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Other Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Other Current Liabilities    
Other long-term liabilities (Note 13) $ 418 $ 33
Sale of Equipment    
Other Current Liabilities    
Deferred liability 1,500  
Sale of Equipment | Zacatecas    
Other Current Liabilities    
Lease liability for office space 100  
Insurance premium payable $ 100