Accrued expenses (Tables)

9 Months Ended

Sep. 30, 2017

Accrued expenses

Schedule of accrued expenses

Accrued expenses as of September 30, 2017 and December 31, 2016 consist of the following:

	As of September 30,		As of December 31,
	2017		2016
	(in thousands)
External research and development costs	$	6,447	$	2,384
Employee compensation costs		2,486		2,399
Professional services		1,020		698
Accrued goods and services		309		842
Patent costs		180		89
Other		51		76
Total	$	10,493	$	6,488