Accrued expenses (Tables)

9 Months Ended

Sep. 30, 2018

Accrued expenses

Schedule of accrued expenses

	As of September 30,		As of December 31,
	2018		2017
	(in thousands)
Research and development costs	$	3,775	$	5,780
Employee compensation costs		2,943		3,383
Professional services		824		1,762
Accrued goods and services		721		388
Patent costs		50		120
Other		42		64
Total	$	8,355	$	11,497