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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Operating activities: |  |
Net loss | $ (216) | $ (3,599)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligations | 7,241 | 6,553
Amortization of intangible assets | 199 | 199
Net loss on disposal of fixed assets | 3 | 1,889
Amortization of deferred financing cost | 26 | 26
Accretion of debt discount | 47 | 47
Deferred income taxes | 596 | 1,669
Stock-based compensation, net | 642 | 779
Employee stock purchase plan compensation | 6 | 7
Changes in assets and liabilities: |  |
Accounts receivable | (9,344) | (74)
Unbilled receivables | (2,640) | (1,363)
Inventory | 1,240 | 101
Prepaid expenses and other assets | (240) | (676)
Deferred revenue | 1,220 | (1,058)
Accounts payable | (6,730) | 1,165
Accrued and other expenses | 4,087 | (560)
Net cash (used in) provided by operating activities | (3,863) | 5,105
Investing activities: |  |
Purchases of property, plant and equipment | (1,646) | (4,018)
Proceeds from disposal of assets | 1 | 1
Net cash used in investing activities | (1,645) | (4,017)
Financing activities: |  |
Repayments of notes payable | (1,340) | (1,513)
Payments under finance leases | (56) | (86)
Payment of deferred financing and debt issuance costs | (425) | 0
Proceeds from revolving credit facility | 6,000 | 14,000
Repayment of revolving credit facility | 0 | (7,000)
Employee stock purchase plan issuance | 25 | 33
Purchase of treasury stock | (170) | (4,428)
Net cash provided by financing activities | 4,034 | 1,006
Net (decrease) increase in cash and cash equivalents | (1,474) | 2,094
Cash and cash equivalents at beginning of year | 6,072 | 5,510
Cash and cash equivalents at end of period | 4,598 | 7,604
Supplemental disclosure of cash flow information |  |
Purchases of property, plant and equipment in accounts payable and accrued expenses | 1,544 | 1,975
Treasury stock purchased with debt | $ 0 | $ 4,425

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