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Non-controlling interests - Additional Information (Detail) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2020 EUR (€) shares | Jun. 30, 2020 EUR (€) | Dec. 31, 2020 EUR (€) € / shares | Dec. 31, 2019 EUR (€) | Dec. 31, 2018 EUR (€) | Jul. 01, 2020 $ / shares
Statements [Line Items] |  |  |  |  |  |  |
Par value per share | € / shares |  |  | € 0.01 |  |  |  |
Ownership interests held by non-controlling interests |  | 5.14% |  |  |  |  |
Stock issued during period, value, new issues |  | € 500,000 | € 0.01 |  |  |  |
Increase (decrease) through changes in noncontrolling interest |  | € 500,000 |  |  |  |  |
Loss on non-controlling interest |  |  | 600,000 | € 900,000 |  | € 900,000 |
Non-controlling interests |  |  | 0 | 1,020,000 | [1] | 1,200,000 |
MD Anderson compensation expense |  |  | € 45,000 | € 700,000 |  | € 1,360,000 |
Restricted Stock Acquisition Agreement [Member] |  |  |  |  |  |  |
Statements [Line Items] |  |  |  |  |  |  |
Stock issued during period, shares, acquisitions | shares | 697,431 |  |  |  |  |  |
ARYA [Member] |  |  |  |  |  |  |
Statements [Line Items] |  |  |  |  |  |  |
Par value per share | $ / shares |  |  |  |  |  |  | $ 15.15
Increase (decrease) through changes in noncontrolling interest | € 500,000 |  |  |  |  |  |
MD Anderson [Member] |  |  |  |  |  |  |
Statements [Line Items] |  |  |  |  |  |  |
Number of shares exchanged in subsidiaries | shares | 379,420 |  |  |  |  |  |
[1] | See Note 2 for details regarding the change in presentation of Other financial assets

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