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Equity - Warrants (Details) - $ / shares
 12 Months Ended
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