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Income Taxes - Net Operating Loss Carry Forward (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items] |
Market capitalization used in net operating loss analysis | $ 124.5
Annual limitation on usage of net operating losses | 3.0
Federal [Member] |
Operating Loss Carryforwards [Line Items] |
Operating loss carryforwards | $ 210.3

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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://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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