Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2017

Payables and Accruals [Abstract]

Component of Accrued Expenses

Accrued expenses consist of the following:

	December 31,
(in thousands)	2017		2016
Clinical consulting services	$	3,022	$	2,342
Preclinical services		2,210		2,693
Employee compensation		1,919		1,446
Payroll taxes and benefits		1,017		646
Manufacturing services		902		1,116
Accrued vacation		361		294
Professional services		256		488
Other consulting services		222		28
Accrued rent		—		56
Total	$	9,909	$	9,109