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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

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 March 31, 2021 and December 31, 2020 that are measured at fair value on a recurring basis during the period:

	March 31, 2021
	Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Total Estimated Fair Value
	(in thousands)
Cash	$	930,155			$	—			$	—			$	930,155
Level 1 securities:
U.S. government securities		1,002,193				193				—				1,002,386
U.S. government agency securities		123,354				6				(6	)			123,354
Level 2 securities:
Corporate debt securities		68,483				3				(12	)			68,474
Commercial paper		397,233				—				—				397,233
Certificates of deposit		35,095				—				—				35,095
Total	$	2,556,513			$	202			$	(18	)		$	2,556,697

	December 31, 2020
	Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Total Estimated Fair Value
	(in thousands)
Cash	$	464,006			$	—			$	—			$	464,006
Level 1 securities:
U.S. government securities		1,272,125				122				(21	)			1,272,226
U.S. government agency securities		245,055				8				(24	)			245,039
Level 2 securities:
Corporate debt securities		81,158				1				(18	)			81,141
Commercial paper		425,861				—				—				425,861
Certificates of deposit		49,267				—				—				49,267
Total	$	2,537,472			$	131			$	(63	)		$	2,537,540

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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_
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