Revenue (Tables)

3 Months Ended

Mar. 31, 2020

Revenue

Summary of revenue by type

	Three Months Ended
	March 31,
(in thousands)	2019		2020
Product revenue, net	$	—	$	156
Collaboration revenues		1,000		145
Research premium		393		290
Government grants		311		198
Total	$	1,703	$	789