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Share Capital and Share Premium (Details) - USD ($)
$ in Thousands
 1 Months Ended 6 Months Ended 10 Months Ended
Feb. 08, 2017
Jun. 30, 2018
Jun. 30, 2017
Oct. 19, 2017
Dec. 31, 2017
Disclosure of classes of share capital [line items]          
Share premium   $ 140,199     $ 139,571
Proceeds from issuance of share capital   $ 600 $ 5,011    
February 2017 Private Placement          
Disclosure of classes of share capital [line items]          
Number of warrants exercised   375,000      
Proceeds from warrant exercises   $ 600      
Maximum proportion of owneship interest by a warrant holder after warrants exercises 4.99%        
Number of outstanding warrants   30,523,209      
Number of shares called by warrants   30,523,209      
February 2017 Private Placement | Maximum          
Disclosure of classes of share capital [line items]          
Maximum proportion of owneship interest by a warrant holder after warrants exercises 9.99%        
October 2017 Private Placement          
Disclosure of classes of share capital [line items]          
Maximum proportion of owneship interest by a warrant holder after warrants exercises       4.99%  
Number of outstanding warrants   12,500,000      
Number of shares called by warrants   12,500,000   12,500,000  
October 2017 Private Placement | Maximum          
Disclosure of classes of share capital [line items]          
Maximum proportion of owneship interest by a warrant holder after warrants exercises       9.99%