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The Business Proposed Sale of Remaining Interest in PCT to Hitachi America (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 16, 2017
Mar. 31, 2017
Mar. 11, 2016
Subsidiary, Sale of Stock [Line Items]      
Subsidiary, Ownership Interest by Parent 80.10%   80.10%
Hitachi Chemical Co., LTD [Member]      
Subsidiary, Sale of Stock [Line Items]      
Proceeds From Licensing Agreements, Initial Payment $ 5.0 $ 5.0  
Cumulative Revenue Threshold for Receiving Milestone Payment   125.0  
PCT Allendale, LLC [Member] | Hitachi Chemical Co., LTD [Member]      
Subsidiary, Sale of Stock [Line Items]      
Proceeds From Licensing Agreements 75.0 $ 75.0  
Cumulative Revenue Threshold for Receiving Milestone Payment $ 125.0