CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
OPERATING ACTIVITIES FROM CONTINUING OPERATIONS:
Net loss	$ (15,879)	$ (32,452)
Income from discontinued operations	(12)	(696)
Net loss from continuing operations	(15,867)	(31,756)
Adjustments to reconcile net loss from continuing operations to net cash flow from operating activities:
Depreciation	9,909	10,368
Accrued interest added to principal	0	1,212
Change in fair value of warrant asset	420	0
Amortization of debt issuance costs	825	2,137
Impairment of long-lived assets	169	4,000
Loss (gain) on sale of assets	661	(1,752)
Gain on digital assets	(204)	0
Remeasurement of environmental liability	0	1,600
Stock-based compensation expense	1,798	1,531
Revenues from digital assets production	(15,041)	0
Proceeds from sale of digital assets	11,141	0
Professional fees paid in common stock	0	250
Changes in operating assets and liabilities:
Accounts receivable	346	2,421
Emissions and carbon offset credits	220	(337)
Digital assets	0	348
Prepaids and other assets	1,668	(1,801)
Income tax receivable	(89)	(59)
Accounts payable	(299)	7,518
Accrued emissions	(4,374)	1,872
Accrued expenses	(1,874)	(2,717)
Contract liabilities	2,200	0
Other long-term liabilities	0	4,713
Other	229	(458)
Net cash flow used for operating activities from continuing operations	(8,162)	(910)
INVESTING ACTIVITIES FROM CONTINUING OPERATIONS:
Purchases of and deposits for property and equipment	(6,938)	(10,952)
Proceeds from sale of assets	1,878	600
Proceeds from sale of digital assets	628	0
Net cash flow used for investing activities from continuing operations	(4,432)	(10,352)
FINANCING ACTIVITIES FROM CONTINUING OPERATIONS:
Proceeds from issuance of common stock, net of issuance costs	1,038	11,475
Proceeds from issuance of common stock and pre-funded warrants	6,000	0
Principal payments on debt	0	(6,809)
Net cash flow provided by financing activities from continuing operations	7,038	4,666
Discontinued Operations:
Net cash flow from operating activities of discontinued operations	(186)	(1,259)
Net cash flow from investing activities of discontinued operations	0	3,325
Increase (decrease) in cash and cash equivalents from discontinued operations	(186)	2,066
CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(5,742)	(4,530)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - beginning of year	13,312	15,217
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - end of period	$ 7,570	$ 10,687