Common Stock and Warrants - Summary of Warrant Activity (Details)			3 Months Ended
	Mar. 31, 2019 $ / shares shares	Mar. 31, 2019 $ / shares shares	Mar. 31, 2019 $ / shares shares	Mar. 31, 2019 $ / shares shares
Class Of Warrant Or Right [Line Items]
Number of Warrants, Exercised	(70,900)	(70,900)
Number of Warrants, Outstanding	3,987,984	3,987,984	3,987,984	3,987,984
CAD
Class Of Warrant Or Right [Line Items]
Number of Warrants, Outstanding			3,352,984	3,352,984
Number of Warrants, Exercised			(16,320)	(16,320)
Number of Warrants, Outstanding	3,336,664	3,336,664	3,336,664	3,336,664
Weighted Average Exercise Price, Outstanding | $ / shares				$ 10.89
Weighted Average Exercise Price, Exercised | $ / shares				7.50
Weighted Average Exercise Price, Outstanding | $ / shares		$ 10.91		$ 10.91
USD
Class Of Warrant Or Right [Line Items]
Number of Warrants, Outstanding			651,320	651,320
Number of Warrants, Outstanding	651,320	651,320	651,320	651,320
Weighted Average Exercise Price, Outstanding | $ / shares			$ 12.24
Weighted Average Exercise Price, Outstanding | $ / shares	$ 12.24		$ 12.24