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Accrued expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued expenses    
Employee compensation costs $ 3,780 $ 3,383
Research and development costs 3,555 5,780
Professional services 1,448 1,762
Accrued goods and services 784 388
Patent costs 120 120
Other 101 64
Total $ 9,788 $ 11,497