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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, 2019
Dec. 31, 2018
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    
Offers or sales of common shares   $ 0 $ 0