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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Operating activities: |  |
Net loss | $ (6,013) | $ (31,179)
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligation | 13,206 | 12,604
Amortization of intangible assets | 398 | 398
Gain on disposal of assets | (16) | (58)
Bad debt expense | 1 | 19,592
Amortization of deferred financing cost | 53 | 53
Accretion of debt discount | 93 | 93
Deferred income taxes | (3,264) | (5,839)
Stock-based compensation, net | 1,628 | 1,252
Employee stock purchase plan compensation | 11 | 14
Changes in assets and liabilities: |  |
Accounts receivable | (10,974) | 39,756
Unbilled receivables | (6,635) | (1,094)
Inventory | (1,850) | 3,199
Prepaid expenses and other assets | 1,854 | (2,391)
Deferred revenue | (4,542) | 1,215
Accounts payable | 3,229 | 1,698
Accrued and other expenses | 1,872 | (2,833)
Net cash (used in) provided by operating activities | (10,949) | 36,480
Investing activities: |  |
Acquisition of Blair facility | (6,547) | 0
Purchases of property, plant and equipment | (5,137) | (5,043)
Proceeds from disposal of assets | 0 | 2
Net cash used in investing activities | (11,684) | (5,041)
Financing activities: |  |
Repayments of notes payable | (3,581) | (3,370)
Payments under finance leases | (60) | (65)
Proceeds from revolving credit facility | 3,000 | 0
Payment of contingent consideration | 0 | (180)
Employee stock purchase plan issuance | 25 | 17
Purchase of treasury stock | (241) | (288)
Net cash used in financing activities | (857) | (3,886)
Net decrease in cash and cash equivalents | (23,490) | 27,553
Cash and cash equivalents at beginning of year | 25,588 | 11,725
Cash and cash equivalents at end of period | 2,098 | 39,278
Noncash Investing and Financing Items [Abstract] |  |
Capitalized expenditures in accounts payable and accrued expenses | 927 | 172
Issuance of acquisition common stock | 0 | 20
Asset retirement obligation | $ 8,281 | $ 737

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