Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Segment Information
Exploration	$ 110	$ 1,657
General and administrative	25,468	21,447
Amortization	180	89
Legal settlement loss	(7,900)
Arrangement fees		195
Interest expense	433	185
Equity income in affiliates	(45,230)	(42,804)
Impairment of investment in affiliates		80,348
Income tax expense	1,565	0
Net other (income) loss	(4,955)	4,738
Total Assets	383,501	345,248
Continuing Operations
Segment Information
Exploration	110	1,657
General and administrative	25,468	21,447
Amortization	180	89
Legal settlement loss	7,900
Arrangement fees		195
Interest expense	433	185
Equity income in affiliates	(45,230)	(42,804)
Impairment of investment in affiliates		80,348
Income tax expense	1,565
Net other (income) loss	(4,955)	4,738
Total Assets	383,501	345,248
Mexico. | Continuing Operations
Segment Information
Exploration	83	1,657
General and administrative	1,124	1,424
Amortization	5
Equity income in affiliates	(45,230)	(42,804)
Income tax expense	1,565
Net other (income) loss	22	40
Total Assets	109,081	84,277
Corporate | Continuing Operations
Segment Information
Exploration	27
General and administrative	24,344	20,023
Amortization	175	89
Legal settlement loss	7,900
Arrangement fees		195
Interest expense	433	185
Impairment of investment in affiliates		80,348
Net other (income) loss	(4,977)	4,698
Total Assets	$ 274,420	$ 260,971