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Income Taxes - Operating loss carry forwards (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Net operating loss carry forwards |  |
Net operating loss carry forward | $ 6.5 | $ 7.3
Foreign |  |
Net operating loss carry forwards |  |
Net operating loss carry forward | 26.1 |
Net operating loss carryforward, not subject to expiration | 26.1 |
Austria |  |
Net operating loss carry forwards |  |
Net operating loss carry forward | 26.1 |
U.S. |  |
Net operating loss carry forwards |  |
Net operating loss carry forward | $ 0.3 |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68052875&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32632-109319 + Details
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