CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents (Note 3)	$ 7,975	$ 9,704
Short-term investments (Note 3)	131	79
Lease receivables		72
Inventories, net (Note 5)	1,840	284
Value added tax receivable, net	805	45
Prepaid expenses and other assets (Note 4)	990	1,130
Total current assets	11,741	11,314
Property, plant and equipment, net (Note 7)	6,106	5,520
Other long term assets (Note 8)	978	1,472
Total assets	18,825	18,306
Current liabilities
Accounts payable and other accrued liabilities (Note 9)	2,290	1,318
Deferred revenue, current (Note 17)	396	535
Other current liabilities (Note 11)	544	667
Total current liabilities	3,230	2,520
Asset retirement and reclamation liabilities (Note 12)	3,145	3,166
Other long term liabilities (Note 11)	512	648
Total liabilities	6,887	6,334
Commitments and contingencies (Note 20)
Equity (Note 15)
Common stock, $.01 par value, 200,000,000 shares authorized; 162,469,612 and 157,512,652 shares issued and outstanding respectively	1,625	1,575
Additional paid in capital	539,357	536,263
Accumulated deficit	(529,044)	(525,866)
Shareholders' equity	11,938	11,972
Total liabilities and equity	$ 18,825	$ 18,306