CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 2,109	$ 4,077
Short-term investments	154	72
Trade receivables	530	546
Inventories	331	330
Value added tax receivable, net	203	400
Prepaid expenses and other assets	450	451
Total current assets	3,777	5,876
Property, plant and equipment, net	10,254	11,125
Total assets	14,031	17,001
Current liabilities
Accounts payable and other accrued liabilities	1,212	1,144
Convertible note payable, net	963	3,702
Derivative liability	687	488
Deferred revenue	138	500
Other current liabilities	295	556
Total current liabilities	3,295	6,390
Asset retirement obligation	2,297	2,546
Warrant liability	1,390	210
Other long term liabilities	80	84
Total liabilities	7,062	9,230
Equity
Common stock, $.01 par value, 100,000,000 shares authorized; 76,690,333 and 53,335,333 shares issued and outstanding, respectively	767	534
Additional paid in capital	489,912	484,742
Accumulated deficit	(483,665)	(477,378)
Accumulated other comprehensive income loss	(45)	(127)
Shareholders' equity	6,969	7,771
Total liabilities and equity	$ 14,031	$ 17,001

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.