Accounts Payable and Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts payable and accruals	$ 488	$ 310
Accrued employee compensation and benefits	1,164	1,246
Accounts payable and other accrued liabilities	1,652	1,556
Accrued vacation	200	200
Withholding taxes and benefits payable	400	600
KELTIP
Withholding taxes and benefits payable	600
Velardena properties
Accounts payable and accruals	100	100
Withholding taxes and benefits payable	400	300
VAT payable, net		100
Corporate, Exploration & Other
Accounts payable and accruals	$ 400	200
Withholding taxes and benefits payable		$ 400