Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss			$ (1,170)	$ (10,176)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization and depreciation	$ 130	$ 421	318	971
Accretion of asset retirement obligation			97	97
Asset write off				34
Gain on reduction of asset retirement obligation			(56)
Gain on sale of assets			(596)	(45)
Amortization of deferred loan costs				57
Warrant liability fair market adjustment	$ (425)	1,096	(363)	2,276
Derivative liability fair market adjustment		130		778
Accretion of loan discount				372
Loss on debt extinguishment		$ (13)		1,653
Deferred income taxes				(26)
Stock compensation			307	571
Changes in operating assets and liabilities:
Decrease (increase) in trade accounts receivable			525	(112)
(Increase) decrease in prepaid expenses and other assets			(47)	3
(Increase) decrease in inventories			(36)	40
Increase (decrease) in value added tax recoverable, net			(187)	347
Increase in accrued interest payable net of amounts capitalized				85
Decrease in deferred revenue				(500)
Decrease in reclamation liability			(3)	(8)
Decrease in accounts payable and accrued liabilities			(47)	(183)
Decrease in deferred leasehold payments			(11)	(8)
Net cash used in operating activities			$ (1,269)	$ (3,774)