Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue (note 10)	$ 8,124	$ 6,554	$ 14,700	$ 27,016
Operating expenses:
Research and development	18,891	13,045	53,576	35,556
General and administrative	4,831	3,208	15,279	9,838
Total operating expenses	23,722	16,253	68,855	45,394
Loss from operations	(15,598)	(9,699)	(54,155)	(18,378)
Other income (expense):
Interest income	76	166	203	2,194
Interest expense				(484)
Foreign exchange gain (loss)	(128)	475	144	899
Loss on repayment of term loan (note 8)				(988)
Loss before income taxes	(15,650)	(9,058)	(53,808)	(16,757)
Income tax recovery (note 11)	205	203	490	243
Net loss and comprehensive loss	(15,445)	(8,855)	(53,318)	(16,514)
Net loss attributable to preferred shareholders	(362)	(250)	(1,308)	(474)
Net loss attributable to common shareholders	$ (15,083)	$ (8,605)	$ (52,010)	$ (16,040)
Net loss per common share (note 4):
Basic and diluted	$ (0.36)	$ (0.25)	$ (1.29)	$ (0.47)
Weighted-average common shares outstanding (note 4):
Basic and diluted	41,193,267	34,994,944	39,599,595	34,387,986