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Share Capital and Share Premium (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 10 Months Ended 12 Months Ended
Jan. 31, 2018
Feb. 10, 2017
Feb. 08, 2017
Oct. 19, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of classes of share capital [line items]              
Share premium         $ 140,334 $ 139,684 $ 110,013
Proceeds from issuance of share capital         $ 600 9,653 0
Warrants expense           218  
Voting rights         Holders of the Company’s common shares and Class B shares have equivalent economic rights, but holders of Company’s common shares are entitled to one vote per share and holders of the Company’s Class B shares are entitled to twenty votes per share.    
Borrowings         $ 36,868 41,538  
Repayments of debt         19,497 4,399 3,100
Issuance of common stock due to exercise of warrants         $ 600 2,371  
Firment Trading Limited              
Disclosure of classes of share capital [line items]              
Shares issued during period     1,688,500        
Warrants exercise price     $ 16        
Number of shares called by warrants     623,058        
Borrowings     $ 18,524        
Credit Facility, Decrease, Forgiveness     $ 16,885        
Repayments of debt   $ 1,639          
Silaner Investments Limited              
Disclosure of classes of share capital [line items]              
Shares issued during period     311,500        
Warrants exercise price     $ 16        
Number of shares called by warrants     114,944        
Credit Facility, Decrease, Forgiveness     $ 3,115        
Repayments of debt           $ 280 $ 74
February 2017 Private Placement              
Disclosure of classes of share capital [line items]              
Number of warrants exercised 37,500            
Proceeds from warrant exercises $ 600            
Proceeds from issuance of share capital     $ 5,000        
Shares issued during period     500,000        
Par value per share     $ 0.004        
Warrants exercise price     $ 16        
Number of outstanding warrants         3,052,321 3,089,821  
Number of shares called by warrants     2,500,000   3,052,321 3,089,821  
Issuance of common stock due to exercise of warrants           148,181  
Issuance of common stock due to exercise of warrants           $ 2,371  
October 2017 Private Placement              
Disclosure of classes of share capital [line items]              
Proceeds from issuance of share capital       $ 2,500      
Shares issued during period       250,000      
Par value per share       $ 0.004      
Maximum proportion of owneship interest by a warrant holder after warrants exercises       4.99%      
Warrants exercise price       $ 16      
Number of outstanding warrants         1,250,000 1,250,000  
Number of shares called by warrants       1,250,000 1,250,000 1,250,000  
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%      
Class B common shares              
Disclosure of classes of share capital [line items]              
Number of shares outstanding         0 0 0
Series A Preferred Shares              
Disclosure of classes of share capital [line items]              
Number of shares outstanding         0 0 0