CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 2,237	$ 3,293
Short-term investments	225	330
Lease receivables	490	481
Inventories, net	231	229
Value added tax receivable, net	12	14
Prepaid expenses and other assets	1,249	1,188
Total current assets	4,444	5,535
Property, plant and equipment, net	6,844	7,109
Total assets	11,288	12,644
Current liabilities
Accounts payable and other accrued liabilities	1,493	1,702
Deferred revenue, current	293	293
Other current liabilities	50	12
Total current liabilities	1,836	2,007
Asset retirement and reclamation liabilities	2,675	2,683
Deferred revenue, non-current	234	307
Other long term liabilities		10
Total liabilities	4,745	5,007
Commitments and contingencies
Equity
Common stock, $.01 par value, 200,000,000 shares authorized; 96,868,433 and 95,620,796 shares issued and outstanding respectively	968	955
Additional paid in capital	519,050	517,806
Accumulated deficit	(513,475)	(511,124)
Shareholders' equity	6,543	7,637
Total liabilities and equity	$ 11,288	$ 12,644

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.

Name:	us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
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.