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Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued Expenses and Other Current Liabilities    
Accrued insurance $ 216 $ 452
Accrued royalty payments 2,316 2,212
Dividends payable 227 219
IVA taxes payable, net 514  
Other payables 290 483
Total $ 3,563 $ 3,366