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		$ (21,348)
Issued pursuant to exercise of of stock options (in Shares)	[2]	25,863
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
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)		3,461	[2]			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
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		$ (7,659)
Issued pursuant to exercise of of stock options (in Shares)	[2]	153,042
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
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)		54,716	[2]			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

[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 six months ended June 30, 2020, 10,715 stock options were exercised for the same number of common shares for cash (six months ended June 30, 2019 – 23,472). In the same period, the Company issued 85,660 common shares (six months ended June 30, 2019 – 863) for the cashless exercise of 142,327 stock options (six months ended June 30, 2019 – 2,391).