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Cash, Cash Equivalents, and Investments (Tables) | 9 Months Ended
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Sep. 29, 2019
Cash and Cash Equivalents [Abstract] |
Components of Cash, Cash Equivalents, and Investments | Cash, cash equivalents, and investments consisted of the following (in thousands):
| September 29, 2019 |  | December 31, 2018
Cash | $ | 105,620 |  |  | $ | 104,655 |
Money market instruments | 16,081 |  |  | 3,557 |
Cash and cash equivalents | 121,701 |  |  | 108,212 |
Treasury bills | 105,454 |  |  | 198,477 |
Asset-backed securities | 89,576 |  |  | 78,407 |
Corporate bonds | 87,209 |  |  | 137,871 |
Sovereign bonds | 6,300 |  |  | 8,101 |
Municipal bonds | 3,533 |  |  | 4,492 |
Current investments | 292,072 |  |  | 427,348 |
Treasury bills | 256,615 |  |  | 32,760 |
Corporate bonds | 167,998 |  |  | 162,566 |
Asset-backed securities | 56,816 |  |  | 53,631 |
Sovereign bonds | 16,000 |  |  | 6,316 |
Agency bonds | 5,905 |  |  | 5,921 |
Municipal bonds | 1,307 |  |  | 845 |
Non-current investments | 504,641 |  |  | 262,039 |
| $ | 918,414 |  |  | $ | 797,599 |
Summary of Available-for-Sale Investments | The following table summarizes the Company’s available-for-sale investments as of September 29, 2019 (in thousands):
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Current: |  |  |  |  |  |  |
Treasury bills | $ | 105,254 |  |  | $ | 212 |  |  | $ | (12 | ) |  | $ | 105,454 |
Asset-backed securities | 89,226 |  |  | 359 |  |  | (9 | ) |  | 89,576 |
Corporate bonds | 86,990 |  |  | 222 |  |  | (3 | ) |  | 87,209 |
Sovereign bonds | 6,286 |  |  | 14 |  |  | — |  |  | 6,300 |
Municipal bonds | 3,535 |  |  | — |  |  | (2 | ) |  | 3,533 |
Non-current: |  |  |  |  |  |  |
Treasury bills | 255,441 |  |  | 1,253 |  |  | (79 | ) |  | 256,615 |
Corporate bonds | 167,464 |  |  | 584 |  |  | (50 | ) |  | 167,998 |
Asset-backed securities | 56,636 |  |  | 195 |  |  | (15 | ) |  | 56,816 |
Sovereign bonds | 15,969 |  |  | 43 |  |  | (12 | ) |  | 16,000 |
Agency bonds | 5,930 |  |  | — |  |  | (25 | ) |  | 5,905 |
Municipal bonds | 1,300 |  |  | 7 |  |  | — |  |  | 1,307 |
| $ | 794,031 |  |  | $ | 2,889 |  |  | $ | (207 | ) |  | $ | 796,713 |
Gross Unrealized Losses and Fair Values for Available-for-Sale Investments | The following table summarizes the Company’s gross unrealized losses and fair values for available-for-sale investments in an unrealized loss position as of September 29, 2019 (in thousands):
| Unrealized Loss Position For: |  |
| Less than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Treasury bills | $ | 108,863 |  |  | $ | (91 | ) |  | $ | — |  |  | $ | — |  |  | $ | 108,863 |  |  | $ | (91 | )
Corporate bonds | 23,263 |  |  | (17 | ) |  | 20,713 |  |  | (36 | ) |  | 43,976 |  |  | (53 | )
Asset-backed securities | 11,149 |  |  | (15 | ) |  | 8,093 |  |  | (9 | ) |  | 19,242 |  |  | (24 | )
Sovereign bonds | 11,558 |  |  | (12 | ) |  | — |  |  | — |  |  | 11,558 |  |  | (12 | )
Agency bonds | 5,905 |  |  | (25 | ) |  | — |  |  | — |  |  | 5,905 |  |  | (25 | )
Municipal bonds | — |  |  | — |  |  | 343 |  |  | (2 | ) |  | 343 |  |  | (2 | )
| $ | 160,738 |  |  | $ | (160 | ) |  | $ | 29,149 |  |  | $ | (47 | ) |  | $ | 189,887 |  |  | $ | (207 | )
Effective Maturity Dates of Available-for-Sale Investments | The following table presents the effective maturity dates of the Company’s available-for-sale investments as of September 29, 2019 (in thousands):
| <1 year |  | 1-2 Years |  | 2-3 Years |  | 3-4 Years |  | 4-5 Years |  | Total
Treasury bills | $ | 105,454 |  |  | $ | 188,398 |  |  | $ | 68,217 |  |  | $ | — |  |  | $ | — |  |  | $ | 362,069 |
Corporate bonds | 87,209 |  |  | 115,941 |  |  | 47,842 |  |  | 1,348 |  |  | 2,867 |  |  | 255,207 |
Asset-backed securities | 89,576 |  |  | 21,425 |  |  | 26,142 |  |  | 7,633 |  |  | 1,616 |  |  | 146,392 |
Sovereign bonds | 6,300 |  |  | 16,000 |  |  | — |  |  | — |  |  | — |  |  | 22,300 |
Agency bonds | — |  |  | — |  |  | 5,905 |  |  | — |  |  | — |  |  | 5,905 |
Municipal bonds | 3,533 |  |  | — |  |  | 1,307 |  |  | — |  |  | — |  |  | 4,840 |
| $ | 292,072 |  |  | $ | 341,764 |  |  | $ | 149,413 |  |  | $ | 8,981 |  |  | $ | 4,483 |  |  | $ | 796,713 |

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