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Share-Based Compensation - Summary of Key Terms and Conditions of Share-Based Compensation Based on Stock Options (Details) | 12 Months Ended
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Dec. 31, 2021 shares € / shares | Dec. 31, 2021 shares $ / shares | Dec. 31, 2020 shares € / shares | Dec. 31, 2019 shares € / shares | Dec. 31, 2018 shares € / shares | Dec. 31, 2017 shares € / shares | Dec. 31, 2016 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 |  |  |
Excercise price (in EUR per share) | € / shares |  |  |  | € 12.32 |  |  |
Vesting period | From 10/20/2021 to 10/20/2024 | From 10/20/2021 to 10/20/2024 |  |  |  |  |
Exercice period | From 10/21/2024 to 10/21/2031 | From 10/21/2024 to 10/21/2031 |  |  |  |  |
Valuation method used |  |  |  | Black & Scholes |  |  |
Expected dividends |  |  |  | 0.00% |  |  |
Expected volatility |  |  |  | 40.00% |  |  |
Risk-free interest rate |  |  |  | 0.00% |  |  |
Employees and Officers |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Date of the Shareholders meeting | Jun. 30, 2021 | Jun. 30, 2021 |  |  |  |  |
Date of the Management Board meeting | Oct. 18, 2021 | Oct. 18, 2021 |  |  |  |  |
Date of the CEO decision | Oct. 19, 2021 | Oct. 19, 2021 |  |  |  |  |
Valuation method used | Black-Scholes | Black-Scholes |  |  |  |  |
S O | Officers |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Date of the Shareholders meeting |  |  | Nov. 27, 2019 |  |  |  |
Date of the decision and delegation of the Board of Directors to the CEO |  |  | Dec. 11, 2020 |  |  |  |
Date of the CEO decision |  |  | Dec. 11, 2020 |  |  |  |
Total number of SO subscribed | 35,000 | 35,000 | 35,000 |  |  |  |
Total number of SO voided | 0 | 0 | 0 |  |  |  |
Total number of SO definitively vested | 0 | 0 | 0 |  |  |  |
Total number of SO remaining | 35,000 | 35,000 | 35,000 |  |  |  |
Excercise price (in EUR per share) | (per share) |  | $ 3.26 | € 4.38 |  |  |  |
Vesting period |  |  | From 12/31/2020 to 12/31/2023 |  |  |  |
Exercice period |  |  | From 01/01/2024 to 12/31/2027 |  |  |  |
Fair value | € / shares | € 1.06 |  | € 1.16 |  |  |  |
Valuation method used | Black-Scholes | Black-Scholes |  |  |  |  |
Price of the share at the time of allocation | (per share) |  | $ 3.24 | € 3.99 |  |  |  |
Expected dividends |  |  | 0.00% |  |  |  |
Expected volatility |  |  | 49.00% |  |  |  |
Risk-free interest rate |  |  | (0.70%) |  |  |  |
Turnover rate |  |  | 0.00% |  |  |  |
S O | Employees |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Total number of SO subscribed | 134,375 | 134,375 | 103,750 |  |  |  |
Total number of SO voided | 0 | 0 | 0 |  |  |  |
Total number of SO definitively vested | 0 | 0 | 0 |  |  |  |
Total number of SO remaining | 134,375 | 134,375 | 103,750 |  |  |  |
Excercise price (in EUR per share) | (per share) |  | $ 2.61 | € 3.50 |  |  |  |
Fair value | € / shares | € 1.30 |  | € 1.46 |  |  |  |
Price of the share at the time of allocation | $ / shares |  | $ 3.24 |  |  |  |  |
S O | Employees and Officers |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Expected dividends | 0.00% | 0.00% |  |  |  |  |
Expected volatility | 50.00% | 50.00% |  |  |  |  |
Risk-free interest rate | (0.59%) | (0.59%) |  |  |  |  |
Turnover rate | 0.00% | 0.00% |  |  |  |  |
SO US | Employees |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Total number of SO subscribed | 32,500 | 32,500 | 56,250 |  |  |  |
Total number of SO voided | 7,500 | 7,500 | 0 |  |  |  |
Total number of SO definitively vested | 0 | 0 | 0 |  |  |  |
Total number of SO remaining | 25,000 | 25,000 | 48,750 |  |  |  |
Excercise price (in EUR per share) | (per share) |  | $ 3.22 | € 4.52 |  |  |  |
Fair value | € / shares | € 1.07 |  | 1.12 |  |  |  |
Price of the share at the time of allocation | (per share) |  | $ 3.24 | € 3.99 |  |  |  |
Expected dividends | 0.00% | 0.00% | 0.00% |  |  |  |
Expected volatility | 50.00% | 50.00% | 49.00% |  |  |  |
Risk-free interest rate | (0.59%) | (0.59%) | (0.70%) |  |  |  |
Turnover rate | 0.00% | 0.00% | 0.00% |  |  |  |
SO 2019 | Employees and Officers |  |  |  |  |  |  |
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 |  |  |  | Jul. 18, 2019 |  |  |
Date of the CEO decision |  |  |  | Jul. 18, 2019 |  |  |
Total number of SO subscribed |  |  |  | 107,880 |  |  |
Total number of SO voided |  |  |  | 13,350 |  |  |
Total number of SO definitively vested |  |  |  | 0 |  |  |
Total number of SO remaining |  |  |  | 94,530 |  |  |
Excercise price (in EUR per share) | € / shares |  |  |  | € 13.99 |  |  |
Vesting period |  |  |  | From 07/18/2019 to 09/16/2022 and From 11/27/2019 to 01/16/2023 |  |  |
Exercice period |  |  |  | From 09/17/2022 to 09/17/2029 and From 01/17/2023 to 01/17/2030 |  |  |
Fair value | € / shares |  |  |  | € 4.59 |  |  |
Price of the share at the time of allocation | € / shares |  |  |  | € 17.06 |  |  |
Expected dividends |  |  |  | 0.00% |  |  |
Risk-free interest rate |  |  |  | 0.00% |  |  |
Turnover rate |  |  |  | 0.00% |  |  |
SO US 1 | Employees |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Date of the Shareholders meeting |  |  |  | Nov. 27, 2019 |  |  |
Date of the decision and delegation of the Board of Directors to the CEO |  |  |  | Nov. 27, 2019 |  |  |
Date of the CEO decision |  |  |  | Nov. 27, 2019 |  |  |
Total number of SO subscribed |  |  |  | 30,620 |  |  |
Total number of SO voided |  |  |  | 7,000 |  |  |
Total number of SO definitively vested |  |  |  | 0 |  |  |
Total number of SO remaining |  |  |  | 23,620 |  |  |
Excercise price (in EUR per share) | € / shares |  |  |  | € 16.90 |  |  |
Fair value | € / shares |  |  |  | € 3.67 |  |  |
SO US 2 | Employees |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Total number of SO subscribed |  |  |  | 13,350 |  |  |
Total number of SO voided |  |  |  | 4,450 |  |  |
Total number of SO definitively vested |  |  |  | 0 |  |  |
Total number of SO remaining |  |  |  | 8,900 |  |  |
Excercise price (in EUR per share) | € / shares |  |  |  | € 14.31 |  |  |
Fair value | € / shares |  |  |  | 3.23 |  |  |
Price of the share at the time of allocation | € / shares |  |  |  | € 14.50 |  |  |
Expected dividends |  |  |  | 0.00% |  |  |
Expected volatility |  |  |  | 40.00% |  |  |
Risk-free interest rate |  |  |  | 0.00% |  |  |
Turnover rate |  |  |  | 0.00% |  |  |
SO 2018 | Employees and Officers |  |  |  |  |  |  |
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 |  |  |  |  | Nov. 07, 2018 |  |
Date of the CEO decision |  |  |  |  | Nov. 07, 2018 |  |
Total number of SO subscribed |  |  |  |  | 122,000 |  |
Total number of SO voided |  |  |  |  | 50,322 |  |
Total number of SO definitively vested |  |  |  |  | 0 |  |
Total number of SO remaining |  |  |  |  | 71,678 |  |
Excercise price (in EUR per share) | € / shares |  |  |  |  | € 16.00 |  |
Vesting period |  |  |  |  | From 11/07/2018 to 12/31/2021 |  |
Exercice period |  |  |  |  | From 01/01/2022 to 12/31/2028 |  |
Fair value | € / shares |  |  |  |  | € 9.32 |  |
Price of the share at the time of allocation | € / shares |  |  |  |  | € 22.12 |  |
Expected dividends |  |  |  |  | 0.00% |  |
Expected volatility |  |  |  |  | 44.10% |  |
Risk-free interest rate |  |  |  |  | 0.00% |  |
Turnover rate |  |  |  |  | 15.00% |  |
SO US 2018 | Employees |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Total number of SO subscribed |  |  |  |  | 17,500 |  |
Total number of SO voided |  |  |  |  | 7,787 |  |
Total number of SO definitively vested |  |  |  |  | 0 |  |
Total number of SO remaining |  |  |  |  | 9,713 |  |
Excercise price (in EUR per share) | € / shares |  |  |  |  | € 21.65 |  |
Fair value | € / shares |  |  |  |  | € 6.90 |  |
SO 1 et 2 2017 | Employees and Officers |  |  |  |  |  |  |
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 |
Total number of SO subscribed |  |  |  |  |  | 96,250 |
Total number of SO voided |  |  |  |  |  | 35,273 |
Total number of SO definitively vested |  |  |  |  |  | 60,977 |
Total number of SO remaining |  |  |  |  |  | 0 |
Excercise price (in EUR per share) | € / shares |  |  |  |  |  | € 17.91 |
Vesting period |  |  |  |  |  | From 12/06/2017 to 12/31/2020 |
Exercice period |  |  |  |  |  | From 01/01/2021 to 12/31/2027 |
Fair value | € / shares |  |  |  |  |  | € 9.32 |
Price of the share at the time of allocation | € / shares |  |  |  |  |  | € 21.95 |
Expected dividends |  |  |  |  |  | 0.00% |
Expected volatility |  |  |  |  |  | 53.70% |
Risk-free interest rate |  |  |  |  |  | 0.00% |
Turnover rate |  |  |  |  |  | 15.00% |
SO US 2017 | Employees |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Total number of SO subscribed |  |  |  |  |  | 13,000 |
Total number of SO voided |  |  |  |  |  | 13,000 |
Total number of SO definitively vested |  |  |  |  |  | 0 |
Total number of SO remaining |  |  |  |  |  | 0 |
Excercise price (in EUR per share) | € / shares |  |  |  |  |  | € 22.54 |
SO US 2016 | Employees and Officers |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Date of the Shareholders meeting |  |  |  |  |  |  | Jun. 21, 2016
Date of the Management Board meeting |  |  |  |  |  |  | Dec. 15, 2016
Total number of SO subscribed |  |  |  |  |  |  | 62,875
Total number of SO voided |  |  |  |  |  |  | 13,169
Total number of SO definitively vested |  |  |  |  |  |  | 49,706
Total number of SO remaining |  |  |  |  |  |  | 0
Excercise price (in EUR per share) | € / shares |  |  |  |  |  |  | € 15.79
Vesting period |  |  |  |  |  |  | From 12/15/2016 to 12/15/2019
Exercice period |  |  |  |  |  |  | From 12/16/2019 to 12/16/2026
Fair value | € / shares |  |  |  |  |  |  | € 10.30
Price of the share at the time of allocation | € / shares |  |  |  |  |  |  | € 20.79
Expected dividends |  |  |  |  |  |  | 0.00%
Expected volatility |  |  |  |  |  |  | 63.00%
Risk-free interest rate |  |  |  |  |  |  | 0.00%
Turnover rate |  |  |  |  |  |  | 15.00%
SO US 2016 | Employees |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Total number of SO subscribed |  |  |  |  |  |  | 10,500
Total number of SO voided |  |  |  |  |  |  | 10,500
Total number of SO definitively vested |  |  |  |  |  |  | 0
Total number of SO remaining |  |  |  |  |  |  | 0
Excercise price (in EUR per share) | € / shares |  |  |  |  |  |  | € 21.12
Fair value | € / shares |  |  |  |  |  |  | € 8.52

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