Income taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012
Income Taxes Narrative Details
Provision for income taxes	$ 0	$ 0
Operating Loss Carryforwards	326.0
Operating loss carryforwards, expiration dates	Will expire in varying amounts from 2017 to 2033
U.S. Federal Research Tax Credit Carryforwards	6.3
U.S. Federal Research Tax Credit Carryforwards, Expiration Dates	Will expire in varying amounts from 2018 to 2033
Annual limit on operating loss carryforwards	n 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	0	0
Unrecognized tax benefits	$ 0	$ 0
Tax years open for examination	We file income tax returns in the U.S. federal jurisdiction and various states. Due to our operating loss and credit carry-forwards, the U.S. federal statute of limitations remains open for 1997 and onward.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Name Accounting Standards Codification

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Identification, by major jurisdiction, of tax years that remain open to examination under enacted tax laws.

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

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The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates.

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A description of the limitations on the use of all operating loss carryforwards available to reduce future taxable income.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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State the expiration dates of the tax credit carryforward.

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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