Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands		Total		Convertible Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	[1]
Balance at Dec. 31, 2019		$ 91,977		$ 7,732	$ 294,244	$ 40,646	$ (249,655)	$ (990)
Balance (in Shares) at Dec. 31, 2019				1,016,000	28,139,228
Net loss		(7,484)					(7,484)
Issuance of common shares, net of issuance costs (note 9a)		102,456			$ 102,456
Issuance of common shares, net of issuance costs (note 9a) (in shares)					6,759,187
Stock-based compensation expense		1,015				1,015
Issued pursuant to exercise of stock options		14			$ 607	(593)
Issued pursuant to exercise of of stock options (in Shares)					57,857
Balance at Mar. 31, 2020		187,978		$ 7,732	$ 397,307	41,068	(257,139)	(990)
Balance (in Shares) at Mar. 31, 2020				1,016,000	34,956,272
Balance at Dec. 31, 2019		91,977		$ 7,732	$ 294,244	40,646	(249,655)	(990)
Balance (in Shares) at Dec. 31, 2019				1,016,000	28,139,228
Net loss		$ (16,514)
Issued pursuant to exercise of of stock options (in Shares)	[2]	153,417
Balance at Sep. 30, 2020		$ 182,023		$ 7,732	$ 397,654	43,796	(266,169)	(990)
Balance (in Shares) at Sep. 30, 2020				1,016,000	34,994,946
Balance at Mar. 31, 2020		187,978		$ 7,732	$ 397,307	41,068	(257,139)	(990)
Balance (in Shares) at Mar. 31, 2020				1,016,000	34,956,272
Net loss		(175)					(175)
Stock-based compensation expense		1,472				1,472
Issued pursuant to exercise of stock options		23			$ 345	(322)
Issued pursuant to exercise of of stock options (in Shares)					38,518
Balance at Jun. 30, 2020		189,298		$ 7,732	$ 397,652	42,218	(257,314)	(990)
Balance (in Shares) at Jun. 30, 2020				1,016,000	34,994,790
Net loss		(8,855)					(8,855)
Stock-based compensation expense		$ 1,580				1,580
Issued pursuant to exercise of stock options					$ 2	(2)
Issued pursuant to exercise of of stock options (in Shares)		375	[2]		156
Balance at Sep. 30, 2020		$ 182,023		$ 7,732	$ 397,654	43,796	(266,169)	(990)
Balance (in Shares) at Sep. 30, 2020				1,016,000	34,994,946
Balance at Dec. 31, 2020		171,355		$ 7,732	$ 397,748	45,357	(278,492)	(990)
Balance (in Shares) at Dec. 31, 2020				1,016,000	35,012,125
Net loss		(15,764)					(15,764)
Issuance of common shares, net of issuance costs (note 9a)					$ 99,846
Issuance of common shares, net of issuance costs (note 9a) (in shares)					5,868,135
Issuance of common shares and pre-funded warrants, net of issuance costs (note 9a and note 9c)		118,615
Issuance of common shares and pre-funded warrant, net of issuance costs (note 9a and note 9c)						18,769
Stock-based compensation expense		1,965				1,965
Issued pursuant to exercise of stock options		106			$ 740	(634)
Issued pursuant to exercise of of stock options (in Shares)					82,455
Balance at Mar. 31, 2021		276,277		$ 7,732	$ 498,334	65,457	(294,256)	(990)
Balance (in Shares) at Mar. 31, 2021				1,016,000	40,962,715
Balance at Dec. 31, 2020		171,355		$ 7,732	$ 397,748	45,357	(278,492)	(990)
Balance (in Shares) at Dec. 31, 2020				1,016,000	35,012,125
Net loss		$ (53,318)
Issued pursuant to exercise of of stock options (in Shares)	[2]	386,708
Balance at Sep. 30, 2021		$ 248,939		$ 7,732	$ 504,386	69,621	(331,810)	(990)
Balance (in Shares) at Sep. 30, 2021				1,016,000	41,412,875
Balance at Mar. 31, 2021		276,277		$ 7,732	$ 498,334	65,457	(294,256)	(990)
Balance (in Shares) at Mar. 31, 2021				1,016,000	40,962,715
Net loss		(22,109)					(22,109)
Stock-based compensation expense		2,704				2,704
Issued pursuant to exercise of stock options		111			$ 1,017	(906)
Issued pursuant to exercise of of stock options (in Shares)					154,853
Balance at Jun. 30, 2021		256,983		$ 7,732	$ 499,351	67,255	(316,365)	(990)
Balance (in Shares) at Jun. 30, 2021				1,016,000	41,117,568
Net loss		(15,445)					(15,445)
Issuance of common shares, net of issuance costs (note 9a)		4,730			$ 4,730
Issuance of common shares, net of issuance costs (note 9a) (in shares)					275,337
Stock-based compensation expense		2,643				2,643
Issued pursuant to exercise of stock options		$ 28			$ 305	(277)
Issued pursuant to exercise of of stock options (in Shares)		41,974	[2]		19,970
Balance at Sep. 30, 2021		$ 248,939		$ 7,732	$ 504,386	$ 69,621	$ (331,810)	$ (990)
Balance (in Shares) at Sep. 30, 2021				1,016,000	41,412,875

[1] The accumulated other comprehensive loss is entirely related to historical cumulative translation adjustments from the application of U.S. dollar reporting when the functional currency of the Company was the Canadian dollar.

[2] During the nine months ended September 30, 2021, 61,072 stock options were exercised for the same number of common shares in exchange for cash (nine months ended September 30, 2020 – 10,715). In the same period, the Company issued 196,206 common shares (nine months ended September 30, 2020 – 85,816) for the cashless exercise of 325,636 stock options (nine months ended September 30, 2020 – 142,702).