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Related parties - Additional information (Details)
€ / shares in Units, € in Thousands
1 Months Ended 12 Months Ended
Dec. 18, 2020
EquityInstruments
€ / shares
Dec. 01, 2020
USD ($)
Sep. 11, 2020
Options
Jul. 31, 2020
$ / shares
Jul. 31, 2020
EUR (€)
€ / shares
shares
Dec. 31, 2021
EUR (€)
USD ($)
€ / shares
Dec. 31, 2020
EUR (€)
€ / shares
shares
Dec. 31, 2019
EUR (€)
Options
€ / shares
Related parties                
Share-based payments           € 5,471 € 3,486 € 5,714
Payables due to holders of vested options               € 2,769
Net offering proceeds, after deducting underwriting discounts, commissions and transaction costs           22,000    
Follow-on Equity Offering                
Related parties                
Total number of shares issued and sold in follow-on public offering | shares         3,500,000      
COVID Testing Supplies Purchases                
Related parties                
Payments for services           5    
COVID Testing Services                
Related parties                
Revenues recognized in profit and loss           € 14    
Equity share option 2017 (Equity settled)                
Related parties                
Number of share options granted in share-based payment arrangement | Options               805,308
Exercise price of share options granted | € / shares           € 0.12 € 0.12 € 0.12
2019 Plan                
Related parties                
Exercise price of share options granted | € / shares € 0              
2019 Plan | RSUs                
Related parties                
Number of other equity instruments granted in share-based payment arrangement | EquityInstruments 300,000              
Supervisory board members                
Related parties                
Share-based payments           € 2,564 € 2,172 € 704
Supervisory board members | Supervisory board activities                
Related parties                
Payments for services           688 603 499
Supervisory board members | Corporate strategy services                
Related parties                
Payments for services               152
Member of the supervisory board | Corporate strategy services                
Related parties                
Payments for services           0 0  
Key management personnel                
Related parties                
Accrued for key management compensation             1,325 € 769
Receivables of related to the exercise of options           0 561  
Key management personnel | Equity share option 2017 (Equity settled)                
Related parties                
Pension commitments for members of the management board           € 0    
Key management personnel | 2019 Plan | RSUs                
Related parties                
Number of other equity instruments granted in share-based payment arrangement     75,000     142,764    
Key management personnel | 2019 Plan | Options                
Related parties                
Number of share options granted in share-based payment arrangement     87,500     15,000    
Former CEO And Major Shareholder [Member] | Services                
Related parties                
Payments for services             11  
Payable for services             € 12  
Former Chief Executive Officer                
Related parties                
Additional share-based expenses           € 776    
Severance payout           € 565    
Former Chief Executive Officer | 2019 Plan | RSUs                
Related parties                
Number of other equity instruments granted in share-based payment arrangement   324,000 72,350          
Former Chief Executive Officer | 2019 Plan | Options                
Related parties                
Number of share options granted in share-based payment arrangement | Options     36,175          
Common shares                
Related parties                
Increase (decrease) in number of ordinary shares issued | shares             2,000,000  
Common shares | Follow-on Equity Offering                
Related parties                
Number of shares offered by existing shareholders | shares         1,500,000      
Public offering price (in dollars per share) | (per share)       $ 14.00 € 12.71      
Net offering proceeds, after deducting underwriting discounts, commissions and transaction costs         € 22,000      
The Company | Common shares | Follow-on Equity Offering                
Related parties                
Increase (decrease) in number of ordinary shares issued | shares         2,000,000