CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 4,593	$ 3,293
Short-term investments		330
Lease receivables	448	481
Inventories, net	231	229
Derivative at fair value	254
Prepaid expenses and other assets	669	633
Total current assets	6,195	4,966
Property, plant and equipment, net	6,031	7,109
Other long term assets	1,131	569
Total assets	13,357	12,644
Current liabilities
Accounts payable and other accrued liabilities	2,127	1,969
Deferred revenue, current	472	293
Other current liabilities	1,824	12
Total current liabilities	4,423	2,274
Asset retirement and reclamation liabilities	2,839	2,683
Deferred revenue, non-current		307
Other long term liabilities	494	10
Total liabilities	7,756	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	521,314	517,806
Accumulated deficit	(516,780)	(511,391)
Shareholders' equity	5,601	7,370
Total liabilities and equity	$ 13,357	$ 12,644