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Income taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Taxes Narrative Details |  |
Provision for income taxes | $ 0.0 | $ 0.0
Operating Loss Carryforwards | $ 398.1 |
Operating loss carryforwards, expiration date | Dec. 31, 2019 |
Annual limit on operating loss carryforwards | <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0">In certain circumstances, as specified in the Internal Revenue Code, a 50% or more ownership change by certain combinations of our shareholders during any three year period would result in limitations on our ability to use a portion of our net operating loss carryforwards.</p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"></p> <p style="font: 10pt Times New Roman, Times, Serif; margin-right: 0; margin-left: 0"> </p> |
Accrued penalties and interest | $ 0.0 |
Unrecognized tax benefits | $ 0.0 |
Tax years open for examination | 1998 |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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