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Cash and Investments in Marketable Securities | 9 Months Ended
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Sep. 30, 2023
Fair Value Disclosures [Abstract] |
Cash and Investments in Marketable Securities | Note 2 — Cash and Investments in Marketable Securities Cash and investments in marketable securities, including cash equivalents, are as follows (in thousands):
|  | Estimated Fair Value at |
|  | September 30, 2023 |  |  | December 31, 2022 |
Cash and cash equivalents |  | $ | 64,921 |  |  | $ | 88,227 |
Short-term investments |  |  | 307,737 |  |  |  | 416,750 |
Total cash and investments in marketable securities |  | $ | 372,658 |  |  | $ | 504,977 |
Our portfolio of cash and investments in marketable securities includes (in thousands):
|  |  |  | September 30, 2023 |  |  | December 31, 2022 |
|  | Fair Value Hierarchy Level |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Fair Value |
Corporate notes and bonds |  | 2 |  | $ | 11,251 |  |  | $ | — |  |  | $ | (20 | ) |  | $ | 11,231 |  |  | $ | 83,522 |
Corporate commercial paper |  | 2 |  |  | 294,184 |  |  |  | — |  |  |  | (229 | ) |  |  | 293,955 |  |  |  | 344,204 |
Available-for-sale investments |  |  |  | $ | 305,435 |  |  | $ | — |  |  | $ | (249 | ) |  | $ | 305,186 |  |  | $ | 427,726 |
Money market funds |  | 1 |  |  |  |  |  |  |  |  |  |  |  | 46,858 |  |  |  | 47,054 |
Certificates of deposit |  | 2 |  |  |  |  |  |  |  |  |  |  |  | 15,186 |  |  |  | 21,399 |
Cash |  | N/A |  |  |  |  |  |  |  |  |  |  |  | 5,428 |  |  |  | 8,798 |
Total cash and investments in marketable securities |  |  |  |  |  |  |  |  | $ | 372,658 |  |  | $ | 504,977 |
For the three and nine months ended September 30, 2023 and 2022, there were no transfers between Level 1 and Level 2 of the fair value hierarchy. At December 31, 2022, our gross unrealized losses totaled $1.8 million, and our gross unrealized gains were insignificant.

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent + Details
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- References No definition available. + Details
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