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Share-based compensation - Costs (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2020
Aug. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 800,000 $ 0 $ 117,000 $ 1,000 $ 302,000 $ 11,000
Unrecognized compensation cost $ 1,500,000   1,500,000   $ 1,500,000  
Recognition period         2 years 9 months 25 days  
Research and development            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense     78,000 $ 1,000 $ 208,000 5,000
General and administrative            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense     $ 39,000   $ 94,000 $ 6,000