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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Operating activities: |  |
Net income | $ 4,556 | $ 18,309
Adjustments to reconcile net (loss) income to net cash provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligation | 10,697 | 12,501
Amortization of intangible assets | 398 | 837
Asset retirement obligation settlement | 0 | (1,883)
Gain on disposal of assets | 275 | 0
Amortization of deferred financing cost | 53 | 117
Accretion of debt discount | 92 | 331
Deferred income taxes | 1,004 | 4,287
Stock-based compensation, net | 1,968 | 1,544
Employee stock purchase plan compensation | 25 | 18
Change in contingent consideration fair value | (1,020) | (1,542)
Imputed interest | 61 | 0
Changes in assets and liabilities: |  |
Accounts receivable | 2,957 | (26,663)
Unbilled receivables | 4,717 | 512
Inventories | 1,128 | 6,194
Prepaid expenses and other assets | 460 | 1,587
Deferred revenue | (2,196) | (694)
Accounts payable | (361) | (1,977)
Accrued and other expenses | (2,618) | 3,925
Income taxes payable | 3,646 | 0
Net cash provided by operating activities | 25,842 | 17,403
Investing activities: |  |
Purchases of property, plant and equipment | (6,423) | (13,869)
Net cash used in investing activities | (6,423) | (13,869)
Financing activities: |  |
Proceeds from the issuance of notes payable | 952 | 4,696
Repayments of notes payable | (2,482) | (734)
Payments under equipment financing obligations | (56) | (50)
Payment of deferred financing and debt issuance costs | (20) | (835)
Proceeds from revolving credit facility | 6,000 | 22,750
Repayment of revolving credit facility | (8,500) | (28,250)
Payment of contingent consideration | (310) | (1,225)
Proceeds from equity issuance | 46 | 40
Purchase of treasury stock | (1,045) | (139)
Net cash provided by financing activities | (5,415) | (3,747)
Net increase in cash and cash equivalents | 14,004 | (213)
Cash and cash equivalents at beginning of year | 2,639 | 1,466
Cash and cash equivalents at end of period | 16,643 | 1,253
Noncash Investing and Financing Items [Abstract] |  |
Asset retirement obligation | 0 | 3,301
Capitalized expenditures in accounts payable and accrued expenses | $ 225 | $ 1,237

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