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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Financial Assets Measured on a Recurring Basis

The amounts presented exclude cash, but include investments classified as cash equivalents (in thousands):

	June 30, 2017
	Level 1				Level 2				Total
Money market funds	$	48,253			$	—			$	48,253
Commercial paper	—				303,786				303,786
Corporate bonds	—				550				550
U.S. Treasury and government sponsored enterprises	—				15,636				15,636
Total financial assets	$	48,253			$	319,972			$	368,225

	December 31, 2016
	Level 1				Level 2				Total
Money market funds	$	71,457			$	—			$	71,457
Commercial paper	—				165,375				165,375
Corporate bonds	—				152,407				152,407
U.S. Treasury and government sponsored enterprises	—				70,727				70,727
Total financial assets	$	71,457			$	388,509			$	459,966

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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X

- References

No definition available.

+ Details

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