December 31, 2017 | December 31, 2016 | ||||
Accrued research and development costs including milestone payments | 4,060,048 | 4,307,089 | |||
Professional fees | 227,363 | 316,470 | |||
Accrued vacation & overtime | 69,455 | 115,749 | |||
Employee benefits incl. share based payments | 217,649 | 138,960 | |||
Board of Directors fees | — | 1,529 | |||
Other | 108,198 | 26,945 | |||
Total accrued expenses | 4,682,713 | 4,906,742 | |||