Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue (note 8)	$ 536	$ 2,218	$ 9,302	$ 6,576
Operating expenses:
Research and development	22,146	18,377	41,506	34,685
General and administrative	8,705	6,339	15,480	10,448
Total operating expenses	30,851	24,716	56,986	45,133
Loss from operations	(30,315)	(22,498)	(47,684)	(38,557)
Other income (expense):
Interest income	816	72	1,184	219
Unrealized fair value loss on marketable securities	(1,288)	(17)	(4,650)	(92)
Foreign exchange gain (loss)	(411)	117	(112)	272
Loss before income taxes	(31,198)	(22,326)	(51,262)	(38,158)
Income tax recovery	40	217	434	285
Net loss and comprehensive loss	(31,158)	(22,109)	(50,828)	(37,873)
Net loss attributable to preferred shareholders		(521)	(385)	(951)
Net loss attributable to common shareholders	$ (31,158)	$ (21,588)	$ (50,443)	$ (36,922)
Net loss per common share (note 3):
Basic	$ (0.55)	$ (0.51)	$ (0.91)	$ (0.94)
Diluted	$ (0.55)	$ (0.51)	$ (0.91)	$ (0.94)
Weighted-average common shares outstanding (note 3):
Basic	56,192,922	42,090,207	55,522,857	39,457,413
Diluted	56,192,922	42,090,207	55,522,857	39,457,413