Accrued expenses (Tables)

12 Months Ended

Dec. 31, 2016

Accrued expenses

Schedule of accrued expenses

Accrued expenses consist of the following:

	As of December 31,
	2016		2015
	(in thousands)
Research and development costs	$	2,384	$	1,329
Employee compensation costs		2,399		1,338
Accrued goods and services		842		—
Professional services		698		350
Patent costs		89		235
Other		76		178
Total	$	6,488	$	3,430