CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenue		$ 11,857	$ 13,227	$ 31,853	$ 26,628
Costs of sales		13,489	12,601	33,351	25,311
Gross profit (loss)		(1,632)	626	(1,498)	1,317
Operating expenses:
Exploration costs		0	9	0	62
Selling, general and administrative expenses		6,425	9,016	13,196	17,110
Total operating expenses		6,425	9,025	13,196	17,172
Loss from equity method investments		(1,139)	(4,910)	(6,074)	(10,350)
Restructuring charges		(401)	(314)	(684)	(2,094)
Loss from operations		(9,597)	(13,623)	(21,452)	(28,299)
Other (expense) income:
Interest income		537	653	1,236	1,480
Interest expense		(532)	(76)	(1,092)	(298)
Loss on sale of equity method investments	[1]	0	0	0	(13,886)
Other (loss) income		(146)	(288)	(4,061)	965
Total other (expense) income		(141)	289	(3,917)	(11,739)
Loss before income taxes		(9,738)	(13,334)	(25,369)	(40,038)
Income tax benefit		0	(2)	0	(3,095)
Net loss		$ (9,738)	$ (13,332)	$ (25,369)	$ (36,943)
Basic and diluted:
Basic net loss per weighted-average share (in dollars per share)		$ (0.44)	$ (0.69)	$ (1.16)	$ (1.91)
Diluted net loss per weighted-average share (in dollars per share)		$ (0.44)	$ (0.69)	$ (1.16)	$ (1.91)
Weighted-average shares outstanding:
Basic (in shares)		21,945	19,370	21,942	19,348
Diluted (in shares)		21,945	19,370	21,942	19,348

[1] Loss on sale of equity method investments includes a loss on the sale of shares in Sayona Mining of $17,215, partially offset by a gain on the sale of shares in Atlantic Lithium of $3,143 and a gain on dilution related to the issuance of additional shares of Atlantic Lithium of $186 for the six months ended June 30, 2024. See Note 8—Equity Method Investments.