Revenue (Tables)

6 Months Ended

Jun. 30, 2019

Revenue

Summary of revenue by type

	Three Months Ended				Six Months Ended
	June 30,				June 30,
(in thousands)	2018		2019		2018		2019
Collaboration revenues	$	—	$	—	$	6,500	$	1,000
Research premium		709		351		1,479		744
Government grants		138		174		419		484
Total	$	847	$	525	$	8,398	$	2,228