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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards |  |
Foreign pre-tax loss | $ 8.2 | $ 3.7
Federal |  |
Operating Loss Carryforwards |  |
Net operating loss carryforwards | 561.8 |
Federal | R&D credit |  |
Operating Loss Carryforwards |  |
Tax credit carryforwards | 29.0 |
State |  |
Operating Loss Carryforwards |  |
Net operating loss carryforwards | 435.9 |
State | R&D credit |  |
Operating Loss Carryforwards |  |
Tax credit carryforwards | $ 9.5 |

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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=65882285&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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