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Basis of presentation - Summary of Change in Presentation of the Warrants Resulted in the Following Impact to the Consolidated Statement of Loss (Detail) - EUR (€) € / shares in Units, € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Impact On The Income Statement Due To Change In The Fair Value Of Warrants [Line Items] |  |  |  |
Change in fair value of warrant liabilities | € 17,775 |  |  |
Financial result | (142,126) | 526 |  | 2,054
Loss before taxes | (211,841) | (32,487) | [1] | (32,355)
Taxes on income | 0 | 0 |  | 0
Net loss | (211,841) | (32,487) |  | (32,355)
Attributable to: |  |  |  |
Equity holders of the parent | (211,284) | (31,571) |  | (31,444)
Non-controlling interest | (557) | (916) |  | (911)
Net loss | € (211,841) | € (32,487) |  | € (32,355)
Net loss per share—basic and diluted | € (4.40) | € (0.95) |  | € (0.95)
Weighted average shares outstanding—basic and diluted | 48,001,228 | 33,093,838 |  | 33,093,838
As previously reported |  |  |  |
Disclosure Of Impact On The Income Statement Due To Change In The Fair Value Of Warrants [Line Items] |  |  |  |
Financial result | € (159,900) |  |  |
Loss before taxes | (229,616) |  |  |
Taxes on income | 0 |  |  |
Net loss | (229,616) |  |  |
Attributable to: |  |  |  |
Equity holders of the parent | (229,059) |  |  |
Non-controlling interest | (557) |  |  |
Net loss | € (229,616) |  |  |
Net loss per share—basic and diluted | € (4.77) |  |  |
Weighted average shares outstanding—basic and diluted | 48,001,228 |  |  |
Adjustment |  |  |  |
Disclosure Of Impact On The Income Statement Due To Change In The Fair Value Of Warrants [Line Items] |  |  |  |
Change in fair value of warrant liabilities | € 17,775 |  |  |
Financial result | 17,775 |  |  |
Loss before taxes | 17,775 |  |  |
Taxes on income | 0 |  |  |
Net loss | 17,775 |  |  |
Attributable to: |  |  |  |
Equity holders of the parent | 17,775 |  |  |
Net loss | € 17,775 |  |  |
Net loss per share—basic and diluted | € 0.37 |  |  |
[1] | See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets

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