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Income taxes (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Taxes Narrative Details    
Provision for income taxes $ 0us-gaap_IncomeTaxExpenseBenefit $ 0us-gaap_IncomeTaxExpenseBenefit
Operating Loss Carryforwards 341.5us-gaap_OperatingLossCarryforwards  
Operating loss carryforwards, expiration date Dec. 31, 2018  
Annual limit on operating loss carryforwards

In certain circumstances, as specified in the Internal Revenue Code, a 50% or more ownership change by certain combinations of our stockholders during any three-year period would result in limitations on our ability to utilize our net operating loss carry-forwards.

 

 

 

 

  
Accrued penalties and interest 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized tax benefits $ 0us-gaap_UnrecognizedTaxBenefits $ 0us-gaap_UnrecognizedTaxBenefits
Tax years open for examination 1998  
Operating loss carryforwards, expiration dates

The net operating loss carry-forwards and research and development credits available to offset future taxable income, if any, will expire in varying amounts from 2018 to 2034 if not previously utilized.