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Common Stock and Warrants - Summary of Warrant Activity (Details) |  | 12 Months Ended
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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 |  |  |

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