Research Premium and Grant Revenue (Tables)

12 Months Ended

Dec. 31, 2017

Research Premium and Grant Revenue

Schedule of research premium and grant revenue

	Year ended December 31,
(in thousands)	2015		2016		2017
Research premium	$	3,594	$	6,232	$	4,842
Government grants		67		—		369
Grants from WWFF and ZIT		106		250		108
Total	$	3,767	$	6,482	$	5,319