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Common Stock and Warrants - Summary of Warrant Activity (Details)
 12 Months Ended
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
Class Of Warrant Or Right [Line Items]            
Number of Warrants, Exercised (70,900) (70,900)        
Number of Warrants, Outstanding 4,004,304 4,004,304 4,004,304 4,004,304    
CAD            
Class Of Warrant Or Right [Line Items]            
Number of Warrants, Outstanding     1,011,505 1,011,505 1,111,530 1,111,530
Number of Warrants, Granted     2,476,843 2,476,843 25,063 25,063
Number of Warrants, Expired     (22,699) (22,699)    
Number of Warrants, Exercised     (112,665) (112,665) (125,088) (125,088)
Number of Warrants, Outstanding         1,011,505 1,011,505
Number of Warrants, Outstanding and exercisable 3,352,984 3,352,984 3,352,984 3,352,984    
Weighted-Average Exercise Price, Outstanding | $ / shares       $ 7.38   $ 7.30
Weighted-Average Exercise Price, Granted | $ / shares       12.22   7.50
Weighted-Average Exercise Price, Expired | $ / shares       5.00    
Weighted-Average Exercise Price, Exercised | $ / shares       9.88   6.50
Weighted-Average Exercise Price, Outstanding | $ / shares           $ 7.38
Weighted-Average Exercise Price, Outstanding and exercisable | $ / shares   $ 10.89   $ 10.89    
USD            
Class Of Warrant Or Right [Line Items]            
Number of Warrants, Outstanding     1,343,404 1,343,404 905,721 905,721
Number of Warrants, Granted         646,016 646,016
Number of Warrants, Expired     (136,528) (136,528)    
Number of Warrants, Exercised     (555,556) (555,556) (208,333) (208,333)
Number of Warrants, Outstanding         1,343,404 1,343,404
Number of Warrants, Outstanding and exercisable 651,320 651,320 651,320 651,320    
Weighted-Average Exercise Price, Outstanding | $ / shares     $ 10.25   $ 8.10  
Weighted-Average Exercise Price, Granted | $ / shares         12.25  
Weighted-Average Exercise Price, Expired | $ / shares     15.00      
Weighted-Average Exercise Price, Exercised | $ / shares     6.75   7.20  
Weighted-Average Exercise Price, Outstanding | $ / shares         $ 10.25  
Weighted-Average Exercise Price, Outstanding and exercisable | $ / shares $ 12.24   $ 12.24