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Stock-based compensation (Details) - shares | 9 Months Ended |
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Stock based compensation |  |
Shares reserved for future issuance (in shares) | 2,814,716 | 9,445,451
2015 Plan |  |
Stock based compensation |  |
Shares available for grant (in shares) | 1,068,287 |
Shares reserved for future issuance (in shares) | 1,106,685 |
Shares available for future issuance (in shares) | 860,948 |
2015 Plan | Annual minimum increase |  |
Stock based compensation |  |
Shares available for grant (in shares) | 1,297,334 |
Percentage of outstanding Common Stock available for issuance (as a percent) | 4.00% |
2008 Plan |  |
Stock based compensation |  |
Shares available for grant (in shares) | 25,942 |
Shares reserved for future issuance (in shares) | 1,466,274 |
Shares available for future issuance (in shares) | 0 |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock. + References No definition available. + Details
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