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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Cash flows from operating activities    
Net loss $ (3,770) $ (15,539)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation, amortization, depletion and accretion 6,090 7,276
Stock-based compensation expense 2,185 1,810
Operating lease expense 1,518 2,061
Amortization of debt discount and debt issuance costs 450 395
Gain on sale of assets (154) (2,695)
Earnings from equity method investments (127) (1,512)
Other non-cash items, net (113) 0
Changes in operating assets and liabilities:    
Receivables and related party receivables (399) (359)
Prepaid expenses and other assets 1,812 3,595
Inventories, net 2,486 (811)
Other long-term assets, net (1,366) (3,646)
Accounts payable and accrued expenses (2,611) (12,033)
Other current liabilities 1,467 148
Operating lease liabilities (1,255) (140)
Other long-term liabilities (945) 305
Net cash provided by (used in) operating activities 5,268 (21,145)
Cash flows from investing activities    
Acquisition of property, plant, equipment, and intangible assets, net (42,210) (17,008)
Acquisition of mine development costs (167) (1,856)
Proceeds from sale of property and equipment 150 0
Distributions from equity method investees in excess of cumulative earnings 127 1,512
Cash and restricted cash acquired in business acquisition 0 2,225
Payment for disposal of Marshall Mine, LLC 0 (2,177)
Net cash used in investing activities (42,100) (17,304)
Cash flows from financing activities    
Net proceeds from common stock issued in private placement transactions 14,951 15,220
Repurchase of common stock to satisfy tax withholdings (1,109) (208)
Principal payments on finance lease obligations (838) (855)
Principal payments on notes payable (404) (341)
Net proceeds from CFG Loan, related party, net of discount and issuance costs 0 8,522
Net cash provided by financing activities 40,059 23,338
Increase (decrease) in Cash and Restricted Cash 3,227 (15,111)
Cash and Restricted Cash, beginning of period 54,153 76,432
Cash and Restricted Cash, end of period 57,380 61,321
Supplemental disclosure of non-cash investing and financing activities:    
Change in accrued purchases for property and equipment 8,199 255
Purchase of property and equipment through note payable 258 0
Equity issued as consideration for acquisition of business 0 31,206
Paid-in-kind dividend on Series A Preferred Stock 0 157
Public Offerings    
Cash flows from financing activities    
Net proceeds from common stock issued 26,659 0
Related Party    
Cash flows from financing activities    
Net proceeds from common stock issued $ 800 $ 1,000