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Related party disclosures - Summary of Compensation for the Supervisory Board (Detail) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items] |  |  |
Supervisory board compensation | € 282 | € 309 | € 410
Travel expenses | 4 | 107 | 68
Share-based compensation expense | 1,436 |  |
Payment Exit arrangement | 2,394 |  |
Total cash compensation | 4,116 | 416 | 478
Peter Chambre |  |  |
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items] |  |  |
Supervisory board compensation | 140 | 300 | 400
Travel expenses | 4 | 87 | 52
Share-based compensation expense | 1,046 |  |
Payment Exit arrangement | 2,394 |  |
Total cash compensation | 3,584 | 387 | 452
Harald F.Stock |  |  |
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items] |  |  |
Supervisory board compensation | 16 | 9 | 10
Travel expenses | 0 | 20 | 16
Share-based compensation expense | 0 |  |
Payment Exit arrangement | 0 |  |
Total cash compensation | 16 | € 29 | € 26
Michael G. Atieh |  |  |
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items] |  |  |
Supervisory board compensation | 28 |  |
Travel expenses | 0 |  |
Share-based compensation expense | 70 |  |
Payment Exit arrangement | 0 |  |
Total cash compensation | 98 |  |
Paul Carter |  |  |
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items] |  |  |
Supervisory board compensation | 26 |  |
Travel expenses | 0 |  |
Share-based compensation expense | 70 |  |
Payment Exit arrangement | 0 |  |
Total cash compensation | 96 |  |
Heather I. Mason |  |  |
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items] |  |  |
Supervisory board compensation | 20 |  |
Travel expenses | 0 |  |
Share-based compensation expense | 70 |  |
Payment Exit arrangement | 0 |  |
Total cash compensation | 90 |  |
Adam Stone |  |  |
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items] |  |  |
Supervisory board compensation | 20 |  |
Travel expenses | 0 |  |
Share-based compensation expense | 70 |  |
Payment Exit arrangement | 0 |  |
Total cash compensation | 90 |  |
Christoph Hettich |  |  |
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items] |  |  |
Supervisory board compensation | 20 |  |
Travel expenses | 0 |  |
Share-based compensation expense | 70 |  |
Payment Exit arrangement | 0 |  |
Total cash compensation | 90 |  |
Eliot Forster |  |  |
Disclosure of amounts incurred by entity for provision of key management personnel services provided by separate management entities [line items] |  |  |
Supervisory board compensation | 12 |  |
Travel expenses | 0 |  |
Share-based compensation expense | 40 |  |
Payment Exit arrangement | 0 |  |
Total cash compensation | € 52 |  |

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