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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016 | Dec. 26, 2015
Cash flows from operating activities: |  |  |
Net income | $ 30,202 | $ 44,035 | $ 2,905
Reconciliation of net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 6,920 | 8,295 | 9,075
Stock-based compensation | 8,819 | 7,666 | 6,248
Excess tax benefit from equity awards |  | 1,036 |
Disposal of fixed assets | 631 | 478 | 1,121
Inventory write-down | 2,020 | 2,110 | 2,645
Deferred income taxes | 6,858 | (16,783) | 345
Changes in fair value of contingent payments to Zygo Corporation |  | (1,175) | (56)
Changes in assets and liabilities: |  |  |
Accounts receivable | (19,523) | (2,707) | (12,610)
Inventories | (18,037) | 4,526 | (16,431)
Inventories-delivered systems | 923 | 399 | (943)
Prepaid expenses and other | (230) | 905 | 3,271
Accounts payable, accrued and other liabilities | 1,049 | 2,462 | 4,167
Deferred revenue | (915) | (3,634) | 1,006
Income taxes payable | 1,886 | (1,928) | 828
Net cash provided by operating activities | 20,603 | 45,685 | 1,571
Cash flows from investing activities: |  |  |
Payment for acquisition of certain assets | (2,000) |  |
Sales of marketable securities | 53,030 | 5,955 | 3,383
Maturities of marketable securities | 77,250 | 38,775 | 41,863
Purchases of marketable securities | (129,766) | (82,864) | (41,449)
Purchases of property, plant and equipment | (5,204) | (3,999) | (1,846)
Net cash (used in) provided by investing activities | (6,690) | (42,133) | 1,951
Cash flows from financing activities: |  |  |
Payments to Zygo Corporation related to acquisition |  | (315) | (851)
Proceeds from sale of shares under employee stock option plans and purchase plan | 5,576 | 8,447 | 3,974
Excess tax benefit from equity awards |  | (1,036) |
Taxes paid on net issuance of stock awards | (4,135) | (1,822) | (1,182)
Net cash (used in) provided by financing activities | (25,558) | 5,274 | 220
Effect of exchange rate changes on cash and cash equivalents | (518) | 82 | (264)
Net (decrease) increase in cash and cash equivalents | (12,163) | 8,908 | 3,478
Cash and cash equivalents, beginning of period | 47,062 | 38,154 | 34,676
Cash and cash equivalents, end of period | 34,899 | 47,062 | 38,154
Supplemental disclosure of cash flow information: |  |  |
Cash paid (refund) for income taxes, net | 3,040 | 3,767 | (826)
Supplemental disclosure of non-cash investing activities: |  |  |
Transfer of inventory to property, plant and equipment, net | 2,451 | 2,345 | 1,469
Property, plant and equipment included in accounts payable | 957 | $ 683 | 36
Share Repurchase Plans [Member] |  |  |
Cash flows from financing activities: |  |  |
Repurchases of common stock | $ (26,999) |  | $ (1,721)

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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + 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 (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 + Details
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- Definition The cash inflow associated with the sale of debt securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of increase (decrease) of physical assets used in the normal conduct of business and not intended for resale, from reclassification, impairment, donation, or changes classified as other. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 + 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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