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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 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:
|  | September 30, 2015 |  | December 31, 2014
(in thousands) |  | Level 1 |  | Level 2 |  | Total |  | Level 1 |  | Level 2 |  | Total
Cash equivalents (1): |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 12,173 |  |  | $ | — |  |  | $ | 12,173 |  |  | $ | 80,968 |  |  | $ | — |  |  | $ | 80,968 |
Corporate debt securities |  | — |  |  | 100 |  |  | 100 |  |  | — |  |  | 2,000 |  |  | 2,000 |
Total cash equivalents |  | $ | 12,173 |  |  | $ | 100 |  |  | $ | 12,273 |  |  | $ | 80,968 |  |  | $ | 2,000 |  |  | $ | 82,968 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 3,014 |  |  | $ | — |  |  | $ | 3,014 |  |  | $ | 1,994 |  |  | $ | — |  |  | $ | 1,994 |
U.S. agency securities |  | — |  |  | 19,565 |  |  | 19,565 |  |  | — |  |  | 7,020 |  |  | 7,020 |
Commercial paper |  | — |  |  | 997 |  |  | 997 |  |  | — |  |  | 2,497 |  |  | 2,497 |
Corporate debt securities |  | — |  |  | 197,554 |  |  | 197,554 |  |  | — |  |  | — |  |  | — |
Municipal securities |  | — |  |  | 12,003 |  |  | 12,003 |  |  | — |  |  | 90,816 |  |  | 90,816 |
Total marketable securities |  | $ | 3,014 |  |  | $ | 230,119 |  |  | $ | 233,133 |  |  | $ | 1,994 |  |  | $ | 100,333 |  |  | $ | 102,327 |
(1) Included in “cash and cash equivalents” in the accompanying condensed consolidated balance sheets as of September 30, 2015 and December 31, 2014, in addition to cash of $267.7 million and $237.0 million, respectively.

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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 (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&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=36462937&loc=d3e19190-110258 + Details
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