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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Operating activities: |  |
Net (loss) income | $ (38,441) | $ 40,839
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligation | 18,937 | 16,092
Amortization of intangible assets | 596 | 596
Loss on disposal of assets | 223 | 299
Bad debt expense | 19,592 | 0
Amortization of deferred financing cost | 79 | 79
Accretion of debt discount | 140 | 138
Deferred income taxes | (7,543) | 238
Stock-based compensation, net | 2,131 | 2,909
Employee stock purchase plan compensation | 24 | 29
Change in contingent consideration fair value | 0 | (1,020)
Gain on bargain purchase, net of cash acquired | 0 | (39,580)
Changes in assets and liabilities: |  |
Accounts receivable | 34,791 | (7,029)
Unbilled receivables | (1,113) | (4,491)
Inventory | 3,755 | 306
Prepaid expenses and other assets | (1,886) | 3,751
Deferred revenue | 6,092 | 3,912
Accounts payable | 1,564 | (205)
Accrued and other expenses | (1,397) | (607)
Income taxes payable | 0 | 5,968
Net cash provided by operating activities | 37,544 | 22,224
Investing activities: |  |
Purchases of property, plant and equipment | (6,976) | (7,444)
Proceeds from disposal of assets | 78 | 51
Net cash used in investing activities | (6,898) | (7,393)
Financing activities: |  |
Proceeds from the issuance of notes payable | 0 | 952
Repayments of notes payable | (5,168) | (3,527)
Payments under equipment financing obligations | (92) | (87)
Payment of deferred financing and debt issuance costs | 0 | (20)
Proceeds from revolving credit facility | 0 | 6,000
Repayment of revolving credit facility | 0 | (8,500)
Payment of contingent consideration | (180) | (310)
Proceeds from equity issuance | 42 | 62
Purchase of treasury stock | (294) | (1,046)
Net cash used in financing activities | (5,692) | (6,476)
Net increase in cash and cash equivalents | 24,954 | 8,355
Cash and cash equivalents at beginning of year | 11,725 | 2,639
Cash and cash equivalents at end of period | 36,679 | 10,994
Noncash Investing and Financing Items [Abstract] |  |
Capitalized expenditures in accounts payable and accrued expenses | $ 267 | $ 157

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