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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Operating activities: |  |
Net income (loss) | $ 9,435 | $ (3,329)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligations | 20,359 | 19,904
Amortization of intangible assets | 596 | 596
Loss (gain) on disposal of fixed assets | 1,821 | (482)
Provision for bad debt | 0 | 1
Amortization of deferred financing cost | 79 | 79
Accretion of debt discount | 140 | 140
Deferred income taxes | (4,096) | (2,784)
Stock-based compensation | 2,472 | 2,436
Employee stock purchase plan compensation | 20 | 18
Changes in assets and liabilities: |  |
Accounts receivable | 11,888 | (14,238)
Unbilled receivables | (244) | (593)
Inventory | (5,770) | (5,594)
Prepaid expenses and other assets | 4,856 | 3,072
Deferred revenue | (4,942) | (6,365)
Accounts payable | (3,871) | 2,784
Accrued and other expenses | 907 | 4,187
Net cash provided by (used in) operating activities | 33,650 | (168)
Investing activities: |  |
Acquisition of Blair facility | 0 | (6,547)
Purchases of property, plant and equipment | (16,126) | (9,535)
Proceeds from disposal of assets | 123 | 995
Net cash used in investing activities | (16,003) | (15,087)
Financing activities: |  |
Repayments of notes payable | (8,952) | (5,474)
Payments under finance leases | (323) | (88)
Proceeds from revolving credit facility | 15,000 | 6,000
Repayment of revolving credit facility | (15,000) | 0
Employee stock purchase plan issuance | 56 | 52
Purchase of treasury stock | (4,629) | (451)
Net cash used in financing activities | (13,848) | 39
Net decrease in cash and cash equivalents | 3,799 | (15,216)
Cash and cash equivalents at beginning of year | 5,510 | 25,588
Cash and cash equivalents at end of period | 9,309 | 10,372
Noncash Investing and Financing Items [Abstract] |  |
Purchases of property, plant and equipment in accounts payable and accrued expenses | 2,351 | 685
Other Significant Noncash Transaction, Value of Consideration Given | 4,425 | 0
Additions to asset retirement obligations | $ 0 | $ 8,281

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