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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] |  |  |
Subsidiary, Ownership Interest by Parent | 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, 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 |  |

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