Accrued expenses consisted of the following as of June 30, 2018 and December 31, 2017 (in thousands):
June 30, 2018
December 31, 2017
External research and preclinical development
$
6,976
5,875
Employee compensation and benefits
1,512
2,494
Professional fees
363
1,225
Facilities and other
84
134
8,935
9,728
No definition available.
Tabular disclosure of the components of accrued liabilities.