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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Operating activities: |  |
Net loss | $ (3,912) | $ (84)
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligation | 6,375 | 5,363
Amortization of intangible assets | 198 | 199
Loss on disposal of assets | 2 | 0
Amortization of deferred financing cost | 26 | 26
Accretion of debt discount | 47 | 45
Deferred income taxes | (7,691) | 1,264
Stock-based compensation, net | 678 | 1,025
Employee stock purchase plan compensation | 7 | 13
Change in contingent consideration fair value | 0 | (1,020)
Changes in assets and liabilities: |  |
Accounts receivable | 3,062 | 1,095
Unbilled receivables | (88) | 4,536
Inventories | 1,590 | 3,642
Prepaid expenses and other assets | 1,140 | (1,933)
Deferred revenue | 2,191 | (2,575)
Accounts payable | 1,332 | 2,048
Accrued and other expenses | (1,043) | (1,471)
Income taxes payable | 0 | (112)
Net cash provided by operating activities | 3,914 | 12,061
Investing activities: |  |
Purchases of property, plant and equipment | (2,213) | (4,185)
Proceeds from disposal of assets | (2) | 0
Net cash used in investing activities | (2,215) | (4,185)
Financing activities: |  |
Repayments of notes payable | (1,672) | (1,192)
Payments under equipment financing obligations | (31) | (32)
Payment of deferred financing and debt issuance costs | 0 | (20)
Proceeds from revolving credit facility | 0 | 6,000
Repayment of revolving credit facility | 0 | (2,500)
Payment of contingent consideration | (180) | (280)
Proceeds from equity issuance | 17 | 46
Purchase of treasury stock | (141) | (1,014)
Net cash (used in) provided by financing activities | (2,007) | 1,008
Net increase in cash and cash equivalents | (308) | 8,884
Cash and cash equivalents at beginning of year | 11,725 | 2,639
Cash and cash equivalents at end of period | 11,417 | 11,523
Noncash Investing and Financing Items [Abstract] |  |
Asset retirement obligation | 737 | 0
Capitalized expenditures in accounts payable and accrued expenses | 1,097 | 1,269
Stock Issued | $ 20 | $ 0

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