Accrued expenses (Tables)

9 Months Ended

Sep. 30, 2019

Accrued expenses

Schedule of accrued expenses

	As of September 30,		As of December 31,
	2019		2018
	(in thousands)
Research and development costs	$	8,982	$	3,555
Employee compensation costs		4,588		3,780
Professional services		1,133		1,448
Accrued goods and services		1,646		784
Other		239		221
Total	$	16,588	$	9,788