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Income taxes (Credit Carryforwards Narrative) (Details) - R&D Tax Credit $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Tax Credit Carryforward, Description | At December 31, 2017, we have net operating loss carryforwards of approximately $391.5 million for federal income tax reporting purposes. In addition, we have research and development tax credits of $7.4 million.
Tax Credit Carryforward, Amount | $ 7,400
Tax Credit Carryforward, Expiration Date | Dec. 31, 2018

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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=84230637&loc=d3e32559-109319 + 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 -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84230637&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=84230637&loc=d3e32559-109319 + Details
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