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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements of Cash Equivalents and Available-For-Sale Investment Securities

The recurring fair value measurements of the Company’s cash equivalents and available-for-sale investment securities at December 31, 2017 and 2016 consisted of the following (in thousands):

						Fair Value Measurements at Reporting Date Using
		December 31, 2017				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
Money market fund		$	38,057			$	38,057			$	—			$	—
U.S. Treasury notes			32,964				32,964				—				—
Government sponsored enterprise securities			10,072				—				10,072				—
Corporate debt securities			154,396				—				154,396				—
Commercial paper			98,052				—				98,052				—
		$	333,541			$	71,021			$	262,520			$	—

						Fair Value Measurements at Reporting Date Using
		December 31, 2016				Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)
Money market fund		$	129,292			$	129,292			$	—			$	—
U.S. Treasury notes			82,487				82,487				—				—
Government sponsored enterprise securities			88,773				—				88,773				—
Corporate debt securities			82,857				—				82,857				—
Commercial paper			140,024				—				140,024				—
		$	523,433			$	211,779			$	311,654			$	—

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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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