Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (1,135)	$ (6,287)	$ (10,659)
Adjustments to reconcile net loss to net cash used in operating activities:
Amortization and depreciation	188	550
Accretion of asset retirement obligation	49	51
Asset write off		18
Gain on reduction of asset retirement obligation	(56)
Gain on sale of assets	(115)	(45)
Amortization of deferred loan costs		44
Warrant liability fair market adjustment	62	1,180
Derivative liability fair market adjustment		648
Accretion of loan discount		326
Loss on debt extinguishment		1,666
Stock compensation	65	32
Changes in operating assets and liabilities:
Increase (decrease) in trade accounts receivable	(193)	16
Decrease in prepaid expenses and other assets	137
Increase in inventories	(24)	(1)
Increase (decrease) in value added tax recoverable, net	(6)	197
Increase in accrued interest payable net of amounts capitalized		66
Decrease in deferred revenue		(362)
Increase in reclamation liability	2
Decrease in accounts payable and accrued liabilities	(56)	(114)
Decrease in deferred leasehold payments	(5)	(3)
Net cash used in operating activities	$ (1,087)	$ (2,018)