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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
Operating activities: |  |
Net (loss) income | $ (744) | $ 9,435
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligations | 21,090 | 20,359
Amortization of intangible assets | 596 | 596
Net loss on disposal of fixed assets | 1,069 | 1,821
Amortization of deferred financing cost | 89 | 79
Accretion of debt discount | 92 | 140
Loss on extinguishment of debt | 1,341 | 0
Deferred income taxes | (2,217) | (4,096)
Stock-based compensation, net | 2,348 | 2,472
Employee stock purchase plan compensation | 18 | 20
Changes in assets and liabilities: |  |
Accounts receivable | (933) | 11,888
Unbilled receivables | (181) | (244)
Inventory | (1,015) | (5,770)
Prepaid expenses and other assets | (39) | 4,856
Deferred revenue | 196 | (4,942)
Accounts payable | (6,219) | (3,871)
Accrued and other expenses | 1,338 | 907
Net cash provided by operating activities | 16,829 | 33,650
Investing activities: |  |
Purchases of property, plant and equipment | (5,135) | (16,126)
Proceeds from disposal of assets | 81 | 123
Net cash used in investing activities | (5,054) | (16,003)
Financing activities: |  |
Proceeds from the issuance of notes payable | 9,755 | 0
Repayments of notes payable | (9,540) | (8,952)
Proceeds from revolving credit facility | 16,975 | 15,000
Repayment of revolving credit facility | (24,975) | (15,000)
Payments under finance leases | (167) | (323)
Payment of deferred financing and debt issuance costs | (1,129) | 0
Payment for debt extinguishment costs | (1,227) | 0
Employee stock purchase plan issuance | 51 | 56
Purchase of treasury stock | (375) | (4,629)
Net cash used in financing activities | (10,632) | (13,848)
Net increase (decrease) in cash and cash equivalents | 1,143 | 3,799
Cash and cash equivalents at beginning of year | 6,072 | 5,510
Cash and cash equivalents at end of period | 7,215 | 9,309
Supplemental disclosure of cash flow information |  |
Purchases of property, plant and equipment in accounts payable and accrued expenses | 1,517 | 2,351
Treasury stock purchased with debt | 0 | 4,425
Fixed assets purchased with debt | $ 2,214 | $ 0

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