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Discontinued Operations - PCT Segment Narrative (Details) - PCT Segment [Member] - Discontinued Operations [Member] - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended
May 18, 2017
Mar. 31, 2017
Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Ownership interest (percent) 80.10%    
Transaction and retention costs $ 6,919    
Payments to Employees     $ 4,300
Payment for Retention Agreement in Connection with Sale, First Retention Payment, Percent     50.00%
Payment for Retention Agreement in Connection with Sale, Second Retention Payment, Percent     50.00%
Hitachi Chemical Co., LTD [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Purchase agreement, aggregate purchase price 75,000    
Purchase agreement, additional consideration 4,400    
Purchase Agreement, Potential Future Milestone Payment 5,000    
Cumulative Revenue Threshold for Receiving Milestone Payment 125,000    
Proceeds From Licensing Agreements, Initial Payment   $ 5,000  
Proceeds From Licensing Agreements, Closing Payments 65,000    
Proceeds From Licensing Agreements, Escrow Amount $ 5,000