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Share-Based Compensation - Summary of Key Terms and Conditions of Share-Based Compensation Based on Share Warrants (Details) | 12 Months Ended
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Dec. 31, 2019 shares € / shares | Dec. 31, 2017 shares € / shares | Dec. 31, 2015 shares € / shares | Dec. 31, 2014 shares € / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Date of the Shareholders meeting | Jun. 15, 2018 |  |  |
Date of the decision and delegation of the Board of Directors to the CEO | Oct. 18, 2019 |  |  |
Date of the CEO decision | Oct. 31, 2019 |  |  |
Beneficiaries | Consultants |  |  |
Total number of BSAAR subscribed (in shares) | shares | 35,070 |  |  |
Total number of BSAAR voided (in shares) | shares | 0 |  |  |
Total number of BSAAR remaining (in shares) | shares | 35,070 |  |  |
Issue price (in EUR per share) | € 1.23 |  |  |
Excercise price (in EUR per share) | 12.32 |  |  |
Estimated fair value - according to IFRS 2 (in EUR per share) | € 0.75 |  |  |
End of exercise period | 05/31/2024 |  |  |
Valuation method used | Black & Scholes |  |  |
Expected dividends | 0.00% |  |  |
Expected volatility | 40.00% |  |  |
Risk-free interest rate | 0.00% |  |  |
Expected life | 8 months 12 days |  |  |
BSA-2017-A |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Date of the Shareholders meeting |  | Jun. 16, 2017 |  |
Date of the decision and delegation of the Board of Directors to the CEO |  | Nov. 21, 2017 |  |
Date of the CEO decision |  | Dec. 06, 2017 |  |
Beneficiaries |  | Consultants and officers |  |
Total number of BSAAR subscribed (in shares) | shares |  | 18,345 |  |
Total number of BSAAR voided (in shares) | shares |  | 0 |  |
Total number of BSAAR remaining (in shares) | shares |  | 18,345 |  |
Issue price (in EUR per share) |  | € 2.00 |  |
Excercise price (in EUR per share) |  | 19.97 |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  | € 3.78 |  |
End of exercise period |  | 06/30/2022 |  |
Valuation method used |  | Black & Scholes |  |
Expected dividends |  | 0.00% |  |
Expected volatility |  | 36.40% |  |
Risk-free interest rate |  | 0.00% |  |
Expected life |  | 6 years |  |
BSA-2017-B |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Date of the Shareholders meeting |  | Jun. 16, 2017 |  |
Date of the decision and delegation of the Board of Directors to the CEO |  | Nov. 21, 2017 |  |
Date of the CEO decision |  | Dec. 06, 2017 |  |
Beneficiaries |  | Consultants and officers |  |
Total number of BSAAR subscribed (in shares) | shares |  | 18,345 |  |
Total number of BSAAR voided (in shares) | shares |  | 0 |  |
Total number of BSAAR remaining (in shares) | shares |  | 18,345 |  |
Issue price (in EUR per share) |  | € 2.00 |  |
Excercise price (in EUR per share) |  | 19.97 |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  | € 3.81 |  |
End of exercise period |  | 07/15/2022 |  |
Valuation method used |  | Black & Scholes |  |
Expected dividends |  | 0.00% |  |
Expected volatility |  | 35.70% |  |
Risk-free interest rate |  | 0.00% |  |
Expected life |  | 6 years |  |
BSA 2015-A |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Date of the Shareholders meeting |  |  | Apr. 02, 2014 |
Date of the Management Board meeting |  |  | Jan. 09, 2015 |
Beneficiaries |  |  | Consultants and officers |
Total number of BSAAR subscribed (in shares) | shares |  |  | 12,860 |
Total number of BSAAR voided (in shares) | shares |  |  | 12,860 |
Total number of BSAAR remaining (in shares) | shares |  |  | 0 |
Issue price (in EUR per share) |  |  | € 0.01 |
Excercise price (in EUR per share) |  |  | € 35.95 |
End of exercise period |  |  | 05/31/2019 |
Valuation method used |  |  | Black & Scholes |
Expected dividends |  |  | 0.00% |
Expected volatility |  |  | 74.90% |
Risk-free interest rate |  |  | 0.40% |
Expected life |  |  | 4 years |
BSA 2015-A | Minimum |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  |  | € 25.33 |
BSA 2015-A | Maximum |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  |  | € 26.89 |
BSA 2015-B |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Date of the Shareholders meeting |  |  | Apr. 02, 2014 |
Date of the Management Board meeting |  |  | Jan. 09, 2015 |
Beneficiaries |  |  | Consultants and officers |
Total number of BSAAR subscribed (in shares) | shares |  |  | 12,860 |
Total number of BSAAR voided (in shares) | shares |  |  | 12,860 |
Total number of BSAAR remaining (in shares) | shares |  |  | 0 |
Issue price (in EUR per share) |  |  | € 0.01 |
Excercise price (in EUR per share) |  |  | € 35.95 |
End of exercise period |  |  | 11/30/2019 |
Valuation method used |  |  | Black & Scholes |
BSA 2015-B | Minimum |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  |  | € 25.33 |
BSA 2015-B | Maximum |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  |  | € 26.31 |
BSA 2014-A |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Date of the Shareholders meeting |  |  |  | Apr. 02, 2014
Date of the Management Board meeting |  |  |  | Jul. 24, 2014
Beneficiaries |  |  |  | Consultants and officers
Total number of BSAAR subscribed (in shares) | shares |  |  |  | 46,765
Total number of BSAAR voided (in shares) | shares |  |  |  | 46,765
Total number of BSAAR remaining (in shares) | shares |  |  |  | 0
Issue price (in EUR per share) |  |  |  | € 0.01
Excercise price (in EUR per share) |  |  |  | € 23.50
End of exercise period |  |  |  | 09/30/2018
Valuation method used |  |  |  | Black & Scholes
Expected dividends |  |  |  | 0.00%
Expected volatility |  |  |  | 74.90%
Risk-free interest rate |  |  |  | 0.40%
Expected life |  |  |  | 4 years
BSA 2014-A | Minimum |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  |  |  | € 15.61
BSA 2014-A | Maximum |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  |  |  | € 24.84
BSA 2014-B |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Date of the Shareholders meeting |  |  |  | Apr. 02, 2014
Date of the Management Board meeting |  |  |  | Jul. 24, 2014
Beneficiaries |  |  |  | Consultants and officers
Total number of BSAAR subscribed (in shares) |  |  |  | 46,765
Total number of BSAAR voided (in shares) | shares |  |  |  | 46,765
Total number of BSAAR remaining (in shares) | shares |  |  |  | 0
Issue price (in EUR per share) |  |  |  | € 0.01
Excercise price (in EUR per share) |  |  |  | € 23.50
End of exercise period |  |  |  | 02/28/2019
Valuation method used |  |  |  | Black & Scholes
BSA 2014-B | Minimum |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  |  |  | € 15.61
BSA 2014-B | Maximum |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |
Estimated fair value - according to IFRS 2 (in EUR per share) |  |  |  | € 24.85

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