Ordinary shares - Share Purchase Agreement (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Class of Stock [Line Items]
Gross proceeds before discounts and commissions	$ 12,127	$ 2,716
Net proceeds				$ 14,843
Offering expenses	$ 400	$ 100
At the market offering | American Depositary Shares
Class of Stock [Line Items]
Shares issued (in shares)	520,000		0	620,000	0
Gross proceeds before discounts and commissions	$ 12,500			$ 15,300
Net proceeds	12,100			14,800
Offering expenses	$ 400			$ 500