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)	98,326	[2]		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, 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 warrants, 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)	122,403	[2]		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

[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 three months ended March 31, 2021, 46,296 (2020 – 1,972) stock options were exercised for the same number of common shares in exchange for cash. In the same period, the Company issued 36,159 (2020 – 55,885) common shares for the cashless exercise of 76,107 (2020 – 96,354) stock options.