Accounts Payable and Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts payable and accruals	$ 273	$ 344
Accrued employee compensation and benefits	1,075	880
Accounts payable and other accrued liabilities	1,348	1,224
Accrued vacation	300	300
Withholding taxes and benefits payable	800	600
KELTIP
Withholding taxes and benefits payable	500
Velardena properties
Accounts payable and accruals	100	100
Withholding taxes and benefits payable	300	200
VAT payable, net		100
Corporate, Exploration & Other
Accounts payable and accruals	200	200
Withholding taxes and benefits payable		$ 300
Maximum | Velardena properties
VAT payable, net	$ 100