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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Operating activities: |  |
Net income | $ 975 | $ 969
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation, depletion and accretion of asset retirement obligation | 3,294 | 1,687
Asset retirement obligation settlement | (1,249) | 0
(Gain) on disposal of assets | 0 | (37)
Amortization of deferred financing cost | 60 | 106
Accretion of debt discount | 56 | 0
Deferred income taxes | 307 | 324
Stock-based compensation | 610 | 176
Changes in assets and liabilities: |  |
Accounts receivable | (4,314) | (4,101)
Unbilled receivables | 986 | (953)
Inventories | 3,820 | 4,308
Prepaid expenses and other assets | (3,586) | (181)
Deferred revenue | 872 | (1,615)
Accounts payable | (7,587) | 77
Accrued and other expenses | 4,144 | 2,893
Income taxes payable | 0 | 191
Net cash (used in) provided by operating activities | (1,612) | 3,844
Investing activities: |  |
Purchases of property, plant and equipment | (46,869) | (1,623)
Proceeds from disposal of assets | 0 | 14
Net cash used in investing activities | (46,869) | (1,609)
Financing activities: |  |
Repayments of notes payable | 0 | (4)
Payments under equipment financing obligations | (70) | (102)
Payment of deferred financing costs | 0 | (188)
Proceeds from revolving credit facility | 16,000 | 0
Proceeds from equity issuance | 0 | 26,251
Payment of equity transaction costs | 0 | (2,083)
Purchase of treasury stock | (54) | 0
Net cash provided by financing activities | 15,876 | 23,874
Net (decrease) increase in cash, cash equivalents and restricted cash | (32,605) | 26,109
Cash and cash equivalents and restricted cash at beginning of year | 35,227 | 47,534
Cash and cash equivalents and restricted cash at end of period | 2,622 | 73,643
Supplemental disclosure of cash flow information |  |
Cash paid for interest | 95 | 15
Cash paid for taxes | 207 | 29
Non-cash investing activities: |  |
Asset retirement obligation | 250 | 0
Non-cash financing activities: |  |
Capitalized expenditures in accounts payable and accrued expenses | $ 11,488 | $ 500

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow for a borrowing supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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