Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2017

Payables And Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consisted of the following:

	December 31, 2017		December 31, 2016
	(In thousands)
Employee compensation and benefits	$	4,773	$	2,703
Research and development and professional    expenses		3,226		3,197
Accrued expenses	$	7,999	$	5,900