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Income Taxes - Operating Loss Carryforwards (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($)
Operating loss carryforwards disclosures |
Increase (Decrease) in valuation allowance | $ (6.1)
Ultratech acquisition |
Operating loss carryforwards disclosures |
Net operating loss carryforwards | 119.0
Capital losses |
Operating loss carryforwards disclosures |
Net operating loss carryforwards | 3.5
Research and development tax credit carryforward |
Operating loss carryforwards disclosures |
Tax credit carry forwards | 10.9
Federal |
Operating loss carryforwards disclosures |
Net operating loss carryforwards | 301.6
Federal | Research and development tax credit carryforward |
Operating loss carryforwards disclosures |
Tax credit carry forwards | 16.7
State and local |
Operating loss carryforwards disclosures |
Net operating loss carryforwards | 127.4
Tax credit carry forwards | 27.1
Net deferred tax asset | $ 7.6

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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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