CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Product sales (including related party)	$ 98,581	$ 40,864	$ 230,842	$ 91,699
Other sales	1,173	158	2,001	433
Total revenue	99,754	41,022	232,843	92,132
Operating costs and expenses:
Cost of sales (including related party)(excluding depreciation, depletion and amortization)	21,907	15,425	57,798	44,957
General and administrative	14,881	5,635	40,986	14,477
Advanced projects, development and other	1,327	11	2,436	96
Depreciation, depletion and amortization	6,951	2,179	19,767	4,832
Accretion of asset retirement and environmental obligations	595	563	1,780	1,691
Royalty expense to SNR	0	1,055	0	1,908
Write-down of inventories	0	0	1,809	0
Settlement charge	0	0	0	66,615
Total operating costs and expenses	45,661	24,868	124,576	134,576
Operating income (loss)	54,093	16,154	108,267	(42,444)
Other income, net	97	61	3,656	298
Interest expense, net	(2,624)	(1,713)	(6,417)	(3,582)
Income (loss) before income taxes	51,566	14,502	105,506	(45,728)
Income tax benefit (expense)	(8,803)	125	(19,458)	(211)
Net income (loss)	$ 42,763	$ 14,627	$ 86,048	$ (45,939)
Net income (loss) per share:
Basic (in USD per share)	$ 0.24	$ 0.20	$ 0.50	$ (0.67)
Diluted (in USD per share)	$ 0.23	$ 0.20	$ 0.47	$ (0.67)
Weighted-average shares outstanding:
Basic (in shares)	176,053,586	71,941,538	172,577,303	68,875,874
Diluted (in shares)	193,215,313	71,941,538	188,639,373	68,875,874