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Share-Based Payments - Summary of Details of Free Shares (Parenthetical) (Detail) - shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 15, 2017 | Dec. 05, 2017
Top of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period (years) |  | 4 years | 4 years
Bottom of range [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period (years) |  | 1 year | 1 year
Viaskin Peanut [Member] | Top of range [member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | Half of the shares |  |
Vesting period (years) | 2 years |  |
Grant date twelve and thirteen [member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of free shares upon achievement of performance criteria, description | The acquisition of free shares is contingent for key and new employees upon the achievement of the two performance criteria |  |
Grant date twelve and thirteen [member] | Viaskin Milk [member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | Half |  |
Vesting period (years) | 2 years |  |
Grant date twelve and thirteen [member] | Viaskin Peanut [member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | Half |  |
Vesting period (years) | 2 years |  |
Grant date eight, nine, ten and eleven [member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One third |  |
Vesting period (years) | 2 years |  |
Acquisition of free shares upon achievement of performance criteria, description | The acquisition of free shares is contingent for all the employees, including Dr. Benhamou, upon the achievement of the three performance criteria |  |
Date of Grant 03/24/2015 [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of free shares upon achievement of performance criteria, description | The acquisition of free shares is contingent for all the employees, including Dr. Benhamou, upon the achievement of the three performance criteria |  |
Date of Grant 03/24/2015 [Member] | Viaskin Platform [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One third of the shares |  |
Vesting period (years) | 2 years |  |
Date of Grant 03/24/2015 [Member] | Phase II Miles Trial For Viaskin Milk [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One third of the shares |  |
Vesting period (years) | 2 years |  |
Date of Grant 03/24/2015 [Member] | Phase I I I Pepites Trial For Viaskin Peanut [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One third of the shares |  |
Vesting period (years) | 2 years |  |
Date of Grant Five [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of free shares upon achievement of performance criteria, description | The acquisition of free shares is contingent for the Key Managers, including Dr. Benhamou, upon the achievement of the two performance criteria |  |
Date of Grant Five [Member] | Viaskin Peanut [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | Half of the shares |  |
Vesting period (years) | 2 years |  |
Date of Grant Four [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of free shares upon achievement of performance criteria, description | The acquisition of free shares is contingent for the Key Managers, including Dr. Benhamou, upon the achievement of the three performance criteria |  |
Date of Grant Four [Member] | Adoption Of 2013 Free Share Allocation Plan [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One-third of the shares |  |
Vesting period (years) | 2 years |  |
Number of consecutive days | 5 |  |
Date of Grant Four [Member] | Adoption Of 2013 Free Share Allocation Plan [Member] | Bottom of range [member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Percentage increase in share price | 50.00% |  |
Date of Grant Four [Member] | Inclusion Of 100th Patient In VIPES Phase II Study [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One-third of the shares |  |
Vesting period (years) | 2 years |  |
Grant Date One And Two [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of free shares upon achievement of performance criteria, description | The acquisition of free shares is contingent for certain individuals (the "Key Managers"), including Dr. Benhamou, upon the achievement of the three performance criteria |  |
Grant Date One And Two [Member] | On achievement of phase three Pepites trial for Viaskin Peanut [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One-third of the shares |  |
Vesting period (years) | 2 years |  |
Grant Date One And Two [Member] | Inclusion Of 100th Patient In VIPES Phase II Study [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One-third of the shares |  |
Vesting period (years) | 2 years |  |
Grant Date One And Two [Member] | Inclusion Of First Patient In Viaskin Milk Phase II Study [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One-third of the shares |  |
Vesting period (years) | 2 years |  |
Grant Date One And Two [Member] | Achievement Of Principal Evaluation Criterion In VIPES Phase II Study [Member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of shares on achievement of performance criteria | One-third of the shares |  |
Vesting period (years) | 2 years |  |
Grant Date Fourteen And Fifteen [member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Acquisition of free shares upon achievement of performance criteria, description | The acquisition of free shares is contingent for key and new employees upon the achievement of the two performance criteria |  |
Grant Date Fourteen And Fifteen [member] | Viaskin Milk [member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period (years) | 2 years |  |
Acquisition of shares on achievement of performance criteria | 0 |  |
Grant Date Fourteen And Fifteen [member] | Viaskin Peanut [member] | Free Share [Member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period (years) | 2 years |  |
Acquisition of shares on achievement of performance criteria | 0 |  |

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