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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accrued Expenses and Other Current Liabilities    
Accrued insurance $ 88 $ 662
Accrued royalty payments 2,585 1,805
Dividends payable 96 95
IVA taxes payable, net   274
Other payables 249 15
Accrued expenses and other current liabilities $ 3,018 $ 2,851