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Accrued expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accrued expenses    
Research and development costs $ 8,982 $ 3,555
Employee compensation costs 4,588 3,780
Professional services 1,133 1,448
Accrued goods and services 1,646 784
Other 239 221
Total $ 16,588 $ 9,788