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Fair Value Measurement (Tables)

6 Months Ended

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

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X

- 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

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