Accounts receivable, net and other receivables (Tables)

12 Months Ended

Dec. 31, 2019

Accounts receivable, net and other receivables

Schedule of other current receivables

	As of December 31
(in thousands)	2018		2019
Research premium	$	2,657	$	1,530
VAT and other taxes		1,024		403
Receivables from grant revenue		104		2
Other receivables		86		809
Total accounts receivable, net and other receivables	$	3,871	$	2,744