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Cash and Investments (Tables) | 3 Months Ended
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Apr. 03, 2020
Investments, Debt and Equity Securities [Abstract] |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash | A reconciliation of cash, cash equivalents, and restricted cash equivalents reported within our Condensed Consolidated Balance Sheets to the amount reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):
| March 31, 2020 |  | December 31, 2019
Cash and cash equivalents | $ | 357,340 |  |  | $ | 266,501 |
Restricted cash equivalents included in long-term investments | 1,636 |  |  | 1,636 |
Cash, cash equivalents, and restricted cash equivalents as reported within the accompanying Condensed Consolidated Statements of Cash Flows | $ | 358,976 |  |  | $ | 268,137 |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash | A reconciliation of cash, cash equivalents, and restricted cash equivalents reported within our Condensed Consolidated Balance Sheets to the amount reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):
| March 31, 2020 |  | December 31, 2019
Cash and cash equivalents | $ | 357,340 |  |  | $ | 266,501 |
Restricted cash equivalents included in long-term investments | 1,636 |  |  | 1,636 |
Cash, cash equivalents, and restricted cash equivalents as reported within the accompanying Condensed Consolidated Statements of Cash Flows | $ | 358,976 |  |  | $ | 268,137 |
Investments by Security Type | Cash and investments consisted of the following (in thousands):
| March 31, 2020
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt securities available-for-sale: |  |  |  |  |  |  |
Commercial paper | $ | 202,452 |  |  | $ | — |  |  | $ | — |  |  | $ | 202,452 |
Corporate bonds | 741,315 |  |  | 2,404 |  |  | (3,448 | ) |  | 740,271 |
U.S. Treasury and government-sponsored enterprises | 152,922 |  |  | 788 |  |  | — |  |  | 153,710 |
Municipal bonds | 15,148 |  |  | 140 |  |  | — |  |  | 15,288 |
Total debt securities available-for-sale | 1,111,837 |  |  | 3,332 |  |  | (3,448 | ) |  | 1,111,721 |
Cash | 8,905 |  |  | — |  |  | — |  |  | 8,905 |
Money market funds | 273,497 |  |  | — |  |  | — |  |  | 273,497 |
Certificates of deposit | 46,279 |  |  | 2 |  |  | — |  |  | 46,281 |
Total cash and investments | $ | 1,440,518 |  |  | $ | 3,334 |  |  | $ | (3,448 | ) |  | $ | 1,440,404 |
| December 31, 2019
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt securities available-for-sale: |  |  |  |  |  |  |
Commercial paper | $ | 389,573 |  |  | $ | — |  |  | $ | — |  |  | $ | 389,573 |
Corporate bonds | 752,295 |  |  | 3,934 |  |  | (3 | ) |  | 756,226 |
U.S. Treasury and government-sponsored enterprises | 166,483 |  |  | 187 |  |  | (5 | ) |  | 166,665 |
Total debt securities available-for-sale | 1,308,351 |  |  | 4,121 |  |  | (8 | ) |  | 1,312,464 |
Cash | 40,964 |  |  | — |  |  | — |  |  | 40,964 |
Money market funds | 2,467 |  |  | — |  |  | — |  |  | 2,467 |
Certificates of deposit | 32,728 |  |  | 5 |  |  | — |  |  | 32,733 |
Total cash and investments | $ | 1,384,510 |  |  | $ | 4,126 |  |  | $ | (8 | ) |  | $ | 1,388,628 |
Fair Value and Gross Unrealized Losses of Investments Available-for-Sale in an Unrealized Loss Position | The fair value and gross unrealized losses on investment securities available-for-sale in an unrealized loss position were as follows (in thousands):
| March 31, 2020
| Fair Value |  | Gross Unrealized Losses
Corporate bonds | $ | 351,135 |  |  | $ | (3,448 | )
Total | $ | 351,135 |  |  | $ | (3,448 | )
| December 31, 2019
| Fair Value |  | Gross Unrealized Losses
Corporate bonds | $ | 14,529 |  |  | $ | (3 | )
U.S. Treasury and government-sponsored enterprises | 2,848 |  |  | (5 | )
Total | $ | 17,377 |  |  | $ | (8 | )
Fair Value of Cash Equivalents and Investments by Contractual Maturity | The fair value of debt securities available-for-sale by contractual maturity was as follows (in thousands):
| March 31, 2020 |  | December 31, 2019
Maturing in one year or less | $ | 641,070 |  |  | $ | 789,913 |
Maturing after one year through five years | 470,651 |  |  | 522,551 |
Total debt securities available-for-sale | $ | 1,111,721 |  |  | $ | 1,312,464 |

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