Common Shares - ATM Agreement (Details) - At-The-Market Offering Agreement [Member] - H. C. Wainwright And Co., LLC [Member] - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Nov. 30, 2017	Dec. 31, 2018	Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]
Threshold of aggregate sales proceeds	$ 10,000
Offers or sales of common shares under Agreement to be made in Canada	$ 0
Commission rate (as a percent)	2.00%
Reimbursement of certain legal expenses	$ 50
Additional accounting, legal and regulatory costs incurred	$ 156
Offers or sales of common shares		$ 0	$ 0