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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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Adjustments to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Profit (loss)]

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