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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Operating activities: |  |
Net loss | $ (5,923) | $ (3,912)
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligation | 6,568 | 6,375
Amortization of intangible assets | 199 | 198
Loss on disposal of assets | 0 | 2
Amortization of deferred financing cost | 26 | 26
Accretion of debt discount | 47 | 47
Deferred income taxes | (4,175) | (7,691)
Stock-based compensation, net | 826 | 678
Employee stock purchase plan compensation | 5 | 7
Changes in assets and liabilities: |  |
Accounts receivable | (5,411) | 3,062
Unbilled receivables | (3,399) | (88)
Inventory | 1,441 | 1,590
Prepaid expenses and other assets | 3,835 | 1,140
Deferred revenue | (1,173) | 2,191
Accounts payable | (193) | 1,332
Accrued and other expenses | (1,335) | (1,043)
Net cash (used in) provided by operating activities | (8,662) | 3,914
Investing activities: |  |
Acquisition of Blair facility | 6,547 | 0
Purchases of property, plant and equipment | (3,768) | (2,213)
Proceeds from disposal of assets | 0 | (2)
Net cash used in investing activities | (10,315) | (2,215)
Financing activities: |  |
Repayments of notes payable | (1,776) | (1,672)
Payments under finance leases | 35 | 31
Payment of contingent consideration | 0 | (180)
Employee stock purchase plan issuance | 25 | 17
Purchase of treasury stock | (127) | (141)
Net cash used in financing activities | (1,913) | (2,007)
Net decrease in cash and cash equivalents | (20,890) | (308)
Cash and cash equivalents at beginning of year | 25,588 | 11,725
Cash and cash equivalents at end of period | 4,698 | 11,417
Noncash Investing and Financing Items [Abstract] |  |
Capitalized expenditures in accounts payable and accrued expenses | 157 | 1,097
Issuance of acquisition common stock | 0 | 20
Asset retirement obligation | $ 8,281 | $ 737

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