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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Operating activities: |  |  |
Net income (loss) | $ 4,649 | $ (703) | $ (50,674)
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |  |
Depreciation, depletion and accretion of asset retirement obligation | 27,472 | 26,488 | 25,308
Impairment loss | 0 | 0 | 2,170
Amortization of intangible assets | 793 | 792 | 792
(Gain) loss on disposal of assets | 1,802 | (294) | 555
Bad debt expense | 0 | 1 | 19,592
Amortization of deferred financing cost | 105 | 105 | 105
Accretion of debt discount | 186 | 186 | 183
Deferred income taxes | (6,137) | (4,196) | (10,547)
Stock-based compensation, net | 3,507 | 3,184 | 3,161
Employee stock purchase plan compensation | 24 | 25 | 34
Changes in assets and liabilities: |  |  |
Accounts receivable | 12,672 | (18,265) | 32,899
Unbilled receivables | (2,640) | 1,805 | (2,011)
Inventory | (6,638) | (5,161) | 1,942
Prepaid expenses and other assets | 1,996 | 6,524 | 751
Deferred revenue | (5,805) | (9,311) | 5,913
Settlement of asset retirement obligation | (197) | 0 | 0
Accounts payable | 1,974 | 5,244 | 4,508
Accrued expenses and other liabilities | (2,772) | (1,004) | (2,243)
Net cash provided by operating activities | 30,991 | 5,420 | 32,438
Investing activities: |  |  |
Acquisition, net of cash acquired | 0 | (6,547) | 0
Purchases of property, plant and equipment | (23,031) | (12,731) | (11,220)
Proceeds from disposal of assets | 129 | 1,070 | 78
Net cash used in investing activities | (22,902) | (18,208) | (11,142)
Financing activities: |  |  |
Repayments of notes payable | (10,435) | (7,325) | (6,771)
Payments under financing lease obligation | (394) | (116) | (123)
Proceeds from revolving credit facility | 23,000 | 10,000 | 0
Repayment of revolving credit facility | (15,000) | (10,000) | 0
Payment of contingent consideration | 0 | 0 | (180)
Proceeds from equity issuance | 56 | 52 | 42
Royalty stock issuance | 0 | 639 | 0
Purchase of treasury stock | (4,754) | (540) | (401)
Net cash used in financing activities | (7,527) | (7,290) | (7,433)
Net increase in cash and cash equivalents | 562 | (20,078) | 13,863
Cash and cash equivalents at beginning of year | 5,510 | 25,588 | 11,725
Cash and cash equivalents at end of year | $ 6,072 | $ 5,510 | $ 25,588

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