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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Disclosures [Abstract] |
Financial Instruments Measured and Recorded at Fair Value on Recurring Basis | Financial instruments measured and recorded at fair value on a recurring basis as of December 31, 2019 and 2018 are classified based on the valuation technique level in the tables below (in thousands):
| December 31, 2019
| Total |  | Level 1 |  | Level 2
Assets: |  |  |  |  |
Cash equivalents: |  |  |  |  |
Money market funds | $ | 146,165 |  |  | $ | 146,165 |  |  | $ | — |
Short-term investments: |  |  |  |  |
Commercial paper | 7,489 |  |  | — |  |  | 7,489 |
Corporate securities | 319,293 |  |  | — |  |  | 319,293 |
U.S. treasury securities | 44,286 |  |  | 44,286 |  |  | — |
Agency bonds | 10,006 |  |  | — |  |  | 10,006 |
Long-term investments: |  |  |  |  |
Corporate securities | 295,478 |  |  | — |  |  | 295,478 |
Agency bonds | 15,005 |  |  | — |  |  | 15,005 |
Total assets measured and recorded at fair value | $ | 837,722 |  |  | $ | 190,451 |  |  | $ | 647,271 |
| December 31, 2018
| Total |  | Level 1 |  | Level 2
Assets: |  |  |  |  |
Cash equivalents: |  |  |  |  |
Money market funds | $ | 5,052 |  |  | $ | 5,052 |  |  | $ | — |
Commercial paper | 18,267 |  |  | — |  |  | 18,267 |
Short-term investments: |  |  |  |  |
Commercial paper | 40,488 |  |  | — |  |  | 40,488 |
Corporate securities | 38,529 |  |  | — |  |  | 38,529 |
U.S. treasury securities | 14,328 |  |  | 14,328 |  |  | — |
Long-term investments: |  |  |  |  |
Corporate securities | 14,424 |  |  | — |  |  | 14,424 |
U.S treasury securities | 1,628 |  |  | 1,628 |  |  | — |
Total assets measured and recorded at fair value | $ | 132,716 |  |  | $ | 21,008 |  |  | $ | 111,708 |
Fair Value Measurements, Nonrecurring | The carrying amounts and estimated fair values of the notes as of December 31, 2019 and 2018 are as follows (in thousands):
| December 31, 2019 |  | December 31, 2018
| Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
2025 notes | $ | 602,611 |  |  | $ | 831,000 |  |  | $ | — |  |  | $ | — |
2023 notes | 297,692 |  |  | 523,538 |  |  | 283,668 |  |  | 416,156 |
Convertible senior notes, net | $ | 900,303 |  |  | $ | 1,354,538 |  |  | $ | 283,668 |  |  | $ | 416,156 |

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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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