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Share Capital (Narrative) (Details)
 1 Months Ended 12 Months Ended
Feb. 28, 2017
USD ($)
shares / $
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
May 29, 2017
$ / shares
Disclosure of classes of share capital [line items]        
Issue of equity   $ 74,804,000 $ 122,813,000  
Number of shares that remain available under the plan for issuance | shares   2,222,905    
Expense from share-based payment transactions with employees   $ 3,841,000 14,138,000  
Stock Options Clase of Share Capital [member]        
Disclosure of classes of share capital [line items]        
Issuance of common shares, shares | shares 11,873,750      
Shares issed for the period per share amount | shares / $ 6.30      
Proceeds from issuing shares, gross $ 74,804,000      
Proceeds from issuing shares $ 70,497,000      
Number of shares authorised | shares   12,200,000    
Granted, options | shares   617,694    
Risk free interest rate, share options granted   0.77%    
Expected volatility, share options granted   63.02%    
Option life, share options granted   3    
Description of expected forfeiture rate   5.57    
Expected dividend, share options granted   $ 0    
Description of option pricing model, share options granted   Black-Scholes model    
Fair value per share granted options | $ / shares       $ 2.61
Expense from share-based payment transactions with employees   $ 674,000 $ 468,000