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v3.5.0.2

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 24, 2016 | Sep. 26, 2015
Cash flows from operating activities: |  |
Net income | $ 17,381 | $ 4,718
Reconciliation of net income to net cash provided by operating activities: |  |
Depreciation and amortization | 6,440 | 6,826
Stock-based compensation | 5,432 | 4,664
Disposal of fixed assets | 162 | 578
Inventory write-down | 1,451 | 1,971
Deferred income taxes | (14) | 173
Changes in fair value of contingent payments to Zygo Corporation | 158 | 137
Changes in assets and liabilities: |  |
Accounts receivable | (986) | (14,873)
Inventories | 6,652 | (15,893)
Inventories-delivered systems | (1,560) | 370
Prepaid expenses and other | 889 | 4,436
Accounts payable, accrued and other liabilities | (4,310) | 9,634
Deferred revenue | 3,825 | (688)
Income taxes payable | (1,419) | 295
Net cash provided by operating activities | 34,101 | 2,348
Cash flows from investing activities: |  |
Sales of marketable securities | 2,093 | 2,884
Maturities of marketable securities | 25,461 | 30,279
Purchases of marketable securities | (63,840) | (27,298)
Purchases of property, plant and equipment | (3,349) | (1,365)
Net cash provided by (used in) investing activities | (39,635) | 4,500
Cash flows from financing activities: |  |
Payments to Zygo Corporation related to acquisition | (315) | (614)
Proceeds from sale of shares under employee stock option plans and purchase plan | 5,984 | 3,642
Taxes paid on net issuance of stock awards | (1,578) | (1,104)
Repurchases of common stock |  | (1,721)
Net cash provided by financing activities | 4,091 | 203
Effect of exchange rate changes on cash and cash equivalents | 710 | (166)
Net increase (decrease) in cash and cash equivalents | (733) | 6,885
Cash and cash equivalents, beginning of period | 38,154 | 34,676
Cash and cash equivalents, end of period | 37,421 | 41,561
Supplemental disclosure of non-cash investing activities: |  |
Transfer of inventory to property, plant and equipment, net | 1,699 | $ 1,068
Transfer of property, plant and equipment to inventory, net | $ 491 |

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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=66010992&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=66902209&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + 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=64862545&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=66902209&loc=d3e3602-108585 + Details
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