Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Payables and Accruals [Abstract]

Component of Accrued Expenses

Accrued expenses consist of the following:

	December 31,
(in thousands)	2018		2017
Clinical consulting services	$	3,003	$	3,022
Employee compensation		1,786		1,919
Preclinical services		1,247		2,210
Manufacturing services		1,164		902
Professional services		745		256
Accrued vacation		363		361
Payroll taxes and benefits		349		1,017
Other consulting services		106		222
Total	$	8,763	$	9,909