CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents (Note 4)	$ 11,730	$ 12,229
Short-term investments (Note 4)	91	67
Inventories, net (Note 6)	1,963	1,608
Value added tax receivable, net (Note 7)	1,475	1,290
Prepaid expenses and other assets (Note 5)	1,122	1,145
Total current assets	16,381	16,339
Property, plant and equipment, net (Note 8)	6,563	6,627
Other long-term assets (Note 9)	693	747
Total assets	23,637	23,713
Current liabilities
Accounts payable and other accrued liabilities (Note 10)	4,337	3,509
Deferred revenue (Note 8)	1,094	1,469
Other current liabilities (Note 11)	625	721
Total current liabilities	6,056	5,699
Asset retirement and reclamation liabilities (Note 12)	3,639	3,569
Other long-term liabilities (Note 11)	246	353
Total liabilities	9,941	9,621
Commitments and contingencies (Note 19)
Equity (Note 15)
Common stock, $.01 par value, 350,000,000 shares authorized; 163,927,992 and 162,804,612 shares issued and outstanding respectively	1,639	1,628
Additional paid in capital	540,427	540,518
Accumulated deficit	(528,370)	(528,054)
Shareholders' equity	13,696	14,092
Total liabilities and equity	$ 23,637	$ 23,713

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Value received from shareholders in common stock-related transactions that are in excess of par value or stated value and amounts received from other stock-related transactions. Includes only common stock transactions (excludes preferred stock transactions). May be called contributed capital, capital in excess of par, capital surplus, or paid-in capital.