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Fair Value Measurements and Disclosures (Tables) | 9 Months Ended
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Sep. 27, 2014
Fair Value Disclosures [Abstract] |
Assets and liabilities measurements at estimated fair value on recurring basis excluding accrued interest components | The following tables present the Company’s assets and liabilities measured at estimated fair value on a recurring basis, excluding accrued interest components, categorized in accordance with the fair value hierarchy (in thousands), as of the following dates:
| September 27, 2014 |  | December 28, 2013
| Fair Value Measurements Using Input Types |  |  |  | Fair Value Measurements Using Input Types |  |
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 549 |  |  | $ | — |  |  | $ | — |  |  | $ | 549 |  |  | $ | 876 |  |  | $ | — |  |  | $ | — |  |  | $ | 876 |
Commercial paper | — |  |  | 650 |  |  | — |  |  | 650 |  |  | — |  |  | 750 |  |  | — |  |  | 750 |
Total cash equivalents | 549 |  |  | 650 |  |  | — |  |  | 1,199 |  |  | 876 |  |  | 750 |  |  | — |  |  | 1,626 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury, U.S. Government and U.S. Government agency debt securities | 2,498 |  |  | 18,687 |  |  | — |  |  | 21,185 |  |  | 5,036 |  |  | 11,980 |  |  | — |  |  | 17,016 |
Commercial paper, municipal securities and corporate debt securities | — |  |  | 27,563 |  |  | — |  |  | 27,563 |  |  | — |  |  | 31,081 |  |  | — |  |  | 31,081 |
Total marketable securities | 2,498 |  |  | 46,250 |  |  | — |  |  | 48,748 |  |  | 5,036 |  |  | 43,061 |  |  | — |  |  | 48,097 |
Total (1) | $ | 3,047 |  |  | $ | 46,900 |  |  | $ | — |  |  | $ | 49,947 |  |  | $ | 5,912 |  |  | $ | 43,811 |  |  | $ | — |  |  | $ | 49,723 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payable | $ | — |  |  | $ | — |  |  | $ | 2,431 |  |  | $ | 2,431 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,783 |  |  | $ | 2,783 |
(1) Excludes cash of $34.4 million and $43.1 million held in operating accounts as of September 27, 2014 and December 28, 2013, respectively.
Fair value measurement on recurring basis, unobservable input reconciliation |
Changes in Level 3 liabilities (in thousands) |
Fair value at December 28, 2013 | $ | 2,783 |
Payments made to Zygo Corporation | (470 | )
Change in fair value included in earnings | 118 |
Fair Value at September 27, 2014 | $ | 2,431 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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