Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (798)	$ (16,820)	$ (10,974)	$ (24,101)	$ (25,383)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization and depreciation	346	1,209	1,317	3,743
Accretion of asset retirement obligation			143	148
Foreign currency gain on loss contingency				(106)
Impairment of long lived assets		13,181		13,181
Asset write off			24	2
Write off of loss contingency, net			(212)	(1,577)
Gain on sale of assets, net			(1,522)	(367)
Amortization of deferred loan costs			57
Warrant liability fair market adjustment	$ 545	$ (200)	2,821	(1,068)
Derivative liability fair market adjustment			778
Accretion of loan discount			372
Loss on debt extinguishment			1,653
Deferred income taxes			(26)
Stock compensation			666	372
Changes in operating assets and liabilities:
Decrease (Increase) in trade accounts receivable			41	(67)
Decrease in prepaid expenses and other assets			150	461
Decrease in inventories			66	393
Decrease in value added tax receivable, net			347	733
Increase in accrued interest payable net of amounts capitalized			86
(Decrease) in deferred revenue			(500)
(Decrease) in reclamation liability			(8)	(9)
(Decrease) increase in accounts payable and accrued liabilities			(389)	240
Decrease in deferred leasehold payments			(13)	(8)
Net cash used in operating activities			$ (5,123)	$ (8,030)