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Accrued expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accrued expenses    
Research and development costs $ 3,775 $ 5,780
Employee compensation costs 2,943 3,383
Professional services 824 1,762
Accrued goods and services 721 388
Patent costs 50 120
Other 42 64
Total $ 8,355 $ 11,497