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Fair Value Measurement (Tables) | 6 Months Ended
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Jun. 30, 2021
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | Financial instruments measured and recorded at fair value on a recurring basis as of June 30, 2021 and December 31, 2020 are classified based on the valuation technique level in the tables below (in thousands):
| June 30, 2021
| Total |  | Level 1 |  | Level 2 |  |
Assets: |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |
Money market funds | $ | 807,034 |  |  | $ | 807,034 |  |  | $ | — |  |  |
Short-term investments: |  |  |  |  |  |  |
Commercial paper | 514,835 |  |  | — |  |  | 514,835 |  |  |
Corporate debt securities | 691,309 |  |  | — |  |  | 691,309 |  |  |
Agency bonds | 15,522 |  |  | — |  |  | 15,522 |  |  |
Long-term investments: |  |  |  |  |  |  |
Corporate debt securities | 475,852 |  |  | — |  |  | 475,852 |  |  |
Agency bonds | 9,001 |  |  | — |  |  | 9,001 |  |  |
Total assets measured and recorded at fair value | $ | 2,513,553 |  |  | $ | 807,034 |  |  | $ | 1,706,519 |  |  |
| December 31, 2020
| Total |  | Level 1 |  | Level 2
Assets: |  |  |  |  |
Cash equivalents: |  |  |  |  |
Money market funds | $ | 464,799 |  |  | $ | 464,799 |  |  | $ | — |
Short-term investments: |  |  |  |  |
Commercial paper | 204,170 |  |  | — |  |  | 204,170 |
Corporate debt securities | 461,397 |  |  | — |  |  | 461,397 |
Long-term investments: |  |  |  |  |
Corporate debt securities | 484,597 |  |  | — |  |  | 484,597 |
Agency bonds | 39,031 |  |  | — |  |  | 39,031 |
Total assets measured and recorded at fair value | $ | 1,653,994 |  |  | $ | 464,799 |  |  | $ | 1,189,195 |
Fair Value Measurements, Nonrecurring | The carrying amounts and estimated fair values of the notes as of June 30, 2021 and December 31, 2020 are as follows (in thousands):
| June 30, 2021 |  | December 31, 2020 (1)
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
2026 notes | $ | 986,363 |  |  | $ | 1,050,380 |  |  | $ | 761,930 |  |  | $ | 1,129,370 |
2025 notes | 688,977 |  |  | 1,182,986 |  |  | 640,614 |  |  | 1,456,800 |
2023 notes | — |  |  | — |  |  | 104,378 |  |  | 376,949 |
Convertible senior notes, net | $ | 1,675,340 |  |  | $ | 2,233,366 |  |  | $ | 1,506,922 |  |  | $ | 2,963,119 |
(1) Prior period amounts have not been adjusted due to the adoption of ASU 2020-06 under the modified retrospective method. Refer to Note 7, “Convertible Senior Notes” for more information.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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