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Basis of presentation - Summary of Change in Presentation of the Warrants Resulted in the Following Impact to the Consolidated Balance Sheet Balance Sheet (Detail) - EUR (€) € in Thousands | Dec. 31, 2020 | Jul. 01, 2020 | Dec. 31, 2019 | [1] | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Disclosure Of Impact On The Consolidated Balance Sheet Due To Change In Presentation Of Warrants [Line Items] |  |  |  |  |
Total assets | € 254,646 |  | € 134,277 |  |
Other financial liabilities | 16,869 |  |  |  |
Total current liabilities | 77,478 |  | 69,296 |  |
Total non-current liabilities | 89,781 |  | 105,816 |  |
Total liabilities | 167,259 |  |  |  |
Shareholders' equity (deficit) |  |  |  |  |
Share capital | 629 | € 629 | 1,164 |  |
Share premium | 538,695 |  | 190,945 |  |
Accumulated deficit | (444,478) |  | (233,194) |  |
Other reserves | (7,459) |  | (770) |  |
Total equity (deficit) attributable to shareholders of the parent | 87,387 |  | (41,855) |  |
Total shareholders' equity (deficit) | 87,387 |  | (40,835) | € (9,171) | € (2,255)
Total liabilities and shareholders' equity (deficit) | 254,646 |  | € 134,277 |  |
As previously reported |  |  |  |  |
Disclosure Of Impact On The Consolidated Balance Sheet Due To Change In Presentation Of Warrants [Line Items] |  |  |  |  |
Total assets | 254,646 |  |  |  |
Total current liabilities | 60,609 |  |  |  |
Total non-current liabilities | 89,781 |  |  |  |
Total liabilities | 150,390 |  |  |  |
Shareholders' equity (deficit) |  |  |  |  |
Share capital | 629 |  |  |  |
Share premium | 573,339 |  |  |  |
Accumulated deficit | (462,253) |  |  |  |
Other reserves | (7,459) |  |  |  |
Total equity (deficit) attributable to shareholders of the parent | 104,256 |  |  |  |
Total shareholders' equity (deficit) | 104,256 |  |  |  |
Total liabilities and shareholders' equity (deficit) | 254,646 |  |  |  |
Adjustment |  |  |  |  |
Disclosure Of Impact On The Consolidated Balance Sheet Due To Change In Presentation Of Warrants [Line Items] |  |  |  |  |
Other financial liabilities | 16,869 |  |  |  |
Total current liabilities | 16,869 |  |  |  |
Total liabilities | 16,869 |  |  |  |
Shareholders' equity (deficit) |  |  |  |  |
Share premium | (34,645) |  |  |  |
Accumulated deficit | 17,775 |  |  |  |
Total equity (deficit) attributable to shareholders of the parent | (16,869) |  |  |  |
Total shareholders' equity (deficit) | € (16,869) |  |  |  |
[1] | See Note 2 for details regarding the change in presentation of Other financial assets

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