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Trade Receivables and Other Current Assets and Receivables - Additional Information (Details) € in Thousands, $ in Millions | 9 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 EUR (€) | Dec. 31, 2020 EUR (€) contract | Feb. 10, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Dec. 31, 2017 EUR (€)
Trade Receivables and Other Current Assets and Receivables [Line Items] |  |  |  |  |  |  |  |
Research tax credits receivable from current tax year |  |  |  |  | € 4,800 |  |  |
Corrective claims for additional reimbursements of CIR, prior years |  | € 2,900 |  |  |  |  |  |
Short-term deposit accounts |  |  |  |  | 7,336 |  |  |
Maximum indemnification amount |  |  | € 2,000 |  |  |  |  |
Number of contracts under foreign currency forward | contract |  | 3 |  |  |  |  |  |
Amount of foreign currency forward contract | $ |  |  |  | $ 60.0 |  |  |  |
Deferral of insurance costs |  |  |  |  | 1,800 |  |  |
Tax receivables |  |  |  |  | 9,028 | € 9,833 | € 9,434 |
Receivable for current year |  |  |  |  |  | 4,293 |  |
Receivables from previous years not yet received |  |  |  |  |  |  | 4,171 | € 880
Corrective claims |  |  |  |  |  |  |  | 478
Receivables from previous years not yet received including corrective claim |  |  |  |  |  |  |  | € 4,513
Amount received for tax credit | € 3,633 |  |  |  |  |  |  |
Percentage of amount received for tax credit | 81.00% |  |  |  |  |  |  |
Prepaid expenses |  |  |  |  | 3,313 | € 495 | € 1,184 |
Socit Gnrale |  |  |  |  |  |  |  |
Trade Receivables and Other Current Assets and Receivables [Line Items] |  |  |  |  |  |  |  |
Short-term deposit accounts |  |  |  | 4.0 | 3,300 |  |  |
Crdit Agricole bank |  |  |  |  |  |  |  |
Trade Receivables and Other Current Assets and Receivables [Line Items] |  |  |  |  |  |  |  |
Short-term deposit accounts |  |  |  | $ 5.0 | € 4,100 |  |  |

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