) | Jun. 30, 2021 EUR (€) bank | Jan. 31, 2021 EUR (€) shares | Dec. 31, 2020 EUR (€) employee shares | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€) loan shares | Dec. 31, 2020 EUR (€) employee shares | Dec. 31, 2019 EUR (€) shares | Dec. 01, 2021 EUR (€) | Nov. 23, 2021 EUR (€) | Jul. 31, 2021 EUR (€) | Jun. 24, 2021 EUR (€) | Jun. 30, 2020 employee | Dec. 31, 2018 EUR (€)
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract costs recognized |  |  |  |  |  |  |  |  |  |  |  |  | € 9,700,000 |  | € 3,300,000 | € 25,400,000 |  |  |  |  |  |  |
Expense of restructuring activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142,000 | 5,308,000 | € 0 |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 196,000 | 990,000 |  |  |  |  |  |  |
Increase in capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (59,680,000) | 11,129,000 | 356,000 |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | € 11,648,000 |  | € 9,015,000 | € 11,648,000 | € 16,453,000 |  |  |  |  |  | € 7,765,000
Number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  |  |  | 38,888,379 |  | 49,815,489 | 38,888,379 | 38,858,617 |  |  |  |  |  |
Fee and commission expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 2,303,000 | € 745,000 |  |  |  |  |  |  |
Clinical Trial Recruitment Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18 months |  |  |  |  |  |  |  |
Number of shares issued during period (in shares) | shares | 3,985,239 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
+ Proceeds from issue of share capital (net) | € 28,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | € 27,972,000 | 7,000 | € 126,486,000 |  |  |  |  |  |
Genfit | Ipsen |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |
Genoscience Pharma |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payments |  | € 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent milestone payments |  | € 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ipsen |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 40,000,000 |  |  | € 120,000,000 |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 80,000,000 |  |  |  |  |  |  |  |
Number of shares issued during period (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,985,239 |  |  |  |  |  |  |  |
Payment from collaboration, up-front cash payment, VAT |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 24,000,000 |  |  |  |  |  |  |  |
+ Proceeds from issue of share capital (net) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28,000,000 |  |  |  |  |  |  |  |
Ipsen | Collaboration and License Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue from collaboration, potential milestone payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 360,000,000 |  |  |  |  |  |  |  |
Royalty income, percent of collaborative sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Genoscience Pharma |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issue of ordinary shares |  | € 3,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PSE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision recognized for closing costs |  |  |  |  |  |  |  |  |  |  |  |  | € 1,326,000 |  |  | € 1,326,000 |  |  |  |  |  |  |
Restructuring provision |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Entity number of employees | employee |  |  |  |  |  |  |  |  |  |  |  |  | 130 |  |  | 130 |  |  |  |  |  | 203 |
Unused provision reversed, other provisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 352,000 |  |  |  |  |  |  |  |
Restructuring provision | PSE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other provisions |  |  |  |  |  |  |  |  |  |  |  |  | € 523,000 |  | 171,000 | € 523,000 |  |  |  |  |  |  |
Unused provision reversed, other provisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 352,000 |  |  |  |  |  |  |  |
Provision used, other provisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 189,000 |  |  |  |  |  |  |  |
RESOLVE-IT trial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-current provision closing cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 378,000 |  |  |  |  |  |  |
Other provisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000 |  |  |  |  |  |  |  |
Reversal of provisions for cost of restructuring |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 366,000 |  |  |  |  |  |  |  |
Provision used, other provisions |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 265,000 |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  | € (2,172,000) |  | (699,000) | € (2,172,000) | € 0 |  |  |  |  |  | € 0
Impairment | Fixtures And Fittings Premises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (596,000) |  |  |  |  |  |  |  |
OCEANE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Extension of maturity |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Buyback amount |  |  |  |  |  |  | € 47,480,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued interest portion of buyback amount (in EUR per share) | euroPerBond |  |  |  |  |  |  | 0.30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of debt instruments issued | oCEANE |  |  |  |  |  |  | 2,895,260 | 3,048,780 | 6,081,081 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nominal value per unit (in EUR per bond) | euroPerBond |  |  |  |  |  |  | 16.40 | 16.40 | 29.60 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt component of a new amended OCEANE (in EUR per bond) | euroPerBond |  |  |  |  |  |  | 24.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for partial buyback |  |  |  |  |  |  | € 47,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New shares created (in shares) | shares |  |  | 55,000 | 1,191,250 | 2,658,312 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in financial debt |  |  | € 200,000 | € 5,200,000 | € 11,660,000 | € 13,320,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares outstanding | shares |  |  |  |  |  |  |  |  |  |  |  | 1,923,662 |  |  |  |  |  |  |  |  |  |  |
Buyback of debt instruments, shareholder voting percentage to extend maturity term |  |  |  |  |  |  |  |  |  |  |  | 98.00% |  |  |  |  |  |  |  |  |  |  |
Conversion / exchange premium |  |  |  |  |  |  |  | 550.00% |  |  |  | 550.00% |  |  |  | 100.00% |  |  |  |  |  |  |
Issued capital, ordinary shares |  |  |  |  |  |  |  |  |  |  |  | € 11,457,562.5 |  |  | € 12,453,872.25 |  |  |  |  |  |  |  |
Number of shares issued and fully paid | shares |  |  |  |  |  |  |  |  |  |  |  | 45,830,250 |  |  | 49,815,489 |  |  |  |  |  |  |  |
Maximum dilution of convertible instruments, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18.00% |  |  |  |  |  |  |  |
Number of shares issued during period (in shares) | shares |  |  |  |  |  | 3,037,309 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pret Garanti Par L etat (PGE) Bancaire |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New debt recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 10,958,000 |  |  |  |  |  |  |  |
Nominal amount of the loan |  |  |  |  |  |  |  |  |  |  | € 11,000,000 |  |  |  |  |  |  |  |  | € 2,000,000 | € 11,000,000 |  |
Number Of Commercial Banks | bank |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |
Borrowings, Optional Repayment Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |
Subsidized Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New debt recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 2,250,000 |  |  |  |  |  |  |  |
Nominal amount of the loan |  |  |  |  |  |  |  |  |  | € 2,300,000 |  |  |  |  |  |  |  |  | € 2,250,000 |  |  |  |
Borrowings, Term |  |  |  |  |  |  |  |  |  | 6 years |  |  |  |  |  |  |  |  |  |  |  |  |
Loans Granted in Context of COVID-19 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New debt recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 15,300,000 |  |  |  |  |  |  |  |
Number Of Bank Loans | loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |
Leased equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 503,000 |  |  |  |  |  |  |
Right of use asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 62,000 |  |  |  |  |  |  |  |
Owned equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 363,000 |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 25,000 |  |  |  |  |  |  |  |
Rights of Use of Leased Premised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1,275,000 |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Major Events In The Period And Events After The Period [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract costs recognized |  |  |  |  |  |  |  |  |  |  |  |  |  | € 500,000 |  |  |  |  |  |  |  |  |

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