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Fair Value Measurements and Disclosures (Tables) | 6 Months Ended
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Jun. 29, 2013
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):
| June 29, 2013 |  | December 29, 2012
| 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 | $ | 486 |  |  | $ | — |  |  | $ | — |  |  | $ | 486 |  |  | $ | 109 |  |  | $ | — |  |  | $ | — |  |  | $ | 109 |
Commercial paper | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,600 |  |  | — |  |  | 2,600 |
Municipal securities | — |  |  | 2,001 |  |  | — |  |  | 2,001 |  |  | — |  |  | — |  |  | — |  |  | — |
Total cash equivalents | 486 |  |  | 2,001 |  |  | — |  |  | 2,487 |  |  | 109 |  |  | 2,600 |  |  | — |  |  | 2,709 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and U.S. Government agency securities | 20,100 |  |  | — |  |  | — |  |  | 20,100 |  |  | 20,568 |  |  | — |  |  | — |  |  | 20,568 |
Commercial paper, corporate debt securities, and municipal securities | — |  |  | 27,062 |  |  | — |  |  | 27,062 |  |  | — |  |  | 26,425 |  |  | — |  |  | 26,425 |
Total marketable securities | 20,100 |  |  | 27,062 |  |  | — |  |  | 47,162 |  |  | 20,568 |  |  | 26,425 |  |  | — |  |  | 46,993 |
Total (1) | $ | 20,586 |  |  | $ | 29,063 |  |  | $ | — |  |  | $ | 49,649 |  |  | $ | 20,677 |  |  | $ | 29,025 |  |  | $ | — |  |  | $ | 49,702 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payable | $ | — |  |  | $ | — |  |  | $ | 3,246 |  |  | $ | 3,246 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,462 |  |  | $ | 2,462 |
(1) Excludes $36.7 million and $60.2 million held in operating accounts as of June 29, 2013, and December 29, 2012, respectively.
Fair value measurement on recurring basis, unobservable input reconciliation |
Changes in Level 3 liabilities |
Fair value at December 29, 2012 | $ | 2,462 |
Payments made to Zygo Corporation | (216 | )
Change in fair value included in earnings | 1,000 |
Fair Value at June 29, 2013 | $ | 3,246 |

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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=7578670&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=7578670&loc=d3e19279-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=7578670&loc=d3e19190-110258 + Details
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