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Income taxes (Credit Carryforwards Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Tax credit 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.
R&D Tax Credit |
Tax Credit Carryforward, Description | Research and development credits available to offset future taxable income.
Tax Credit Carryforward, Amount | 6.5us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ResearchMember
Tax Credit Carryforward, Expiration Date | Dec. 31, 2018
Tax credit 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.
Capital Loss Carryforward |
Tax Credit Carryforward, Description | Capital loss carry-forwards that are scheduled to expire between 2015 and 2017.
Tax Credit Carryforward, Amount | 1.2us-gaap_TaxCreditCarryforwardAmount / us-gaap_TaxCreditCarryforwardAxis = us-gaap_CapitalLossCarryforwardMember
Tax Credit Carryforward, Expiration Date | Dec. 31, 2015
Tax credit carryforwards, expiration dates | In addition to the tax benefits above, we have $1.2 million of capital loss carry-forwards that are scheduled to expire between 2015 and 2017.

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- Definition The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates. + References No definition available. + Details
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- Definition The amount of the tax credit 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 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 + Details
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- Definition A description of the origin, nature, and characteristics of the tax credit carryforward. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Carryforwards -URI http://asc.fasb.org/extlink&oid=6506874 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Expiration date of the tax credit carryforward, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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