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Cash and Cash Equivalents, and Investments and Fair Value Measurements | 3 Months Ended
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Mar. 31, 2022
Cash and Cash Equivalents [Abstract] |
Cash and Cash Equivalents, and Investments and Fair Value Measurements | Cash and Cash Equivalents, and Investments and Fair Value Measurements The following tables show our cash and cash equivalents, and investments’ fair value level classification, adjusted cost, unrealized gain, unrealized loss and fair value as of March 31, 2022 and December 31, 2021 (in thousands except for fair value levels):
| March 31, 2022
| Fair Value Level |  | Adjusted Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |  |  |
Cash |  |  | $ | 39,413 |  |  | $ | — |  |  | $ | — |  |  | $ | 39,413 |
Money market funds | Level 1 |  | 228,318 |  |  | — |  |  | — |  |  | 228,318 |
Total cash and cash equivalents |  |  | $ | 267,731 |  |  | $ | — |  |  | $ | — |  |  | $ | 267,731 |
Short-term investments: |  |  |  |  |  |  |  |  |
Commercial paper | Level 2 |  | $ | 86,583 |  |  | $ | — |  |  | $ | (443) |  |  | $ | 86,140 |
Corporate debt securities | Level 2 |  | 765,556 |  |  | 9 |  |  | (6,045) |  |  | 759,520 |
U.S. treasury securities | Level 1 |  | 54,718 |  |  | — |  |  | (436) |  |  | 54,282 |
Agency bonds | Level 2 |  | 15,501 |  |  | — |  |  | (12) |  |  | 15,489 |
Total short-term investments |  |  | $ | 922,358 |  |  | $ | 9 |  |  | $ | (6,936) |  |  | $ | 915,431 |
Long-term investments: |  |  |  |  |  |  |  |  |
Corporate debt securities | Level 2 |  | $ | 346,032 |  |  | $ | — |  |  | $ | (7,939) |  |  | $ | 338,093 |
U.S. treasury securities | Level 1 |  | 99,294 |  |  | — |  |  | (1,974) |  |  | 97,320 |
Total long-term investments |  |  | $ | 445,326 |  |  | $ | — |  |  | $ | (9,913) |  |  | $ | 435,413 |
| December 31, 2021
| Fair Value Level |  | Adjusted Cost |  | Unrealized Gain |  | Unrealized Loss |  | Fair Value
Cash and cash equivalents: |  |  |  |  |  |  |  |  |
Cash |  |  | $ | 30,324 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,324 |
Money market funds | Level 1 |  | 823,754 |  |  | — |  |  | — |  |  | 823,754 |
Total cash and cash equivalents |  |  | $ | 854,078 |  |  | $ | — |  |  | $ | — |  |  | $ | 854,078 |
Short-term investments: |  |  |  |  |  |  |  |  |
Commercial paper | Level 2 |  | $ | 124,211 |  |  | $ | 2 |  |  | $ | (33) |  |  | $ | 124,180 |
Corporate debt securities | Level 2 |  | 552,609 |  |  | 36 |  |  | (546) |  |  | 552,099 |
Agency bonds | Level 2 |  | 15,500 |  |  | 2 |  |  | — |  |  | 15,502 |
Total short-term investments |  |  | $ | 692,320 |  |  | $ | 40 |  |  | $ | (579) |  |  | $ | 691,781 |
Long-term investments: |  |  |  |  |  |  |  |  |
Corporate debt securities | Level 2 |  | $ | 724,517 |  |  | $ | — |  |  | $ | (3,277) |  |  | $ | 721,240 |
U.S. treasury securities | Level 1 |  | 24,860 |  |  | — |  |  | (107) |  |  | 24,753 |
Total long-term investments |  |  | $ | 749,377 |  |  | $ | — |  |  | $ | (3,384) |  |  | $ | 745,993 |
As of March 31, 2022, we determined that the declines in the market value of our investment portfolio were not driven by credit related factors. During the three months ended March 31, 2022 and 2021 we did not recognize any losses on our investments due to credit related factors. During the three months ended March 31, 2022 and 2021, our gross realized gains and losses on investments were not significant. The following table shows our cash equivalents and investments' adjusted cost and fair value by contractual maturity as of March 31, 2022 (in thousands):
| Adjusted Cost |  | Fair Value
Due in 1 year or less | $ | 922,358 |  |  | $ | 915,431 |
Due in 1-2 years | 445,326 |  |  | 435,413 |
Investments not due at a single maturity date | 228,318 |  |  | 228,318 |
Total | $ | 1,596,002 |  |  | $ | 1,579,162 |
Investments not due at a single maturity date in the preceding table consisted of money market funds. Financial Instruments Not Recorded at Fair Value on a Recurring Basis We report our financial instruments at fair value with the exception of the notes. The estimated fair value of the notes was determined based on the trading price of the notes as of the last day of trading for the period. We consider the fair value of the notes to be a Level 2 measurement due to the limited trading activity. The estimated fair value of the 2026 notes as of March 31, 2022 and December 31, 2021 was $818.8 million and $840.0 million, respectively. The estimated fair value of the 2025 notes as of March 31, 2022 and December 31, 2021 was $708.8 million and $682.2 million, respectively. For further information on the notes refer to Note 7, “Convertible Senior Notes.”

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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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