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Acquisition (Details) - USD ($)
$ in Millions
Jul. 31, 2017
Dec. 24, 2014
SoLayTec, B.V.    
Business Acquisition [Line Items]    
Percentage of voting interests acquired 49.00% 51.00%
Purchase price   $ 1.9
Noncontrolling interest $ 2.7  
Agreement    
Business Acquisition [Line Items]    
Extinguishment of debt $ 2.4