Accrued expenses (Tables)

3 Months Ended

Mar. 31, 2020

Accrued expenses

Schedule of accrued expenses

Accrued expenses as of March 31, 2020 and December 31, 2019 consist of the following:

	As of March 31,		As of December 31,
	2020		2019
	(in thousands)
Research and development costs	$	10,082	$	13,248
Employee compensation costs		4,222		5,733
Accrued goods and services		1,637		1,386
Professional services		1,347		897
Other		130		177
Patent costs		75		75
Total	$	17,493	$	21,516