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Commitments and contingencies - Summary of Contractual Obligations (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Contractual Obligations [Line Items]    
Lease liabilities € 6,863 € 3,352
Other Lease Obligations 513 1,096
In-license agreements 249 655
Contract research organization agreements 1,924 2,597
Total contractual obligation 9,549 7,700
Less than 1year    
Disclosure Of Contractual Obligations [Line Items]    
Lease liabilities 2,103 1,482
Other Lease Obligations 97 172
In-license agreements 249 455
Contract research organization agreements 1,704 1,131
Total contractual obligation 4,153 3,240
1 - 3 years    
Disclosure Of Contractual Obligations [Line Items]    
Lease liabilities 3,453 1,823
Other Lease Obligations 185 324
In-license agreements 0 200
Contract research organization agreements 220 1,466
Total contractual obligation 3,858 3,813
3 - 5 years    
Disclosure Of Contractual Obligations [Line Items]    
Lease liabilities 1,157 47
Other Lease Obligations 185 300
In-license agreements 0 0
Contract research organization agreements 0  
Total contractual obligation 1,342 347
More than 5 years    
Disclosure Of Contractual Obligations [Line Items]    
Lease liabilities 150 0
Other Lease Obligations 46 300
In-license agreements 0 0
Contract research organization agreements 0  
Total contractual obligation € 196 € 300