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Income Taxes - Tax Credit Carryforwards (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Valuation allowance  
Increase (decrease) in valuation allowance $ 14.5
2017 Tax Act, Increase in deferred tax assets valuation allowance 6.8
Federal | Capital loss carryforward  
Tax credit carryforward  
Tax credit carry forwards 3.5
Federal | Research and development tax credit carryforward  
Tax credit carryforward  
Tax credit carry forwards 28.3
Federal | Research and development tax credit carryforward | Ultratech  
Tax credit carryforward  
Tax credit carry forwards 11.4
State and local  
Tax credit carryforward  
Tax credit carry forwards 27.4
Foreign tax  
Tax credit carryforward  
Tax credit carry forwards $ 9.4