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Fair Value Measurements and Disclosures (Tables) | 9 Months Ended
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Sep. 24, 2016
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 24, 2016 |  |  | December 26, 2015 |
|  | 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 |  | $ | 840 |  |  | $ | — |  |  | $ | — |  |  | $ | 840 |  |  | $ | 590 |  |  | $ | — |  |  | $ | — |  |  | $ | 590 |
Commercial paper and corporate debt securities |  |  | — |  |  |  | 4,244 |  |  |  | — |  |  |  | 4,244 |  |  |  | — |  |  |  | 4,568 |  |  |  | — |  |  |  | 4,568 |
Total cash equivalents |  | $ | 840 |  |  | $ | 4,244 |  |  | $ | — |  |  | $ | 5,084 |  |  | $ | 590 |  |  | $ | 4,568 |  |  | $ | — |  |  | $ | 5,158 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities and U.S. Government agency debt securities |  |  | — |  |  |  | 21,256 |  |  |  | — |  |  |  | 21,256 |  |  |  | 4,401 |  |  |  | 20,164 |  |  |  | — |  |  |  | 24,565 |
Certificates of deposits |  |  | — |  |  |  | 16,008 |  |  |  | — |  |  |  | 16,008 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Commercial paper |  |  | — |  |  |  | 23,848 |  |  |  | — |  |  |  | 23,848 |  |  |  | — |  |  |  | 1,884 |  |  |  | — |  |  |  | 1,884 |
Municipal securities and corporate debt securities |  |  | — |  |  |  | 12,526 |  |  |  | — |  |  |  | 12,526 |  |  |  | — |  |  |  | 18,482 |  |  |  | — |  |  |  | 18,482 |
Asset-backed Securities |  |  | — |  |  |  | 7,468 |  |  |  | — |  |  |  | 7,468 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total marketable securities |  | $ | — |  |  | $ | 81,106 |  |  | $ | — |  |  | $ | 81,106 |  |  | $ | 4,401 |  |  | $ | 40,530 |  |  | $ | — |  |  | $ | 44,931 |
Total(1) |  | $ | 840 |  |  | $ | 85,350 |  |  | $ | — |  |  | $ | 86,190 |  |  | $ | 4,991 |  |  | $ | 45,098 |  |  | $ | — |  |  | $ | 50,089 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration payable |  | $ | — |  |  | $ | — |  |  | $ | 1,333 |  |  | $ | 1,333 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,490 |  |  | $ | 1,490 |
(1) | Excludes $32.3 million and $33.0 million held in operating accounts as of September 24, 2016 and December 26, 2015, respectively.
Fair value measurement on recurring basis, unobservable input reconciliation |
Changes in Level 3 liabilities |  | (in thousands) |
Fair value at December 26, 2015 |  | $ | 1,490 |
Payments made to Zygo Corporation |  |  | (315 | )
Change in fair value included in earnings |  |  | 158 |
Fair value at September 24, 2016 |  | $ | 1,333 |
Outstanding derivative instruments | The following table summarizes the Company’s outstanding derivative instruments on a gross basis as of September 24, 2016:
|  | Notional Principal |
|  | (in millions) |
Undesignated Hedges: |  |  |  |
Forward Foreign Currency Contracts |  | $ | 15.9 |

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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=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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