CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents (Note 3)	$ 6,866	$ 9,704
Short-term investments (Note 3)	117	79
Lease receivables		72
Inventories, net (Note 5)	2,003	284
Value added tax receivable, net	1,600	45
Prepaid expenses and other assets (Note 4)	1,090	1,130
Total current assets	11,676	11,314
Property, plant and equipment, net (Note 7)	6,508	5,520
Other long term assets (Note 8)	921	1,472
Total assets	19,105	18,306
Current liabilities
Accounts payable and other accrued liabilities (Note 9)	2,669	1,318
Deferred revenue, current (Note 17)	256	535
Other current liabilities (Note 11)	389	667
Total current liabilities	3,314	2,520
Asset retirement and reclamation liabilities (Note 12)	3,209	3,166
Other long term liabilities (Note 11)	467	648
Total liabilities	6,990	6,334
Commitments and contingencies (Note 20)
Equity (Note 15)
Common stock, $.01 par value, 350,000,000 shares authorized; 162,804,612 and 157,512,652 shares issued and outstanding respectively	1,628	1,575
Additional paid in capital	540,341	536,263
Accumulated deficit	(529,854)	(525,866)
Shareholders' equity	12,115	11,972
Total liabilities and equity	$ 19,105	$ 18,306