CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 2,510	$ 3,250
Short-term investments	343	238
Lease receivables	435	314
Inventories, net	239	242
Value added tax receivable, net	13	148
Prepaid expenses and other assets	1,019	745
Total current assets	4,559	4,937
Property, plant and equipment, net	7,632	8,140
Total assets	12,191	13,077
Current liabilities
Accounts payable and other accrued liabilities	1,652	1,556
Deferred revenue, current	293	293
Other current liabilities	197	9
Total current liabilities	2,142	1,858
Asset retirement and reclamation liabilities	2,582	2,495
Deferred revenue, non-current	454	600
Other long term liabilities	27	43
Total liabilities	5,205	4,996
Commitments and contingencies
Equity
Common stock, $.01 par value, 200,000,000 shares authorized; 95,520,796 and 91,929,709 shares issued and outstanding respectively	955	919
Additional paid in capital	517,635	516,284
Accumulated deficit	(511,604)	(509,082)
Accumulated other comprehensive loss		(40)
Shareholders' equity	6,986	8,081
Total liabilities and equity	$ 12,191	$ 13,077

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.