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Collaboration and Hitachi License Agreement - 2017 Hitachi Transaction (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 18, 2017 | May 31, 2018 | May 31, 2017 | Mar. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018
PCT Segment [Member] | Discontinued Operations [Member] |  |  |  |  |  |
Business Acquisition [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] | PCT Segment [Member] | Discontinued Operations [Member] |  |  |  |  |  |
Business Acquisition [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 |  |  |  |  |
Hitachi Chemical Co., LTD [Member] | PCT Allendale, LLC [Member] | PCT Segment [Member] | Discontinued Operations [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase agreement, aggregate purchase price | $ 75,000 |  |  |  |  |
Director [Member] | Robert A. Preti [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Related Party Transaction, Payment for Retention Agreement in Connection with Sale, First Retention Payment |  |  | $ 1,900 |  |  |
Related Party Transaction, Payment for Retention Agreement in Connection with Sale, Second Retention Payment |  | $ 1,900 |  |  |  |
Related Party Transaction, Payment for Retention Agreement in Connection with Sale, Third Retention Payment, Percentage of Milestone Payment |  |  |  |  |  | 5.00%

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