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Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Summary of Fair Value Measurements of Cash Equivalents, and Available-for-Sale Marketable Securities

The fair value measurements of the Company’s cash equivalents and available-for-sale marketable securities are identified at the following levels within the fair value hierarchy (in thousands):

		June 30, 2018
		Fair Value Measurements
		Total				Level 1				Level 2				Level 3
Assets:
Cash equivalents:
Money market funds		$	41,909			$	41,909			$	—			$	—
Commercial paper securities			15,233				—				15,233				—
Total			57,142				41,909				15,233				—
Marketable securities:
Commercial paper securities			396,993				—				396,993				—
Corporate debt securities			98,676				—				98,676				—
U.S. government-sponsored entity debt securities			18,553				—				18,553				—
Total			514,222				—				514,222				—
Total cash equivalents and marketable securities		$	571,364			$	41,909			$	529,455				—

		December 31, 2017
		Fair Value Measurements
		Total				Level 1				Level 2				Level 3
Assets:
Cash equivalents:
Money market funds		$	24,290			$	24,290			$	—			$	—
Commercial paper securities			4,595				—				4,595				—
Total			28,885				24,290				4,595				—
Marketable securities:
Commercial paper securities			110,247				—				110,247				—
Corporate debt securities			75,755				—				75,755				—
U.S. government-sponsored entity debt securities			8,492				—				8,492				—
Total			194,494				—				194,494				—
Total cash equivalents and marketable securities		$	223,379			$	24,290			$	199,089				—

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- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ 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 3
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2C
-URI http://asc.fasb.org/extlink&oid=99377789&loc=SL7498348-110258

Reference 4: 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 5: 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

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- References

No definition available.

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