Accrued expenses

3 Months Ended

Mar. 31, 2018

Accrued expenses

Accrued expenses

5. Accrued expenses

Accrued expenses as of March 31, 2018 and December 31, 2017 consist of the following:

	As of March 31,		As of December 31,
	2018		2017
	(in thousands)
Research and development costs	$	4,665	$	5,780
Professional services		1,824		1,762
Employee compensation costs		1,726		3,383
Accrued goods and services		951		388
Patent costs		120		120
Other		65		64
Total	$	9,351	$	11,497