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Share-Based Compensation - Summary of Key Terms and Conditions of Share-Based Compensation Based on Performance Conditions (Parenthetical) (Details) - SOD 2020 SOC2020 SOUS2020 | 12 Months Ended
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Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items] |
Percentage of exercisable instruments relating to the development of elafibranor in pbc and elative clinical | 50.00%
Percentage of exercisable instruments relating to the development of NTZ and the ACLF franchise | 15.00%
Percentage of exercisable instruments relating to the NIS4 diagnostic technology | 15.00%
Percentage of exercisable instruments relating to development of the product pipeline of the company | 20.00%
Percentage of exercisable instruments relating to NI4 diagnostics technology | 25.00%
Percentage of exercisable instruments relating to the development of company pipeline | 25.00%

X
- Definition Percentage of exercisable instruments relating to the development of the company's pipeline. + References No definition available. + Details
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X
- Definition Percentage of exercisable instruments relating to the development of elafibranor in pbc and the elative clinical. + References No definition available. + Details
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Namespace Prefix: | gnft_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Exercisable Instruments Relating To Development Of The Product Pipeline Of The Company + References No definition available. + Details
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Namespace Prefix: | gnft_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of exercisable instruments relating to the ni4 diagnostics technology. + References No definition available. + Details
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Namespace Prefix: | gnft_
Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition Percentage Of Exercisable Instruments Relating To The Development Of NTZ And The ACLF Franchise + References No definition available. + Details
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Namespace Prefix: | gnft_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Exercisable Instruments Relating To The NIS4 Diagnostic Technology + References No definition available. + Details
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Namespace Prefix: | gnft_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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