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v3.8.0.1

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 24, 2016
Cash flows from operating activities: |  |
Net income | $ 19,404 | $ 17,381
Reconciliation of net income to net cash provided by operating activities: |  |
Depreciation and amortization | 5,219 | 6,440
Stock-based compensation | 6,775 | 5,432
Disposal of fixed assets | 98 | 162
Inventory write-down | 1,412 | 1,451
Deferred income taxes | 2,153 | (14)
Changes in fair value of contingent payments to Zygo Corporation |  | 158
Changes in assets and liabilities: |  |
Accounts receivable | 1,418 | (986)
Inventories | (16,828) | 6,652
Inventories-delivered systems | (864) | (1,560)
Prepaid expenses and other | (3,850) | 889
Accounts payable, accrued and other liabilities | 709 | (4,310)
Deferred revenue | (1,204) | 3,825
Income taxes payable | 942 | (1,419)
Net cash provided by operating activities | 15,384 | 34,101
Cash flows from investing activities: |  |
Payments to acquire certain assets | (2,000) |
Sales of marketable securities | 28,624 | 2,093
Maturities of marketable securities | 62,923 | 25,461
Purchases of marketable securities | (104,984) | (63,840)
Purchases of property, plant and equipment | (2,342) | (3,349)
Net cash used in investing activities | (17,779) | (39,635)
Cash flows from financing activities: |  |
Payments to Zygo Corporation related to acquisition |  | (315)
Proceeds from sale of shares under employee stock option plans and purchase plan | 3,678 | 5,984
Taxes paid on net issuance of stock awards | (3,838) | (1,578)
Net cash provided by (used in) financing activities | (160) | 4,091
Effect of exchange rate changes on cash and cash equivalents | (466) | 710
Net decrease in cash and cash equivalents | (3,021) | (733)
Cash and cash equivalents, beginning of period | 47,062 | 38,154
Cash and cash equivalents, end of period | 44,041 | 37,421
Supplemental disclosure of non-cash investing activities: |  |
Transfer of inventory to property, plant and equipment, net |  | $ 1,208
Transfer of property, plant and equipment to inventory, net | $ 205 |

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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
Name: | us-gaap_ShareBasedCompensation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration