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Equity - Warrants (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Warrant outstanding, beginning balance (in shares) | 785,063 | 1,797,563
Warrants exercised (in shares) | (747,563) | (1,012,500)
Warrants expired (in shares) | (37,500) |
Warrant outstanding, ending balance (in shares) | 0 | 785,063
Exercise price of $1.50 |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Exercise price (usd per share) | $ 1.50 |
Warrant outstanding, beginning balance (in shares) | 122,563 | 122,563
Warrants exercised (in shares) | (122,563) | 0
Warrants expired (in shares) | 0 |
Warrant outstanding, ending balance (in shares) | 0 | 122,563
Exercise price of $2.00 |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Exercise price (usd per share) | $ 2.00 |
Warrant outstanding, beginning balance (in shares) | 662,500 | 1,675,000
Warrants exercised (in shares) | (625,000) | (1,012,500)
Warrants expired (in shares) | (37,500) |
Warrant outstanding, ending balance (in shares) | 0 | 662,500

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