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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Operating activities:    
Net loss $ (3,860) $ (24,231)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligations 7,528 7,299
Amortization of intangible assets 199 198
Net gain on disposal of fixed assets (297) (40)
Amortization of deferred financing cost 64 46
Deferred income taxes (982) 16,662
Stock-based compensation, net 960 934
Employee stock purchase plan compensation 10 6
Changes in assets and liabilities:    
Accounts receivable 2,123 13,015
Unbilled receivables (121) 2,408
Inventory 629 (3,265)
Prepaid expenses and other assets (721) (1,712)
Deferred revenue (8,797) 423
Accounts payable 1,534 (4,061)
Accrued and other expenses 4,774 1,042
Net cash provided by operating activities 3,043 8,724
Investing activities:    
Purchases of property, plant and equipment (2,201) (3,536)
Proceeds from disposal of assets 0 1
Net cash used in investing activities (2,201) (3,535)
Financing activities:    
Dividend payments to stockholders 0 (7)
Repayments of notes payable (1,188) (955)
Proceeds from revolving credit facility 0 11,000
Repayment of revolving credit facility 0 (11,000)
Payments under finance leases (61) (58)
Employee stock purchase plan issuance 20 26
Repurchase of treasury stock from restricted stock vesting (1,238) (336)
Repurchase of treasury stock from Repurchase Program (1,472) (305)
Net cash used in financing activities (3,939) (1,635)
Net (decrease) increase in cash and cash equivalents (3,097) 3,554
Cash and cash equivalents at beginning of year 22,551 1,554
Cash and cash equivalents at end of period 19,454 5,108
Supplemental disclosure of cash flow information    
Purchases of property, plant and equipment in accounts payable and accrued expenses 1,838 610
Fixed assets purchased with debt $ 2,095 $ 515