Accounts Payable and Other Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts Payable and Other Accrued Liabilities
Accounts payable and accruals	$ 705	$ 599
Accrued employee compensation and benefits	507	545
Accounts payable and other accrued liabilities	1,212	1,144
Accrued vacation	100	100
Withholding taxes and benefits payable	400	400
Velardena properties
Accounts Payable and Other Accrued Liabilities
Accounts payable and accruals	500	300
Withholding taxes and benefits payable	200	200
Corporate, Exploration & Other
Accounts Payable and Other Accrued Liabilities
Accounts payable and accruals	$ 200	$ 300