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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Operating activities: |  |  |
Net (loss) income | $ (703) | $ (50,674) | $ 37,954
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |  |
Depreciation, depletion and accretion of asset retirement obligation | 26,488 | 25,308 | 22,130
Impairment loss | 0 | 2,170 | 5,115
Amortization of intangible assets | 792 | 792 | 793
(Gain) loss on disposal of assets | (294) | 555 | 237
Bad debt expense | 1 | 19,592 | 0
Amortization of deferred financing cost | 105 | 105 | 105
Accretion of debt discount | 186 | 183 | 185
Deferred income taxes | (4,196) | (10,547) | (2,573)
Stock-based compensation, net | 3,184 | 3,161 | 3,831
Employee stock purchase plan compensation | 25 | 34 | 34
Change in contingent consideration fair value | 0 | 0 | (1,410)
Gain on bargain purchase, net of cash acquired | 0 | 0 | (39,291)
Changes in assets and liabilities: |  |  |
Accounts receivable | (18,265) | 32,899 | (10,719)
Unbilled receivables | 1,805 | (2,011) | 4,638
Inventory | (5,161) | 1,942 | 4,738
Prepaid expenses and other assets | 6,524 | 751 | (5,327)
Deferred revenue | (9,311) | 5,913 | 1,032
Accounts payable | 5,244 | 4,508 | (370)
Accrued expenses and other liabilities | (1,004) | (2,243) | 4,981
Income taxes payable | 0 | 0 | (542)
Net cash provided by operating activities | 5,420 | 32,438 | 25,541
Investing activities: |  |  |
Acquisition, net of cash acquired | (6,547) | 0 | 0
Purchases of property, plant and equipment | (12,731) | (11,220) | (8,620)
Proceeds from disposal of assets | 1,070 | 78 | 61
Net cash used in investing activities | (18,208) | (11,142) | (8,559)
Financing activities: |  |  |
Proceeds from the issuance of notes payable | 0 | 0 | 952
Repayments of notes payable | (7,325) | (6,771) | (4,802)
Payments under financing lease obligation | (116) | (123) | (123)
Payment of deferred financing and debt issuance costs | 0 | 0 | (20)
Proceeds from revolving credit facility | 10,000 | 0 | 6,000
Repayment of revolving credit facility | (10,000) | 0 | (8,500)
Payment of contingent consideration | 0 | (180) | (310)
Proceeds from equity issuance | 52 | 42 | 62
Royalty stock issuance | 639 | 0 | 0
Purchase of treasury stock | (540) | (401) | (1,155)
Net cash used in financing activities | (7,290) | (7,433) | (7,896)
Effect of exchange rate changes on cash and cash equivalents | 0 | 0 | 0
Net increase in cash and cash equivalents | (20,078) | 13,863 | 9,086
Cash and cash equivalents at beginning of year | 25,588 | 11,725 | 2,639
Cash and cash equivalents at end of year | $ 5,510 | $ 25,588 | $ 11,725

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