Other receivables (Tables)

12 Months Ended

Dec. 31, 2017

Other receivables

Schedule of other receivables

	As of December 31
(in thousands)	2016		2017
Research premium	$	5,346	$	5,124
VAT and other taxes		46		28
Receivables from grant revenue		144		231
Other receivables		25		19
Total current receivables	$	5,561	$	5,402