Stock incentive plans (Details 3) (Options)	12 Months Ended
Dec. 31, 2014
Options
Stock incentive plans
Vesting period	4 years
Vesting percentage when the individual completes 12 months of continuous service	25.00%
Continuous service period of individual	12 months
Vesting percentage on a monthly basis	75.00%

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:durationItemType
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Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Represents the continuous service period of an individual that is required for vesting a specified percentage of awards.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Represents the vesting rights percentage on a monthly basis under the compensation plan.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Represents the vesting rights percentage when the individual completes a specified period of continuous service under the compensation plan.

+ References

No definition available.

+ Details

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