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Related parties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related parties      
Shares issued   0  
Due from shareholder for issuance of redeemable convertible preferred stock     $ 6,520
Series D Preferred Stock      
Related parties      
Shares issued 50,670    
Proceeds from shares issued $ 7,400    
Common stock      
Related parties      
Shares issued 1,303,750    
Proceeds from shares issued $ 18,300    
Series B Preferred Stock      
Related parties      
Shares issued     61,524
Proceeds from shares issued     $ 4,000
Series C Preferred Stock      
Related parties      
Shares issued     147,712
Proceeds from shares issued     $ 12,600
University of Basel      
Related parties      
Research and development expenses 300 $ 400 300
Royalties paid $ 0 $ 0 $ 0