Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2017

Payables and Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consist of the following (in thousands):

	December 31,		December 31,
	2017		2016
Payroll and employee related expenses	$	1,902	$	1,551
Current portion of deferred rent and lease incentive	72		29
Collaboration and licensing	1,020		—
Accrued patent fees	268		415
Accrued external research and development costs	3,578		794
Accrued professional and consulting services	859		459
Accrued grant refund	175		152
Accrued interest	89		81
Other	617		440
Accrued expenses	$	8,580	$	3,921