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Financial Risk management - Exposure to foreign exchange risk (Details) € in Thousands, $ in Millions |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) contract | Jul. 15, 2020 USD ($) | Sep. 30, 2020 item | Jul. 31, 2020 USD ($) | Feb. 29, 2020 EUR (€) | Oct. 31, 2019 EUR (€) | Dec. 31, 2020 USD ($) contract | Dec. 31, 2020 EUR (€) | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€)
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from initial public offering |  | $ 107.7 |  | $ 107.7 | € 14,700 | € 8,900 |  |  |  |
Short-term deposits | € |  |  |  |  |  |  |  | € 12,001 | € 14,004 | € 41,767
Number Of Derivative Contracts Completed | 3 |  | 2 |  |  |  |  |  |  |
Notional amount | $ 60.0 |  |  |  |  |  | $ 60.0 |  |  |
Number of forward contracts that had change in fair value. | contract |  |  |  |  |  |  | 2 |  |  |
Change in fair value of future currency contracts | $ 60.0 |  |  |  |  |  | $ 60.0 |  |  |
USD |  |  |  |  |  |  |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |  |  |  |  |  |  |
Term of the short-term deposits | 6 months |  |  |  |  |  |  |  |  |
Short-term deposits | $ 9.0 |  |  |  |  |  | $ 9.0 | € 2,800 |  |

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