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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 Cash Flows (Detail) - EUR (€) € in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Impact On The Cash Flow Statement Due To Change In The Presentation Of Warrants [Line Items] |  |  |  |  |  |  |  |  |  |
Loss before taxes |  |  |  |  | € (211,841) |  | € (32,487) | [1] | € (32,355) |
Adjustment to reconcile net loss to net cash used in operating activities |  |  |  |  | 150,993 |  |  |  |  |
Net cash provided by/(used in) operating activities | € (11,450) |  | € (27,739) |  | (85,610) |  | 70,967 | [1] | 20,684 |
Net cash provided by/(used in) investing activities | (19,223) |  | 11,473 |  | (15,949) |  | (5,059) | [1] | (13,514) |
Net cash provided by/(used in) financing activities |  |  |  |  | 207,883 |  | (1,862) | [1] | 23,648 |
Net increase in cash and cash equivalents |  |  |  |  | 106,324 |  | 64,046 | [1] | 30,818 |
Cash and cash equivalents at beginning of period | 103,353 | [2] | 103,353 | [2] | 103,353 | [2] | 39,367 | [1] | 8,415 |
Effects of exchange rate changes on cash and cash equivalents |  |  |  |  | (2,147) |  | (60) | [1] | 134 |
Cash and cash equivalents at end of period |  |  |  |  | 207,530 |  | 103,353 | [2] | 39,367 | [1]
As previously reported |  |  |  |  |  |  |  |  |  |
Disclosure Of Impact On The Cash Flow Statement Due To Change In The Presentation Of Warrants [Line Items] |  |  |  |  |  |  |  |  |  |
Loss before taxes |  |  |  |  | (229,616) |  |  |  |  |
Adjustment to reconcile net loss to net cash used in operating activities |  |  |  |  | 168,768 |  |  |  |  |
Net cash provided by/(used in) operating activities | (28,286) |  | (11,716) |  | (85,610) |  | 68,045 |  | 7,583 |
Net cash provided by/(used in) investing activities | (2,387) |  | (4,550) |  | (15,949) |  | (2,137) |  | € (413) |
Net cash provided by/(used in) financing activities |  |  |  |  | 207,883 |  |  |  |  |
Net increase in cash and cash equivalents |  |  |  |  | 106,324 |  |  |  |  |
Cash and cash equivalents at beginning of period | € 103,353 |  | € 103,353 |  | 103,353 |  |  |  |  |
Effects of exchange rate changes on cash and cash equivalents |  |  |  |  | (2,147) |  |  |  |  |
Cash and cash equivalents at end of period |  |  |  |  | 207,530 |  | € 103,353 |  |  |
Adjustment |  |  |  |  |  |  |  |  |  |
Disclosure Of Impact On The Cash Flow Statement Due To Change In The Presentation Of Warrants [Line Items] |  |  |  |  |  |  |  |  |  |
Loss before taxes |  |  |  |  | 17,775 |  |  |  |  |
Adjustment to reconcile net loss to net cash used in operating activities |  |  |  |  | € (17,775) |  |  |  |  |
[1] | See Note 2 for details regarding the revision as a result of a correction in classification of Other financial assets
[2] | See Note 2 for details regarding the change in presentation of Other financial assets

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