Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 7,200	$ 3,309
Marketable securities	1,060
Notes receivable - current	1,500
Prepaid and other current assets	831	602
Total Current Assets	10,591	3,911
Property, plant and equipment, at cost:
Property, plant and equipment	112,560	112,964
Less accumulated depreciation, depletion and impairment	(65,677)	(66,048)
Net property, plant and equipment	46,883	46,916
Restricted cash	3,668	3,964
Notes receivable - non-current	2,554
Long-term assets held for sale		2,123
Total Assets	63,696	56,914
Current Liabilities:
Accounts payable	860	610
Accrued liabilities	1,450	1,981
Convertible loan, net of discount - related party		5,431
Current portion of asset retirement obligations	121	121
Total Current Liabilities	2,431	8,143
Asset retirement obligations, net of current portion	5,025	4,668
Other long-term liabilities and deferred credits	500	500
Long-term liabilities related to assets held for sale		555
Total Liabilities	7,956	13,866
Commitments and Contingencies
Stockholders' Equity:
Common stock, 100,000,000 shares authorized, $.001 par value; Issued shares - 27,484,935 and 16,675,419, respectively Outstanding shares - 27,476,910 and 16,667,394, respectively	28	17
Paid-in capital	296,937	280,191
Accumulated other comprehensive income	(287)
Accumulated deficit	(240,680)	(236,902)
Treasury stock (8,025 and 8,025 shares, respectively), at cost	(258)	(258)
Total Stockholders' Equity	55,740	43,048
Total Liabilities and Stockholders' Equity	$ 63,696	$ 56,914

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).