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Cash and Investments in Marketable Securities | 12 Months Ended
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Dec. 31, 2021
Cash and Cash Equivalents [Abstract] |
Cash, Cash Equivalents, and Marketable Securities | Cash and Investments in Marketable Securities Cash and investments in marketable securities, including cash equivalents, are as follows (in thousands):
| Estimated Fair Value at
| December 31, 2021 |  | December 31, 2020
Cash and cash equivalents | $ | 25,218 |  |  | $ | 198,955 |
Short-term investments | 708,737 |  |  | 862,941 |
Long-term investments | 64,828 |  |  | 136,662 |
Total cash and investments in marketable securities | $ | 798,783 |  |  | $ | 1,198,558 |
We invest in liquid, high quality debt securities. Our investments in debt securities are subject to interest rate risk. To minimize the exposure due to an adverse shift in interest rates, we invest in securities with maturities of two years or less and maintain a weighted average maturity of one year or less. All of our long-term investments as of December 31, 2021 and 2020 had maturities between one and two years. During the year ended December 31, 2021 and 2020, we sold available-for-sale securities totaling $11.5 million and $41.7 millions, respectively. We did not sell any available-for-sale securities in the year ended December 31, 2019. Gross realized gains and losses on those sales were not significant. We report our accrued interest receivable, which totaled $1.4 million and $5.1 million at December 31, 2021 and December 31, 2020, respectively, in other current assets on our Consolidated Balance Sheets. Our portfolio of cash and investments in marketable securities includes (in thousands):
| Fair Value Hierarchy Level |  | December 31, 2021 |  | December 31, 2020
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value |  | Fair Value
Corporate notes and bonds | 2 |  | $ | 278,475 |  |  | $ | 7 |  |  | $ | (361) |  |  | $ | 278,121 |  |  | $ | 687,469 |
Corporate commercial paper | 2 |  | 478,932 |  |  | 5 |  |  | (308) |  |  | 478,629 |  |  | 313,497 |
Obligations of U.S. government agencies | 2 |  | 5,880 |  |  | — |  |  | (5) |  |  | 5,875 |  |  | 2,382 |
Available-for-sale investments |  |  | 763,287 |  |  | 12 |  |  | (674) |  |  | 762,625 |  |  | 1,003,348 |
Money market funds | 1 |  |  |  |  |  |  |  | 23,968 |  |  | 179,302 |
Certificates of deposit | 2 |  |  |  |  |  |  |  | 10,940 |  |  | 9,623 |
Cash | N/A |  |  |  |  |  |  |  | 1,250 |  |  | 6,285 |
Total cash and investments in marketable securities |  |  |  |  |  | $ | 798,783 |  |  | $ | 1,198,558 |
At December 31, 2020, our gross unrealized gains and losses totaled $1.1 million and $0.2 million, respectively. At both December 31, 2021 and 2020, we had letter of credit arrangements in favor of our landlords and certain vendors totaling $8.1 million. These letters of credit are secured by investments of similar amounts.

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- Definition The entire disclosure of cash, cash equivalents, and debt and equity securities, including any unrealized or realized gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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