CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Cash flows used in operating activities:
Net loss	$ (60,896)	$ (55,024)
Adjustments to reconcile net loss for the period to net cash used in operating activities:
Non-cash interest expense, including accelerated amortization of original issue discount and issuance costs	18,174	12,255
Asset retirement obligation adjustments and accretion expense	7,116	(1,800)
Stock-based compensation	2,627	2,920
Depreciation and amortization	2,233	2,814
Miscellaneous loss	555	320
Gain on settlement of accounts payable	0	(1,151)
Gain on sale of assets	(7,860)	(544)
Changes in operating assets and liabilities:
Receivables, net	1,828	2,566
Prepaids and deposits	1,410	(1,991)
Accounts payable, accrued expenses, and other liabilities	846	(1,763)
Supplies inventories, net	8	479
Payments for asset retirement obligations	(1,938)	(529)
Net cash used in operating activities	(35,897)	(41,448)
Cash flows provided by (used in) investing activities:
Proceeds from sale of assets	7,580	563
Additions to property, plant, and equipment	(1,253)	(1,070)
Net cash provided by (used in) investing activities	6,327	(507)
Cash flows used in financing activities:
Proceeds from issuance of common stock	12,577	1,140
Public offering issuance costs	(379)	(273)
Principal payments	(38,120)	(2,328)
Net cash used in financing activities	(25,922)	(1,461)
Net decrease in cash, cash equivalents, and restricted cash	(55,492)	(43,416)
Cash, cash equivalents, and restricted cash, beginning of period	132,550	175,966
Cash, cash equivalents, and restricted cash, end of period	77,058	132,550
Reconciliation of cash, cash equivalents, and restricted cash:
Cash and cash equivalents	49,560	106,210
Restricted cash	27,498	26,340
Total cash, cash equivalents, and restricted cash	$ 77,058	$ 132,550