CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 3,932	$ 4,077
Short-term investments	269	72
Trade receivables	658	546
Inventories	290	330
Value added tax receivable, net	4	400
Prepaid expenses and other assets	448	451
Total current assets	5,601	5,876
Property, plant and equipment, net	9,842	11,125
Total assets	15,443	17,001
Current liabilities
Accounts payable and other accrued liabilities	1,538	1,144
Convertible note payable-related party, net		3,702
Derivative liability-related party		488
Deferred revenue		500
Other current liabilities	229	556
Total current liabilities	1,767	6,390
Asset retirement obligation	2,342	2,546
Warrant liability	2,486	210
Other long term liabilities	76	84
Total liabilities	6,671	9,230
Equity
Common stock, $.01 par value, 200,000,000 and 100,000,000 shares authorized; 88,920,041 and 53,335,333 shares issued and outstanding, respectively	889	534
Additional paid in capital	495,393	484,742
Accumulated deficit	(487,554)	(477,378)
Accumulated other comprehensive income loss	44	(127)
Shareholders' equity	8,772	7,771
Total liabilities and equity	$ 15,443	$ 17,001