CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 2,892	$ 3,293
Short-term investments		330
Lease receivables	460	481
Inventories, net	227	229
Value added tax receivable, net	11	14
Prepaid expenses and other assets	374	619
Total current assets	3,964	4,966
Property, plant and equipment, net	6,304	7,109
Other long term assets	965	569
Total assets	11,233	12,644
Current liabilities
Accounts payable and other accrued liabilities	1,665	1,969
Deferred revenue, current	293	293
Other current liabilities	1,649	12
Total current liabilities	3,607	2,274
Asset retirement and reclamation liabilities	2,782	2,683
Deferred revenue, non-current	88	307
Other long term liabilities	384	10
Total liabilities	6,861	5,274
Commitments and contingencies
Equity
Common stock, $.01 par value, 200,000,000 shares authorized; 106,734,279 and 95,620,796 shares issued and outstanding respectively	1,067	955
Additional paid in capital	521,268	517,806
Accumulated deficit	(517,963)	(511,391)
Shareholders' equity	4,372	7,370
Total liabilities and equity	$ 11,233	$ 12,644