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Accrued expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued expenses    
Research and development costs $ 6,624 $ 13,248
Employee compensation costs 5,857 5,733
Professional services 1,153 897
Accrued goods and services 496 1,386
Other 75 252
Total $ 14,205 $ 21,516