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Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2019

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, 2019 and December 31, 2018 that are measured at fair value on a recurring basis during the period:

	March 31, 2019
	Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Total Estimated Fair Value
	(in thousands)
Cash	$	210,507			$	—			$	—			$	210,507
Level 1 securities:
U.S. government securities		728,749				208				(27	)			728,930
U.S. government agency securities		167,044				15				(31	)			167,028
Level 2 securities:
Corporate debt securities		28,931				31				—				28,962
Commercial paper		46,215				—				—				46,215
Certificates of deposit		27,090				—				—				27,090
Total	$	1,208,536			$	254			$	(58	)		$	1,208,732

	December 31, 2018
	Cost or Amortized Cost				Gross Unrealized Gains				Gross Unrealized Losses				Total Estimated Fair Value
	(in thousands)
Cash	$	279,950			$	—			$	—			$	279,950
Level 1 securities:
U.S. government securities		735,988				12				(175	)			735,825
U.S. government agency securities		181,032				4				(36	)			181,000
Level 2 securities:
Corporate debt securities		35,819				1				(18	)			35,802
Commercial paper		33,193				—				—				33,193
Certificates of deposit		13,293				—				—				13,293
Total	$	1,279,275			$	17			$	(229	)		$	1,279,063

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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=99377789&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 1
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258

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=99377789&loc=d3e19207-110258

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X

- References

No definition available.

+ Details

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