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Discontinued Operations - PCT Segment Narrative (Details) - PCT Segment [Member] - Discontinued Operations [Member] - USD ($)
$ in Thousands
 1 Months Ended
May 18, 2018
May 18, 2017
May 31, 2018
Jul. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Subsidiary, Ownership Interest by Parent   80.10%        
Transaction Costs Related to Sale   $ 6,919        
Payments to Employees   4,300        
Retention Payments, First Retention Payment, Percent         50.00%  
Retention Payments, Second Retention Payment, Percent 50.00%   50.00%      
Hitachi Chemical Co., LTD [Member]            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
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   $ 4,400    
Proceeds From Licensing Agreements, Escrow Amount   5,000        
PCT Allendale, LLC [Member] | 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