Accrued expenses consisted of the following as of September 30, 2018 and December 31, 2017 (in thousands):
September 30, 2018
December 31, 2017
External research and preclinical development
$
7,910
5,875
Employee compensation and benefits
2,461
2,494
Professional fees
695
1,225
Facilities and other
93
134
11,159
9,728
No definition available.
Tabular disclosure of the components of accrued liabilities.