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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 30, 2018
Fair Value Disclosures [Abstract] |
Classification of Financial Assets Measured and Recorded at Fair Value on a Recurring Basis | The classification of our financial assets within the fair value hierarchy that were measured and recorded at fair value on a recurring basis was as follows; the amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):
| March 31, 2018
| Level 1 |  | Level 2 |  | Total
Money market funds | $ | 55,241 |  |  | $ | — |  |  | $ | 55,241 |
Commercial paper | — |  |  | 237,067 |  |  | 237,067 |
Corporate bonds | — |  |  | 190,531 |  |  | 190,531 |
U.S. Treasury and government sponsored enterprises | — |  |  | 21,433 |  |  | 21,433 |
Total financial assets | $ | 55,241 |  |  | $ | 449,031 |  |  | $ | 504,272 |
| December 31, 2017
| Level 1 |  | Level 2 |  | Total
Money market funds | $ | 45,478 |  |  | $ | — |  |  | $ | 45,478 |
Commercial paper | — |  |  | 199,647 |  |  | 199,647 |
Corporate bonds | — |  |  | 179,022 |  |  | 179,022 |
U.S. Treasury and government sponsored enterprises | — |  |  | 16,263 |  |  | 16,263 |
Total financial assets | $ | 45,478 |  |  | $ | 394,932 |  |  | $ | 440,410 |

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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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