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Cash and Investments | 3 Months Ended
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Apr. 02, 2021
Investments, Debt and Equity Securities [Abstract] |
CASH AND INVESTMENTS | CASH AND INVESTMENTS Cash, Cash Equivalents and Restricted Cash Equivalents A reconciliation of cash, cash equivalents, and restricted cash equivalents reported in the accompanying Condensed Consolidated Balance Sheets to the amount reported within the accompanying Condensed Consolidated Statements of Cash Flows was as follows (in thousands):
| March 31, 2021 |  | December 31, 2020
Cash and cash equivalents | $ | 370,209 |  |  | $ | 319,217 |
Restricted cash equivalents included in other long-term assets | 49,712 |  |  | 1,555 |
Cash, cash equivalents, and restricted cash equivalents as reported in the accompanying Condensed Consolidated Statements of Cash Flows | $ | 419,921 |  |  | $ | 320,772 |
Restricted cash equivalents are used to collateralize letters of credit and consist of money-market funds and certificates of deposit with original maturities of 90 days or less. The restricted cash equivalents are classified as other long-term assets based upon the remaining term of the underlying restriction. As of March 31, 2021, restricted cash equivalents included $48.2 million of short-term investments as collateral under our standby letter of credit entered into in January 2021 as guarantee of our obligation to fund our portion of the total tenant improvements related to our build-to-suit lease at our corporate campus. Cash, Cash Equivalents, Restricted Cash Equivalents and Investments Cash, cash equivalents, restricted cash equivalents and investments consisted of the following (in thousands):
| March 31, 2021
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt securities available-for-sale: |  |  |  |  |  |  |
Commercial paper | $ | 667,071 |  |  | $ | 219 |  |  | $ | (1) |  |  | $ | 667,289 |
Corporate bonds | 495,490 |  |  | 3,609 |  |  | (275) |  |  | 498,824 |
U.S. Treasury and government-sponsored enterprises | 148,208 |  |  | 83 |  |  | (7) |  |  | 148,284 |
Municipal bonds | 27,776 |  |  | 64 |  |  | (8) |  |  | 27,832 |
Total debt securities available-for-sale | 1,338,545 |  |  | 3,975 |  |  | (291) |  |  | 1,342,229 |
Cash | 52,757 |  |  | — |  |  | — |  |  | 52,757 |
Money market funds | 105,775 |  |  | — |  |  | — |  |  | 105,775 |
Certificates of deposit | 63,305 |  |  | — |  |  | — |  |  | 63,305 |
Total cash, cash equivalents, restricted cash equivalents and investments | $ | 1,560,382 |  |  | $ | 3,975 |  |  | $ | (291) |  |  | $ | 1,564,066 |
| December 31, 2020
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt securities available-for-sale: |  |  |  |  |  |  |
Commercial paper | $ | 569,456 |  |  | $ | 372 |  |  | $ | — |  |  | $ | 569,828 |
Corporate bonds | 543,520 |  |  | 5,244 |  |  | (7) |  |  | 548,757 |
U.S. Treasury and government-sponsored enterprises | 208,326 |  |  | 232 |  |  | (4) |  |  | 208,554 |
Municipal bonds | 28,680 |  |  | 83 |  |  | (1) |  |  | 28,762 |
Total debt securities available-for-sale | 1,349,982 |  |  | 5,931 |  |  | (12) |  |  | 1,355,901 |
Cash | 82,176 |  |  | — |  |  | — |  |  | 82,176 |
Money market funds | 40,761 |  |  | — |  |  | — |  |  | 40,761 |
Certificates of deposit | 60,004 |  |  | — |  |  | — |  |  | 60,004 |
Total cash, cash equivalents, restricted cash equivalents and investments | $ | 1,532,923 |  |  | $ | 5,931 |  |  | $ | (12) |  |  | $ | 1,538,842 |
Interest receivable was $3.6 million and $4.5 million as of March 31, 2021 and December 31, 2020, respectively, and is included in prepaid expenses and other current assets in the accompanying Condensed Consolidated Balance Sheets. Realized gains and losses on the sales of investments were insignificant during the three months ended March 31, 2021 and 2020. We manage credit risk associated with our investment portfolio through our investment policy, which limits purchases to high-quality issuers and limits the amount of our portfolio that can be invested in a single issuer. The fair value and gross unrealized losses on debt securities available-for-sale in an unrealized loss position were as follows (in thousands):
|  |  |  |  |  |  |  |  | March 31, 2021
|  |  |  |  |  |  |  |  | Fair Value |  | Gross Unrealized Losses
Commercial paper |  |  |  |  |  |  |  |  | $ | 4,722 |  |  | $ | (1) |
Corporate bonds |  |  |  |  |  |  |  |  | 131,468 |  |  | (275) |
U.S. Treasury and government-sponsored enterprises |  |  |  |  |  |  |  |  | 31,981 |  |  | (7) |
Municipal bonds |  |  |  |  |  |  |  |  | 12,120 |  |  | (8) |
Total |  |  |  |  |  |  |  |  | $ | 180,291 |  |  | $ | (291) |
|  |  |  |  |  |  |  |  | December 31, 2020
|  |  |  |  |  |  |  |  | Fair Value |  | Gross Unrealized Losses
Corporate bonds |  |  |  |  |  |  |  |  | $ | 28,445 |  |  | $ | (7) |
U.S. Treasury and government-sponsored enterprises |  |  |  |  |  |  |  |  | 21,989 |  |  | (4) |
Municipal bonds |  |  |  |  |  |  |  |  | 5,865 |  |  | (1) |
Total |  |  |  |  |  |  |  |  | $ | 56,299 |  |  | $ | (12) |
All securities presented have been in an unrealized loss position for less than 12 months. There were 53 and 14 investments in an unrealized loss position as of March 31, 2021 and December 31, 2020, respectively. During the three months ended March 31, 2021 and 2020, we did not record an allowance for credit losses or other impairment charges on our investment securities. Based upon our quarterly impairment review, we determined that the unrealized losses were not attributed to credit risk but were primarily associated with changes in interest rates and market liquidity. Based on the scheduled maturities of our investments, we determined that it was more likely than not that we will hold these investments for a period of time sufficient for a recovery of our cost basis. The fair value of debt securities available-for-sale by contractual maturity was as follows (in thousands):
| March 31, 2021 |  | December 31, 2020
Maturing in one year or less | $ | 1,021,369 |  |  | $ | 1,034,150 |
Maturing after one year through five years | 320,860 |  |  | 321,751 |
Total debt securities available-for-sale | $ | 1,342,229 |  |  | $ | 1,355,901 |

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- Definition The entire disclosure for cash, cash equivalents, investments in debt and equity instruments (including cost and equity investees and related income statement amounts), equity and cost method investments, investments in joint ventures and any other investment. + References No definition available. + Details
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