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Cash and Investments (Tables) | 12 Months Ended
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Dec. 31, 2021
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 in the accompanying Consolidated Balance Sheets to the amount reported within the accompanying Consolidated Statements of Cash Flows was as follows (in thousands):
| December 31,
| 2021 |  | 2020
Cash and cash equivalents | $ | 647,169 |  |  | $ | 319,217 |
Restricted cash equivalents included in other long-term assets | 16,722 |  |  | 1,555 |
Cash, cash equivalents, and restricted cash equivalents as reported within the accompanying Consolidated Statements of Cash Flows | $ | 663,891 |  |  | $ | 320,772 |
Reconciliation of Cash, Cash Equivalents, and Restricted Cash | A reconciliation of cash, cash equivalents, and restricted cash equivalents reported in the accompanying Consolidated Balance Sheets to the amount reported within the accompanying Consolidated Statements of Cash Flows was as follows (in thousands):
| December 31,
| 2021 |  | 2020
Cash and cash equivalents | $ | 647,169 |  |  | $ | 319,217 |
Restricted cash equivalents included in other long-term assets | 16,722 |  |  | 1,555 |
Cash, cash equivalents, and restricted cash equivalents as reported within the accompanying Consolidated Statements of Cash Flows | $ | 663,891 |  |  | $ | 320,772 |
Schedule of Investments by Security Type | Cash, cash equivalents, restricted cash equivalents and investments consisted of the following (in thousands):
| December 31, 2021
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Debt securities available-for-sale: |  |  |  |  |  |  |
Commercial paper | $ | 945,801 |  |  | $ | 42 |  |  | $ | (2) |  |  | $ | 945,841 |
Corporate bonds | 541,774 |  |  | 876 |  |  | (1,672) |  |  | 540,978 |
U.S. Treasury and government-sponsored enterprises | 33,965 |  |  | 1 |  |  | (21) |  |  | 33,945 |
Municipal bonds | 12,924 |  |  | 15 |  |  | (35) |  |  | 12,904 |
Total debt securities available-for-sale | 1,534,464 |  |  | 934 |  |  | (1,730) |  |  | 1,533,668 |
Cash | 135,653 |  |  | — |  |  | — |  |  | 135,653 |
Money market funds | 66,531 |  |  | — |  |  | — |  |  | 66,531 |
Certificates of deposit | 119,056 |  |  | — |  |  | — |  |  | 119,056 |
Total cash, cash equivalents, restricted cash equivalents and investments | $ | 1,855,704 |  |  | $ | 934 |  |  | $ | (1,730) |  |  | $ | 1,854,908 |
| 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 |
Schedule of Fair Value and Gross Unrealized Losses of Investments Available-for-Sale in an Unrealized Loss Position | The fair value and gross unrealized losses on debt securities available-for-sale in an unrealized loss position were as follows (in thousands):
| December 31, 2021
| Fair Value |  | Gross Unrealized Losses |  |  |  |  |  |  |  |
Corporate bonds | $ | 385,053 |  |  | $ | (1,672) |  |  |  |  |  |  |  |  |
Commercial paper | 43,290 |  |  | (2) |  |  |  |  |  |  |  |  |
U.S. Treasury and government-sponsored enterprises | 18,962 |  |  | (21) |  |  |  |  |  |  |  |  |
Municipal bonds | 7,475 |  |  | (35) |  |  |  |  |  |  |  |  |
Total | $ | 454,780 |  |  | $ | (1,730) |  |  |  |  |  |  |  |  |
| 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) |  |  |  |  |  |  |  |  |
Schedule of 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):
| December 31,
| 2021 |  | 2020
Maturing in one year or less | $ | 1,168,256 |  |  | $ | 1,034,150 |
Maturing after one year through five years | 365,412 |  |  | 321,751 |
Total debt securities available-for-sale | $ | 1,533,668 |  |  | $ | 1,355,901 |

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