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Fair Value Measurements (Tables) | 9 Months Ended
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Oct. 01, 2017
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured On Recurring Basis |
| As of October 1, 2017
| Total |  | Quoted market prices in active markets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
| (In thousands)
Assets: |  |  |  |  |  |  |
Cash equivalents: money-market funds | $ | 15,105 |  |  | $ | 15,105 |  |  | $ | — |  |  | $ | — |
Available-for-sale securities: U.S. treasuries (1) | 124,087 |  |  | 124,087 |  |  | — |  |  | — |
Available-for-sale securities: certificates of deposit (1) | 162 |  |  | 162 |  |  | — |  |  | — |
Trading securities: mutual funds (1) | 1,964 |  |  | 1,964 |  |  | — |  |  | — |
Foreign currency forward contracts (2) | 2,540 |  |  | — |  |  | 2,540 |  |  | — |
Total assets measured at fair value | $ | 143,858 |  |  | $ | 141,318 |  |  | $ | 2,540 |  |  | $ | — |
________________________
(1) | Included in short-term investments on the Company’s unaudited condensed consolidated balance sheets.
(2) | Included in prepaid expenses and other current assets on the Company’s unaudited condensed consolidated balance sheets.
| As of December 31, 2016
| Total |  | Quoted market prices in active markets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
| (In thousands)
Assets: |  |  |  |  |  |  |
Cash equivalents: money-market funds | $ | 17,027 |  |  | $ | 17,027 |  |  | $ | — |  |  | $ | — |
Available-for-sale securities: U.S. treasuries (1) | 123,838 |  |  | 123,838 |  |  | — |  |  | — |
Available-for-sale securities: certificates of deposit (1) | 148 |  |  | 148 |  |  | — |  |  | — |
Trading securities: mutual funds (1) | 1,528 |  |  | 1,528 |  |  | — |  |  | — |
Foreign currency forward contracts (2) | 8,763 |  |  | — |  |  | 8,763 |  |  | — |
Total assets measured at fair value | $ | 151,304 |  |  | $ | 142,541 |  |  | $ | 8,763 |  |  | $ | — |
_________________________
(1) | Included in short-term investments on the Company’s unaudited condensed consolidated balance sheets.
(2) | Included in prepaid expenses and other current assets on the Company’s unaudited condensed consolidated balance sheets.
Fair Value, Liabilities Measured On Recurring Basis |
| As of October 1, 2017
| Total |  | Quoted market prices in active markets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
| (In thousands)
Liabilities: |  |  |  |  |  |  |
Foreign currency forward contracts (3) | $ | 11,749 |  |  | $ | — |  |  | $ | 11,749 |  |  | $ | — |
Total liabilities measured at fair value | $ | 11,749 |  |  | $ | — |  |  | $ | 11,749 |  |  | $ | — |
_________________________
(3) | Included in other accrued liabilities on the Company’s unaudited condensed consolidated balance sheets.
| As of December 31, 2016
| Total |  | Quoted market prices in active markets (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3)
| (In thousands)
Liabilities: |  |  |  |  |  |  |
Foreign currency forward contracts (3) | $ | 1,705 |  |  | $ | — |  |  | $ | 1,705 |  |  | $ | — |
Total liabilities measured at fair value | $ | 1,705 |  |  | $ | — |  |  | $ | 1,705 |  |  | $ | — |
_________________________
(3) | Included in other accrued liabilities on the Company’s unaudited condensed consolidated balance sheets.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&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 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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