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Common Stock and Warrants - Summary of Warrant Activity (Detail)
 3 Months Ended
Mar. 31, 2018
$ / shares
shares
Mar. 31, 2018
$ / shares
shares
Class Of Warrant Or Right [Line Items]    
Number of Warrants, Outstanding, ending balance 1,798,941 1,798,941
CAD    
Class Of Warrant Or Right [Line Items]    
Number of Warrants, Outstanding, beginning balance 1,011,505 1,011,505
Number of Warrants, Granted 206 206
Number of Warrants, Exercised (618) (618)
Number of Warrants, Outstanding, ending balance 1,011,093 1,011,093
Weighted-Average Exercise Price, Outstanding, beginning balance | $ / shares   $ 7.38
Weighted-Average Exercise Price, Granted | $ / shares   7.50
Weighted-Average Exercise Price, Exercised | $ / shares   5.83
Weighted-Average Exercise Price, Outstanding, ending balance | $ / shares   $ 7.38
USD    
Class Of Warrant Or Right [Line Items]    
Number of Warrants, Outstanding, beginning balance 1,343,404 1,343,404
Number of Warrants, Exercised (555,556) (555,556)
Number of Warrants, Outstanding, ending balance 787,848 787,848
Weighted-Average Exercise Price, Outstanding, beginning balance | $ / shares $ 10.25  
Weighted-Average Exercise Price, Exercised | $ / shares 6.75  
Weighted-Average Exercise Price, Outstanding, ending balance | $ / shares $ 12.72