Quarterly report pursuant to Section 13 or 15(d)

Property and equipment, net - Summary (Details)

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Property and equipment, net - Summary (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost $ 24,015 $ 23,069
Accumulated depreciation (3,671) (3,567)
Property and equipment, net 20,344 19,502
Laboratory equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 9,366 11,635
Office/computer equipment and furniture    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost 2,010 724
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Property and equipment, at cost $ 12,639 $ 10,710