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Property and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property and equipment      
Property and equipment, gross $ 10,174 $ 6,403  
Less: Accumulated depreciation (3,446) (2,066)  
Property and equipment, net 6,728 4,337  
Depreciation expense 1,443 640 $ 398
Leasehold improvements      
Property and equipment      
Property and equipment, gross 1,919 1,885  
Finance lease right of use assets      
Property and equipment      
Property and equipment, gross 1,967    
Construction in progress      
Property and equipment      
Property and equipment, gross 286    
Laboratory equipment      
Property and equipment      
Property and equipment, gross 4,555 3,443  
Furniture and fixtures      
Property and equipment      
Property and equipment, gross 524 352  
Computer equipment and software      
Property and equipment      
Property and equipment, gross $ 923 $ 723