XML 55 R32.htm IDEA: XBRL DOCUMENT v3.20.1
Accrued expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued expenses    
Research and development costs $ 10,082 $ 13,248
Employee compensation costs 4,222 5,733
Accrued goods and services 1,637 1,386
Professional services 1,347 897
Other 130 177
Patent costs 75 75
Total $ 17,493 $ 21,516