CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Current assets
Cash and cash equivalents (Note 5)		$ 2,435	$ 3,766
Short-term investments			11
Accounts receivables		388	51
Value added tax receivable, net (Note 7)		1,132	3,135
Prepaid expenses and other assets (Note 6)		879	921
Current assets held for sale (Note 3)		497	830
Total current assets		5,331	8,714
Property, plant and equipment, net (Note 8)		2,758	2,789
Investments		265	265
Right-of-use assets		86	110
Assets held for sale (Note 3)		2,915	3,032
Total assets		11,355	14,910
Current liabilities
Accounts payable and other accrued liabilities (Note 9)		6,039	4,899
Other current liabilities (Note 11)		505	774
Total current liabilities		6,544	5,673
Asset retirement and reclamation liabilities (Note 10)		306	306
Other long-term liabilities (Note 11)		19	28
Liabilities held for sale (Note 3)		3,865	3,790
Total liabilities		10,734	9,797
Commitments and contingencies (Note 16)
Equity (Note 14)
Common stock, $.01 par value, 28,000,000 shares authorized; 14,572,185 and 14,084,680 shares issued and outstanding, respectively (1)	[1]	146	141
Additional paid-in capital		552,228	552,160
Accumulated deficit		(551,753)	(547,188)
Shareholders' equity		621	5,113
Total liabilities and equity		$ 11,355	$ 14,910

[1] Reflects the one-for-25 reverse stock split that became effective June 9, 2023. Refer to Note 1, Basis of Preparation of Financial Statements and Nature of Operations.