Other expense - Schedule of Other Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Other Income And Expenses [Abstract]
Interest expense	$ (370)	$ (908)
Interest income	29	88
Change in fair value of derivative liability	0	(556)
Realized foreign exchange loss	0	1
Realized gain (loss) on disposal of equipment	42	(281)
Total other income (expenses)	$ (299)	$ (1,656)