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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 2016
Fair Value Disclosures [Abstract] |
Assets measured at fair value on a recurring basis | The Company’s assets that are measured at fair value on a recurring basis within the fair value hierarchy are summarized as follows:
| September 30, 2016 |  | December 31, 2015
(in thousands) | Level 1 |  | Level 2 |  | Total |  | Level 1 |  | Level 2 |  | Total
Cash equivalents (1): |  |  |  |  |  |  |  |  |  |  |
Money market funds | $ | 4,954 |  |  | $ | — |  |  | $ | 4,954 |  |  | $ | 51,059 |  |  | $ | — |  |  | $ | 51,059 |
Total cash equivalents | $ | 4,954 |  |  | $ | — |  |  | $ | 4,954 |  |  | $ | 51,059 |  |  | $ | — |  |  | $ | 51,059 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities | $ | — |  |  | $ | 13,334 |  |  | $ | 13,334 |  |  | $ | — |  |  | $ | 14,451 |  |  | $ | 14,451 |
Commercial paper | — |  |  | — |  |  | — |  |  | — |  |  | 2,197 |  |  | 2,197 |
Corporate debt securities | — |  |  | 77,621 |  |  | 77,621 |  |  | — |  |  | 165,825 |  |  | 165,825 |
Municipal securities | — |  |  | 2,360 |  |  | 2,360 |  |  | — |  |  | 11,913 |  |  | 11,913 |
Total marketable securities | $ | — |  |  | $ | 93,315 |  |  | $ | 93,315 |  |  | $ | — |  |  | $ | 194,386 |  |  | $ | 194,386 |
(1) Included in “cash and cash equivalents” in the accompanying condensed consolidated balance sheets. Cash balances were $126.6 million and $228.6 million as of September 30, 2016 and December 31, 2015, respectively.
Available-for-sale Securities | The remaining contractual maturities of available-for-sale marketable securities are as follows:
(in thousands) | September 30, 2016 |  | December 31, 2015
Less than one year | $ | 93,315 |  |  | $ | 122,199 |
Greater than one year but less than two years | — |  |  | 72,187 |
Total | $ | 93,315 |  |  | $ | 194,386 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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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 + Details
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