CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 3,250	$ 2,588
Short-term investments	238	334
Lease receivables	314	380
Inventories, net	242	245
Value added tax receivable, net	148	5
Related party receivable		643
Prepaid expenses and other assets	745	578
Total current assets	4,937	4,773
Property, plant and equipment, net	8,140	9,235
Total assets	13,077	14,008
Current liabilities
Accounts payable and other accrued liabilities	1,556	1,224
Deferred revenue, current	293
Other current liabilities	9	24
Total current liabilities	1,858	1,248
Asset retirement and reclamation liabilities	2,495	2,434
Deferred Revenue, non-current	600
Warrant liability - related party		976
Warrant liability		922
Other long term liabilities	43	66
Total liabilities	4,996	5,646
Commitments and contingencies
Equity
Common stock, $.01 par value, 200,000,000 shares authorized; 91,929,709 and 89,020,041 shares issued and outstanding, respectively	919	889
Additional paid in capital	516,284	495,455
Accumulated deficit	(509,082)	(488,037)
Accumulated other comprehensive (loss) income	(40)	55
Shareholders' equity	8,081	8,362
Total liabilities and equity	$ 13,077	$ 14,008