Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2017

Payables and Accruals [Abstract]

Components of accrued expenses

Accrued expenses consisted of the following (in thousands):

	December 31,
	2017		2016
Development costs	$	2,581	$	852
Employee compensation	735		352
Professional fees	463		413
Other	34		157
	$	3,813	$	1,774