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, 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	(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)	22,402	[2]		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
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)	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

[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 three months ended March 31, 2020, 1,972 stock options were exercised for the same number of common shares for cash (2019 – 20,576). In the same period, the Company issued 55,885 common shares (2019 – 657) for the cashless exercise of 96,354 stock options (2019 – 1,826).