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Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value, Assets Measured on Recurring Basis

The Company’s assets that are measured at fair value on a recurring basis, by level, within the fair value hierarchy are summarized as follows:

		March 31, 2015												December 31, 2014
(in thousands)		Level 1				Level 2				Total				Level 1				Level 2				Total
Cash equivalents:
Money market funds		$	16,618			$	—			$	16,618			$	80,968			$	—			$	80,968
Corporate debt securities		—				—				—				—				2,000				2,000
Total cash equivalents		$	16,618			$	—			$	16,618			$	80,968			$	2,000			$	82,968
Marketable securities:
U.S. treasury securities		$	2,498			$	—			$	2,498			$	1,994			$	—			$	1,994
U.S. agency securities		—				15,287				15,287				—				7,020				7,020
Commercial paper		—				3,697				3,697				—				2,497				2,497
Corporate debt securities		—				147,259				147,259				—				90,816				90,816
Total marketable securities		$	2,498			$	166,243			$	168,741			$	1,994			$	100,333			$	102,327

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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 1

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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