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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Summary of Financial Assets Measured at Fair Value on Recurring Basis

The following tables set forth our financial assets as of June 30, 2020 and December 31, 2019 that are measured at fair value on a recurring basis during the period:

	June 30, 2020
	Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Total Estimated Fair Value
	(in thousands)
Cash	$	1,189,011			$	—			$	—			$	1,189,011
Level 1 securities:
U.S. government securities		1,263,863				1,735				(46	)			1,265,552
U.S. government agency securities		339,231				111				(63	)			339,279
Level 2 securities:
Corporate debt securities		22,407				14				—				22,421
Commercial paper		8,389				—				—				8,389
Certificates of deposit		4,917				—				—				4,917
Total	$	2,827,818			$	1,860			$	(109	)		$	2,829,569

	December 31, 2019
	Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Total Estimated Fair Value
	(in thousands)
Cash	$	416,099			$	—			$	—			$	416,099
Level 1 securities:
U.S. government securities		1,305,145				604				(49	)			1,305,700
U.S. government agency securities		269,278				48				(32	)			269,294
Level 2 securities:
Corporate debt securities		28,420				13				(4	)			28,429
Commercial paper		84,498				—				—				84,498
Certificates of deposit		8,785				—				—				8,785
Total	$	2,112,225			$	665			$	(85	)		$	2,112,805

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://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 (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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