Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands		Total		Cumulative Effect, Period of Adoption, Adjustment	Convertible Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member] Cumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss [Member]	[1]
Balance at Dec. 31, 2018		$ 103,295			$ 7,732	$ 265,923	$ 38,515	$ (207,885)		$ (990)
Balance (in Shares) at Dec. 31, 2018					1,016,000	25,750,721
Cumulative effect of accounting change at Mar. 31, 2019				$ (175)					$ (175)
Net loss		(11,341)						(11,341)
Stock-based compensation expense		476					476
Issued pursuant to exercise of stock options		58				$ 117	(59)
Issued pursuant to exercise of of stock options (in Shares)						21,233
Balance at Mar. 31, 2019		92,313			$ 7,732	$ 266,040	38,932	(219,401)		(990)
Balance (in Shares) at Mar. 31, 2019					1,016,000	25,771,954
Balance at Dec. 31, 2018		103,295			$ 7,732	$ 265,923	38,515	(207,885)		(990)
Balance (in Shares) at Dec. 31, 2018					1,016,000	25,750,721
Net loss		$ (30,219)
Issued pursuant to exercise of of stock options (in Shares)	[2]	174,811
Balance at Sep. 30, 2019		$ 74,564			$ 7,732	$ 266,425	39,676	(238,279)		(990)
Balance (in Shares) at Sep. 30, 2019					1,016,000	25,868,594
Balance at Dec. 31, 2018		103,295			$ 7,732	$ 265,923	38,515	(207,885)		(990)
Balance (in Shares) at Dec. 31, 2018					1,016,000	25,750,721
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
Balance at Mar. 31, 2019		92,313			$ 7,732	$ 266,040	38,932	(219,401)		(990)
Balance (in Shares) at Mar. 31, 2019					1,016,000	25,771,954
Net loss		(10,007)						(10,007)
Stock-based compensation expense		470					470
Issued pursuant to exercise of stock options		11				$ 22	(11)
Issued pursuant to exercise of of stock options (in Shares)						3,102
Balance at Jun. 30, 2019		82,787			$ 7,732	$ 266,062	39,391	(229,408)		(990)
Balance (in Shares) at Jun. 30, 2019					1,016,000	25,775,056
Net loss		(8,871)						(8,871)
Stock-based compensation expense		630					630
Issued pursuant to exercise of stock options		$ 18				$ 363	(345)
Issued pursuant to exercise of of stock options (in Shares)		148,948	[2]			93,538
Balance at Sep. 30, 2019		$ 74,564			$ 7,732	$ 266,425	39,676	(238,279)		(990)
Balance (in Shares) at Sep. 30, 2019					1,016,000	25,868,594
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 10a)		102,456				$ 102,456
Issuance of common shares, net of issuance costs (note 10a) (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

[1] Our 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, 2020, 10,715 stock options were exercised for the same number of common shares for cash (nine months ended September 30, 2019 – 23,625). In the same period, the Company issued 85,816 common shares (nine months ended September 30, 2019 – 94,248) for the cashless exercise of 142,702 stock options (nine months ended September 30, 2019 – 151,186).