Stock incentive plans (Details) - 2011 Plan	9 Months Ended
Sep. 30, 2015 shares
Stock incentive plans
Annual percentage increase alternative, increase in common stock reserved for issuance as a percentage of common stock outstanding	4.50%
Annual fixed increase alternative, increase in shares of common stock reserved for issuance (in shares)	3,000,000
Common stock shares reserved for issuance	10,324,899

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No definition available.

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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

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- Definition

Under the fixed increase alternative, represents the potential annual increase in shares of common stock reserved for issuance as share-based compensation.

+ References

No definition available.

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- Definition

Under the automatic percentage increase alternative, represents the potential annual increase in common stock reserved for issuance as share-based compensation, expressed as a percentage of common stock outstanding at the beginning of each fiscal year.

+ References

No definition available.

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