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Income taxes (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Income taxes
Change in valuation allowance	$ 9.2us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount	$ 25.6us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Federal
Operating loss carryforwards
Net operating loss carryforwards	226.3us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember
State
Operating loss carryforwards
Net operating loss carryforwards	$ 154.6us-gaap_OperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_StateAndLocalJurisdictionMember

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 45

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32123-109318

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