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Income Taxes - Net Operating Loss Carry Forward (Details) - USD ($) $ in Millions | 6 Months Ended |
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Jun. 30, 2017 | Dec. 31, 2017
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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